{"id":24988,"date":"2026-10-27T08:21:33","date_gmt":"2026-10-27T08:21:33","guid":{"rendered":"https:\/\/www.mechstream.com\/?p=24988"},"modified":"2026-10-27T08:21:35","modified_gmt":"2026-10-27T08:21:35","slug":"material-temperature-resistance-rating-calculator","status":"publish","type":"post","link":"https:\/\/www.mechstream.com\/ar\/material-temperature-resistance-rating-calculator\/","title":{"rendered":"Material Temperature Resistance Rating Calculator"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">The <strong>Material Temperature Resistance Rating Calculator<\/strong> is a practical online tool designed to help engineers, manufacturers, and material specialists evaluate the temperature resistance of different materials. By entering operating temperatures, material types, and maximum allowable temperature limits, users can calculate temperature safety margins and assess material suitability for specific applications. This free calculator supports various metals, plastics, rubber, ceramics, and composites, providing convenient temperature conversions and material comparisons. It is ideal for material selection, metal fabrication, heat treatment, industrial manufacturing, and high-temperature engineering applications.<\/p>\n\n\n\n<!-- Material Temperature Resistance Rating Calculator - WordPress Custom HTML block \/ Elementor HTML widget snippet. All CSS is scoped to #mtrc-calculator (prefix \"mtrc-\"). 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.mtrc-row{grid-template-columns:minmax(0,1fr) 92px}}\n@media (prefers-reduced-motion:reduce){#mtrc-calculator *{transition:none!important}}\n@media print{#mtrc-calculator .mtrc-actions,#mtrc-calculator .mtrc-toast{display:none!important}}\n<\/style>\n<div class=\"mtrc-layout\">\n<form class=\"mtrc-card mtrc-form\" id=\"mtrc-form\" novalidate onsubmit=\"return false;\" aria-label=\"Calculator inputs\">\n<fieldset class=\"mtrc-fs\"><legend class=\"mtrc-legend\"><span class=\"mtrc-ico\" aria-hidden=\"true\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"#0b4f9c\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M12 2l9 5-9 5-9-5 9-5z\"\/><path d=\"M3 12l9 5 9-5\"\/><path d=\"M3 17l9 5 9-5\"\/><\/svg><\/span>Material Information<\/legend><div class=\"mtrc-grid\"><div class=\"mtrc-field\"><label class=\"mtrc-label\" for=\"mtrc-cat\">Material category<\/label><select id=\"mtrc-cat\"><\/select><\/div><div class=\"mtrc-field\"><label class=\"mtrc-label\" for=\"mtrc-search\">Search materials<\/label><input id=\"mtrc-search\" type=\"search\" placeholder=\"e.g. 316, PEEK, Inconel\" autocomplete=\"off\"><\/div><div class=\"mtrc-field mtrc-span\"><label class=\"mtrc-label\" for=\"mtrc-mat\">Material name<\/label><select id=\"mtrc-mat\"><\/select><\/div><div class=\"mtrc-field mtrc-span\" id=\"mtrc-custom-wrap\" hidden><label class=\"mtrc-label\" for=\"mtrc-custom\">Custom material name<\/label><input id=\"mtrc-custom\" type=\"text\" maxlength=\"120\" placeholder=\"Enter the material name from your datasheet\"><\/div><div class=\"mtrc-field mtrc-span\"><label class=\"mtrc-label\" for=\"mtrc-grade\">Material grade \/ condition <span class=\"mtrc-opt\">(optional)<\/span><\/label><input id=\"mtrc-grade\" type=\"text\" maxlength=\"120\" placeholder=\"e.g. 304L annealed plate, PEEK 450G, 6061-T6\"><\/div><\/div><\/fieldset>\n<fieldset class=\"mtrc-fs\"><legend class=\"mtrc-legend\"><span class=\"mtrc-ico\" aria-hidden=\"true\"><svg viewBox=\"0 0 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id=\"mtrc-max\" type=\"number\" inputmode=\"decimal\" step=\"any\" placeholder=\"From verified datasheet\" aria-describedby=\"mtrc-max-err\"><span class=\"mtrc-error\" id=\"mtrc-max-err\" role=\"alert\"><\/span><\/div><div class=\"mtrc-field\"><label class=\"mtrc-label\" for=\"mtrc-min\">Minimum allowable temperature <span class=\"mtrc-opt\">(optional)<\/span><\/label><input id=\"mtrc-min\" type=\"number\" inputmode=\"decimal\" step=\"any\" placeholder=\"Optional\" aria-describedby=\"mtrc-min-err\"><span class=\"mtrc-error\" id=\"mtrc-min-err\" role=\"alert\"><\/span><\/div><div class=\"mtrc-field mtrc-span\"><label class=\"mtrc-check\" for=\"mtrc-confirm\"><input id=\"mtrc-confirm\" type=\"checkbox\"><span>I have confirmed that the entered limits apply to the selected exposure type, operating environment and load condition (e.g. from the manufacturer&#8217;s datasheet or the applicable design code).<\/span><\/label><\/div><div class=\"mtrc-field mtrc-span\"><label class=\"mtrc-label\" for=\"mtrc-alert\">&#8220;Approaching limit&#8221; visual alert threshold <span class=\"mtrc-badge mtrc-b-user\">User-defined<\/span><\/label><input id=\"mtrc-alert\" type=\"number\" inputmode=\"decimal\" step=\"any\" min=\"0\" aria-describedby=\"mtrc-alert-err\"><span class=\"mtrc-error\" id=\"mtrc-alert-err\" role=\"alert\"><\/span><\/div><\/div><\/fieldset>\n<fieldset class=\"mtrc-fs\"><legend class=\"mtrc-legend\"><span class=\"mtrc-ico\" aria-hidden=\"true\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"#0b4f9c\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"12\" cy=\"12\" r=\"3\"\/><path d=\"M19.4 15a1.65 1.65 0 0 0 .33 1.82l.06.06a2 2 0 1 1-2.83 2.83l-.06-.06a1.65 1.65 0 0 0-1.82-.33 1.65 1.65 0 0 0-1 1.51V21a2 2 0 1 1-4 0v-.09A1.65 1.65 0 0 0 9 19.4a1.65 1.65 0 0 0-1.82.33l-.06.06a2 2 0 1 1-2.83-2.83l.06-.06A1.65 1.65 0 0 0 4.6 15a1.65 1.65 0 0 0-1.51-1H3a2 2 0 1 1 0-4h.09A1.65 1.65 0 0 0 4.6 9a1.65 1.65 0 0 0-.33-1.82l-.06-.06a2 2 0 1 1 2.83-2.83l.06.06A1.65 1.65 0 0 0 9 4.6a1.65 1.65 0 0 0 1-1.51V3a2 2 0 1 1 4 0v.09a1.65 1.65 0 0 0 1 1.51 1.65 1.65 0 0 0 1.82-.33l.06-.06a2 2 0 1 1 2.83 2.83l-.06.06A1.65 1.65 0 0 0 19.4 9a1.65 1.65 0 0 0 1.51 1H21a2 2 0 1 1 0 4h-.09a1.65 1.65 0 0 0-1.51 1z\"\/><\/svg><\/span>Service Conditions<\/legend><div class=\"mtrc-grid\"><div class=\"mtrc-field\"><label class=\"mtrc-label\" for=\"mtrc-exp\">Exposure type<\/label><select id=\"mtrc-exp\"><option value=\"continuous\">Continuous exposure<\/option><option value=\"intermittent\">Intermittent exposure<\/option><option value=\"short\">Short-term exposure<\/option><option value=\"cycling\">Thermal cycling<\/option><\/select><\/div><div class=\"mtrc-field\"><label class=\"mtrc-label\" for=\"mtrc-dur\">Exposure duration<\/label><div class=\"mtrc-row\"><input id=\"mtrc-dur\" type=\"number\" inputmode=\"decimal\" step=\"any\" min=\"0\" placeholder=\"Duration\" aria-describedby=\"mtrc-dur-err\"><select id=\"mtrc-durunit\" aria-label=\"Duration unit\"><option value=\"minutes\">Minutes<\/option><option value=\"hours\" selected>Hours<\/option><option value=\"days\">Days<\/option><option value=\"months\">Months<\/option><option value=\"years\">Years<\/option><\/select><\/div><span class=\"mtrc-error\" id=\"mtrc-dur-err\" role=\"alert\"><\/span><\/div><div class=\"mtrc-field\"><label class=\"mtrc-label\" for=\"mtrc-env\">Operating environment<\/label><select id=\"mtrc-env\"><option value=\"air\">Ambient air<\/option><option value=\"oxidizing\">Oxidizing atmosphere<\/option><option value=\"inert\">Inert atmosphere<\/option><option value=\"vacuum\">Vacuum<\/option><option value=\"water\">Water<\/option><option value=\"steam\">Steam<\/option><option value=\"chemical\">Chemical environment<\/option><option value=\"custom\">Custom environment<\/option><\/select><\/div><div class=\"mtrc-field\"><label class=\"mtrc-label\" for=\"mtrc-load\">Mechanical load condition<\/label><select id=\"mtrc-load\"><option value=\"none\">No significant mechanical load<\/option><option value=\"low\">Low load<\/option><option value=\"moderate\">Moderate load<\/option><option value=\"high\">High load<\/option><option value=\"unknown\">Unknown<\/option><\/select><\/div><div class=\"mtrc-field mtrc-span\" id=\"mtrc-envc-wrap\" hidden><label class=\"mtrc-label\" for=\"mtrc-envc\">Describe custom environment<\/label><input id=\"mtrc-envc\" type=\"text\" maxlength=\"160\" placeholder=\"e.g. sulfur-bearing flue gas, molten salt, hydraulic oil\"><\/div><\/div><\/fieldset>\n<fieldset class=\"mtrc-fs\"><legend class=\"mtrc-legend\"><span class=\"mtrc-ico\" aria-hidden=\"true\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"#0b4f9c\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M4 19.5A2.5 2.5 0 0 1 6.5 17H20\"\/><path d=\"M6.5 2H20v20H6.5A2.5 2.5 0 0 1 4 19.5v-15A2.5 2.5 0 0 1 6.5 2z\"\/><\/svg><\/span>Reference Information<\/legend><div class=\"mtrc-grid\"><div class=\"mtrc-field mtrc-span\"><label class=\"mtrc-label\" for=\"mtrc-src\">Material data source<\/label><input id=\"mtrc-src\" type=\"text\" maxlength=\"240\" placeholder=\"e.g. Supplier datasheet rev. 2025-03, ASME BPVC II-D\"><\/div><div class=\"mtrc-field mtrc-span\"><label class=\"mtrc-label\" for=\"mtrc-notes\">Notes or limitations<\/label><textarea id=\"mtrc-notes\" maxlength=\"1000\" placeholder=\"Any conditions attached to the limits, e.g. unloaded, dry air, max 1000 h\"><\/textarea><\/div><\/div><\/fieldset>\n<div class=\"mtrc-actions\"><button type=\"button\" class=\"mtrc-btn mtrc-btn-primary\" id=\"mtrc-calc\">Calculate<\/button><\/div>\n<\/form>\n<section class=\"mtrc-card mtrc-results\" id=\"mtrc-results\" aria-labelledby=\"mtrc-h-results\" tabindex=\"-1\" hidden>\n<h2 id=\"mtrc-h-results\" style=\"font-size:1.15rem;margin-bottom:12px\">Results<\/h2>\n<div class=\"mtrc-status\" id=\"mtrc-status\" role=\"status\" aria-live=\"polite\"><div class=\"mtrc-status-k\">Temperature compatibility status<\/div><div class=\"mtrc-status-t\" id=\"mtrc-status-t\">&#8212;<\/div><div class=\"mtrc-status-x\" id=\"mtrc-status-x\"><\/div><ul id=\"mtrc-status-list\" hidden><\/ul><\/div>\n<div class=\"mtrc-margin mtrc-ind-none\" id=\"mtrc-margin\"><div><div class=\"mtrc-margin-l\">Temperature margin to maximum<\/div><div class=\"mtrc-margin-v\" id=\"mtrc-margin-v\">&#8212;<\/div><\/div><div class=\"mtrc-margin-s\" id=\"mtrc-margin-s\">Insufficient data<\/div><\/div>\n<div class=\"mtrc-gauge\" aria-labelledby=\"mtrc-gauge-title\"><div class=\"mtrc-gauge-title\" id=\"mtrc-gauge-title\">Temperature range indicator<\/div><div class=\"mtrc-gauge-wrap\" id=\"mtrc-gauge\" role=\"img\" aria-label=\"Temperature range indicator\"><\/div><div class=\"mtrc-legend-row\"><span><i class=\"mtrc-sw\" style=\"background:#9bd3b5\"><\/i>Within specified range<\/span><span><i class=\"mtrc-sw\" style=\"background:#f6b26b\"><\/i>Approaching upper limit (user alert)<\/span><span><i class=\"mtrc-sw\" style=\"background:#f3d1cd\"><\/i>Outside specified range<\/span><\/div><\/div>\n<div class=\"mtrc-kpis\"><div class=\"mtrc-kpi\"><div class=\"mtrc-kpi-l\">Operating temperature<\/div><div class=\"mtrc-kpi-v\" id=\"mtrc-k-op\">&#8212;<\/div><div class=\"mtrc-kpi-s\" id=\"mtrc-k-op-s\"><\/div><\/div><div class=\"mtrc-kpi\"><div class=\"mtrc-kpi-l\">Maximum allowable<\/div><div class=\"mtrc-kpi-v\" id=\"mtrc-k-max\">&#8212;<\/div><div class=\"mtrc-kpi-s\" id=\"mtrc-k-max-s\"><\/div><\/div><div class=\"mtrc-kpi\"><div class=\"mtrc-kpi-l\">Minimum allowable<\/div><div class=\"mtrc-kpi-v\" id=\"mtrc-k-min\">&#8212;<\/div><div class=\"mtrc-kpi-s\" id=\"mtrc-k-min-s\"><\/div><\/div><div class=\"mtrc-kpi\"><div class=\"mtrc-kpi-l\">Remaining specified range<\/div><div class=\"mtrc-kpi-v\" id=\"mtrc-k-pct\">&#8212;<\/div><div class=\"mtrc-kpi-s\" id=\"mtrc-k-pct-s\">Remaining Percentage of Specified Operating Temperature Range<\/div><\/div><div class=\"mtrc-kpi mtrc-span\" style=\"grid-column:1\/-1\"><div class=\"mtrc-kpi-l\">Operating temperature category<\/div><div class=\"mtrc-kpi-v\" id=\"mtrc-k-cat\" style=\"font-size:1.2rem\">&#8212;<\/div><\/div><\/div>\n<div class=\"mtrc-subhead\">Equivalent temperatures<\/div>\n<table class=\"mtrc-table\" id=\"mtrc-conv\"><tbody><\/tbody><\/table>\n<\/section>\n<\/div>\n<div class=\"mtrc-toast\" id=\"mtrc-toast\" role=\"status\" aria-live=\"polite\"><\/div>\n<script>\n(function () {\n  \"use strict\";\n  var root = document.getElementById(\"mtrc-calculator\");\n  if (!root || root.getAttribute(\"data-mtrc-init\") === \"1\") { return; }\n  root.setAttribute(\"data-mtrc-init\", \"1\");\n  \/* =====================================================================\n     MATERIAL DATABASE\n     Only limits traceable to a named published source are populated (min,\n     max = continuous, maxInt = intermittent). Everything else is left null\n     and the calculator asks for verified values. Melting \/ decomposition\n     data is REFERENCE ONLY and is never used as a service limit.\n     ===================================================================== *\/\n  var CATS = [[\"cs\", \"Carbon Steels\"], [\"ss\", \"Stainless Steels\"], [\"as\", \"Alloy Steels\"], [\"al\", \"Aluminum Alloys\"], [\"cu\", \"Copper Alloys\"], [\"ni\", \"Nickel Alloys\"], [\"pl\", \"Plastics\"], [\"el\", \"Rubber and Elastomers\"], [\"ce\", \"Ceramics\"], [\"co\", \"Composite Materials\"], [\"ot\", \"Other \/ Custom\"]];\n  var CAT_NAME = {};\n  CATS.forEach(function (c) { CAT_NAME[c[0]] = c[1]; });\n  var SRC_ASM = \"ASM Metals Handbook, Desk Edition (2nd ed., 1998): suggested maximum service temperatures in dry air for stainless steels\";\n  var LT_ASM = \"Oxidation (scaling) limit in dry air, essentially unloaded. Not a strength, creep or design-code limit.\";\n  var SRC_SM = \"Special Metals Corporation product bulletin\";\n  var DATE_CHECK = \"Check the current revision\";\n  var N_CS = \"No single universal service-temperature limit. Allowable stresses at temperature come from the governing design code (e.g. ASME BPVC Section II-D, ASME B31.3). Strength reduction, creep and graphitization become concerns at elevated temperature, and low-temperature use depends on impact-test requirements.\";\n  var N_AS = \"No universal limit. Quenched-and-tempered grades should not be used above their tempering temperature, which changes their properties. Code allowable stresses or creep data govern elevated-temperature use.\";\n  var N_AL = \"Aluminum alloys lose strength progressively at elevated temperature, and prolonged exposure overages precipitation-hardened tempers. Obtain temperature-dependent properties for the specific temper.\";\n  var N_CU = \"Strength and hardness of work-hardened or precipitation-hardened tempers fall with temperature (softening and annealing). Limits depend on composition, temper and environment.\";\n  var N_PL = \"Generic resin family; the limit depends on the specific grade, fillers, stress and exposure time. Use the supplier datasheet (e.g. UL 746B RTI, continuous-use temperature) for the exact grade.\";\n  var N_EL = \"Elastomer temperature limits depend on the compound, not just the polymer type. Use the compound datasheet or its ASTM D2000 \/ SAE J200 classification, and consider compression set, fluid compatibility and aging.\";\n  var N_CE = \"Temperature capability depends on purity, porosity, bonding phase and atmosphere. Thermal shock and thermal-gradient stresses often govern before the material-intrinsic limit.\";\n  var N_CO = \"Governed by the matrix resin (glass transition and heat deflection temperatures) and fiber\/matrix bonding. Mechanical properties can drop sharply as the resin approaches its Tg.\";\n  function M(id, cat, name, o) { o = o || {}; return { id: id, cat: cat, name: name, custom: !!o.custom, min: o.min === undefined ? null : o.min, max: o.max === undefined ? null : o.max, maxInt: o.maxInt === undefined ? null : o.maxInt, limitType: o.lt || \"\", src: o.src || \"\", srcDate: o.date || \"\", melt: o.melt || \"\", note: o.note || \"\" }; }\n  var DB = [\n    M(\"a36\", \"cs\", \"ASTM A36\", { melt: \"\u2248 1425\u20131540 \u00b0C melting range (typical carbon steel)\", note: N_CS }),\n    M(\"1018\", \"cs\", \"AISI 1018\", { melt: \"\u2248 1425\u20131540 \u00b0C melting range (typical carbon steel)\", note: N_CS }),\n    M(\"1045\", \"cs\", \"AISI 1045\", { melt: \"\u2248 1425\u20131500 \u00b0C melting range (typical medium-carbon steel)\", note: N_CS + \" Heat-treated 1045 should also stay below its tempering temperature.\" }),\n    M(\"cs-custom\", \"cs\", \"Custom Carbon Steel\", { custom: true, note: N_CS }),\n    M(\"304\", \"ss\", \"AISI 304\", { max: 925, maxInt: 870, lt: LT_ASM, src: SRC_ASM, date: \"1998\", melt: \"\u2248 1400\u20131450 \u00b0C melting range\", note: \"Austenitic grade, widely used at low temperatures; confirm low-temperature limits against impact or code requirements. Sensitization (\u2248 425\u2013815 \u00b0C) can reduce corrosion resistance in non-L grades, and creep governs loaded parts long before the scaling limit.\" }),\n    M(\"316\", \"ss\", \"AISI 316\", { max: 925, maxInt: 870, lt: LT_ASM, src: SRC_ASM, date: \"1998\", melt: \"\u2248 1375\u20131400 \u00b0C melting range\", note: \"Austenitic Mo-bearing grade. Sigma-phase embrittlement can develop after long exposure at roughly 550\u2013900 \u00b0C. Creep and code allowable stresses govern loaded parts.\" }),\n    M(\"310\", \"ss\", \"AISI 310\", { max: 1150, maxInt: 1035, lt: LT_ASM, src: SRC_ASM, date: \"1998\", melt: \"\u2248 1400\u20131450 \u00b0C melting range\", note: \"Heat-resistant austenitic grade (25Cr-20Ni). It can form sigma phase at roughly 650\u2013900 \u00b0C, which reduces room-temperature toughness. Creep strength must be checked for loaded parts.\" }),\n    M(\"321\", \"ss\", \"AISI 321\", { max: 925, maxInt: 870, lt: LT_ASM, src: SRC_ASM, date: \"1998\", melt: \"\u2248 1400\u20131425 \u00b0C melting range\", note: \"Titanium-stabilized austenitic grade that resists sensitization in the \u2248 425\u2013815 \u00b0C range. Creep and code allowable stresses govern loaded parts.\" }),\n    M(\"430\", \"ss\", \"AISI 430\", { max: 815, maxInt: 870, lt: LT_ASM, src: SRC_ASM, date: \"1998\", melt: \"\u2248 1425\u20131510 \u00b0C melting range\", note: \"Ferritic grade. It is susceptible to \u2248 475 \u00b0C embrittlement (about 400\u2013540 \u00b0C) and has poor low-temperature toughness. For ferritic grades the published intermittent limit is higher than the continuous one.\" }),\n    M(\"ss-custom\", \"ss\", \"Custom Stainless Steel\", { custom: true, note: \"Enter verified limits from the grade datasheet or the governing code.\" }),\n    M(\"4140\", \"as\", \"AISI 4140\", { melt: \"\u2248 1415\u20131500 \u00b0C melting range (typical low-alloy steel)\", note: N_AS }),\n    M(\"4340\", \"as\", \"AISI 4340\", { melt: \"\u2248 1415\u20131500 \u00b0C melting range (typical low-alloy steel)\", note: N_AS }),\n    M(\"crmo\", \"as\", \"Cr-Mo Alloy Steel\", { melt: \"\u2248 1415\u20131500 \u00b0C melting range (typical low-alloy steel)\", note: \"Cr-Mo grades (e.g. 1\u00bcCr-\u00bdMo, 2\u00bcCr-1Mo, 9Cr-1Mo-V) are used for elevated-temperature pressure service. The usable temperature comes from the governing code\u2019s allowable-stress tables for the exact specification.\" }),\n    M(\"as-custom\", \"as\", \"Custom Alloy Steel\", { custom: true, note: N_AS }),\n    M(\"6061\", \"al\", \"Aluminum 6061\", { melt: \"\u2248 582\u2013652 \u00b0C melting range\", note: N_AL }),\n    M(\"6063\", \"al\", \"Aluminum 6063\", { melt: \"\u2248 615\u2013655 \u00b0C melting range\", note: N_AL }),\n    M(\"7075\", \"al\", \"Aluminum 7075\", { melt: \"\u2248 477\u2013635 \u00b0C melting range\", note: N_AL + \" 7075 tempers are particularly sensitive to strength loss after elevated-temperature exposure.\" }),\n    M(\"5052\", \"al\", \"Aluminum 5052\", { melt: \"\u2248 607\u2013649 \u00b0C melting range\", note: \"Non-heat-treatable alloy. Strength falls progressively at elevated temperature, and strain-hardened (H) tempers can soften (recover or anneal) with prolonged exposure. Obtain temperature-dependent properties for the specific temper.\" }),\n    M(\"al-custom\", \"al\", \"Custom Aluminum Alloy\", { custom: true, note: N_AL }),\n    M(\"cu\", \"cu\", \"Pure Copper\", { melt: \"\u2248 1083\u20131085 \u00b0C melting point\", note: N_CU + \" Copper oxidizes readily in air at elevated temperature.\" }),\n    M(\"brass\", \"cu\", \"Brass\", { melt: \"\u2248 900\u2013940 \u00b0C melting range (composition-dependent)\", note: N_CU + \" Zinc-rich brasses can dezincify in some waters and can lose zinc at high temperature.\" }),\n    M(\"bronze\", \"cu\", \"Bronze\", { melt: \"\u2248 950\u20131050 \u00b0C melting range (composition-dependent)\", note: N_CU }),\n    M(\"cu-custom\", \"cu\", \"Custom Copper Alloy\", { custom: true, note: N_CU }),\n    M(\"in600\", \"ni\", \"Inconel 600\", { max: 1175, lt: \"Oxidation resistance limit in air stated by the producer. Not a strength, creep or design-code limit.\", src: SRC_SM + \" (INCONEL alloy 600)\", date: DATE_CHECK, melt: \"\u2248 1354\u20131413 \u00b0C melting range\", note: \"Ni-Cr-Fe alloy with good oxidation and carburization resistance. Loaded components need creep and stress-rupture data, and it is susceptible to sulfidation in sulfur-bearing atmospheres.\" }),\n    M(\"in625\", \"ni\", \"Inconel 625\", { max: 980, lt: \"Oxidation (scaling) resistance limit stated by the producer. Not a strength, creep or design-code limit.\", src: SRC_SM + \" (INCONEL alloy 625)\", date: DATE_CHECK, melt: \"\u2248 1290\u20131350 \u00b0C melting range\", note: \"Ni-Cr-Mo-Nb alloy. Long exposure at roughly 600\u2013900 \u00b0C can reduce ductility through precipitation. Check creep and code allowable stresses for loaded parts.\" }),\n    M(\"in718\", \"ni\", \"Inconel 718\", { min: -253, max: 704, lt: \"Producer-stated useful service range for the precipitation-hardened alloy (\u2212423 \u00b0F to 1300 \u00b0F).\", src: SRC_SM + \" (INCONEL alloy 718)\", date: DATE_CHECK, melt: \"\u2248 1260\u20131336 \u00b0C melting range\", note: \"Age-hardened Ni-Fe-Cr alloy. Strength depends on heat treatment, and above about 650 \u00b0C its properties degrade with time. Use design-allowable data for critical parts.\" }),\n    M(\"c276\", \"ni\", \"Hastelloy C-276\", { melt: \"\u2248 1325\u20131370 \u00b0C melting range\", note: \"Primarily a corrosion-resistant alloy. Elevated-temperature limits depend on the environment and on thermal-stability concerns (precipitation during long exposure). Use the producer datasheet and code data.\" }),\n    M(\"ni-custom\", \"ni\", \"Custom Nickel Alloy\", { custom: true, note: \"Enter verified limits from the producer datasheet or the governing code.\" }),\n    M(\"ptfe\", \"pl\", \"PTFE\", { max: 260, lt: \"Continuous service temperature commonly stated by resin producers. PTFE creeps (cold flow) under load well below this value.\", src: \"Chemours Teflon\u2122 PTFE properties handbook (typical resin data)\", date: DATE_CHECK, melt: \"\u2248 327 \u00b0C crystalline melting point; decomposes above \u2248 400 \u00b0C\", note: \"Low strength and significant creep under sustained load. Filled grades behave differently. Do not heat above the service limit: decomposition products are hazardous.\" }),\n    M(\"peek\", \"pl\", \"PEEK\", { max: 260, lt: \"UL 746B relative thermal index (electrical) quoted for unfilled PEEK. Mechanical RTI values are lower, and stiffness drops markedly above Tg \u2248 143 \u00b0C.\", src: \"Victrex PEEK typical properties datasheet (UL 746B RTI)\", date: DATE_CHECK, melt: \"\u2248 343 \u00b0C melting point; Tg \u2248 143 \u00b0C\", note: \"For loaded parts, use the mechanical RTI and creep data for the specific grade. Glass- or carbon-filled grades extend dimensional stability above Tg.\" }),\n    M(\"pvc\", \"pl\", \"PVC\", { max: 60, lt: \"Maximum service temperature for rigid PVC pressure pipe. Pressure rating derates sharply above 23 \u00b0C.\", src: \"Rigid PVC pressure pipe industry guidance (ASTM D1785 Schedule 40\/80 pipe literature)\", date: DATE_CHECK, melt: \"No sharp melting point; Vicat softening typically \u2248 75\u201385 \u00b0C (rigid PVC); thermal degradation releases HCl\", note: \"Applies to rigid PVC pressure pipe. Flexible (plasticized) PVC compounds differ. Rigid PVC also becomes brittle at low temperature.\" }),\n    M(\"pp\", \"pl\", \"Polypropylene (PP)\", { melt: \"\u2248 160\u2013165 \u00b0C melting point (homopolymer)\", note: N_PL + \" PP becomes brittle at low temperature, especially homopolymer grades.\" }),\n    M(\"pe\", \"pl\", \"Polyethylene (PE)\", { melt: \"HDPE \u2248 130\u2013137 \u00b0C; LDPE \u2248 105\u2013115 \u00b0C melting range\", note: N_PL }),\n    M(\"pa\", \"pl\", \"Nylon (PA)\", { melt: \"PA6 \u2248 220 \u00b0C; PA66 \u2248 260 \u00b0C melting point\", note: N_PL + \" Moisture absorption changes properties, and heat-stabilized grades are rated higher.\" }),\n    M(\"pc\", \"pl\", \"Polycarbonate (PC)\", { melt: \"Amorphous; Tg \u2248 145\u2013150 \u00b0C (no sharp melting point)\", note: N_PL + \" PC is sensitive to hydrolysis in hot water or steam and to stress cracking in some chemicals.\" }),\n    M(\"abs\", \"pl\", \"ABS\", { melt: \"Amorphous; Tg \u2248 105 \u00b0C (no sharp melting point)\", note: N_PL }),\n    M(\"si\", \"el\", \"Silicone Rubber\", { melt: \"Not applicable: elastomers degrade rather than melt\", note: N_EL }),\n    M(\"epdm\", \"el\", \"EPDM\", { melt: \"Not applicable: elastomers degrade rather than melt\", note: N_EL + \" EPDM is not compatible with mineral oils.\" }),\n    M(\"nbr\", \"el\", \"NBR\", { melt: \"Not applicable: elastomers degrade rather than melt\", note: N_EL + \" The low-temperature limit depends on acrylonitrile content.\" }),\n    M(\"fkm\", \"el\", \"FKM\", { melt: \"Not applicable: elastomers degrade rather than melt\", note: N_EL + \" Standard FKM grades have limited low-temperature flexibility.\" }),\n    M(\"nr\", \"el\", \"Natural Rubber\", { melt: \"Not applicable: elastomers degrade rather than melt\", note: N_EL + \" Natural rubber is sensitive to ozone, oils and heat aging.\" }),\n    M(\"alumina\", \"ce\", \"Alumina\", { melt: \"\u2248 2050\u20132072 \u00b0C melting point (high-purity Al\u2082O\u2083)\", note: N_CE }),\n    M(\"zirconia\", \"ce\", \"Zirconia\", { melt: \"\u2248 2700 \u00b0C melting point\", note: N_CE + \" Stabilized zirconias can degrade through phase transformation (e.g. low-temperature degradation of Y-TZP in moist environments).\" }),\n    M(\"sic\", \"ce\", \"Silicon Carbide\", { melt: \"No melting at atmospheric pressure; decomposes \/ sublimes \u2248 2700 \u00b0C\", note: N_CE + \" In oxidizing atmospheres, SiC relies on a protective silica layer, and its behavior depends on the grade (sintered, reaction-bonded, etc.).\" }),\n    M(\"ce-custom\", \"ce\", \"Custom Ceramic\", { custom: true, note: N_CE }),\n    M(\"fg\", \"co\", \"Fiberglass Composite\", { melt: \"Governed by the matrix resin (see resin Tg \/ HDT)\", note: N_CO }),\n    M(\"cf\", \"co\", \"Carbon Fiber Composite\", { melt: \"Governed by the matrix resin (see resin Tg \/ HDT)\", note: N_CO }),\n    M(\"gfrp\", \"co\", \"Glass Fiber Reinforced Polymer\", { melt: \"Governed by the matrix resin (see resin Tg \/ HDT)\", note: N_CO }),\n    M(\"co-custom\", \"co\", \"Custom Composite\", { custom: true, note: N_CO }),\n    M(\"custom\", \"ot\", \"Custom Industrial Material\", { custom: true, note: \"Enter verified temperature limits from your own material datasheet.\" })\n  ];\n  var DBI = {};\n  DB.forEach(function (m) { DBI[m.id] = m; });\n  var UNIT_SYM = { C: \"\u00b0C\", F: \"\u00b0F\", K: \"K\" };\n  var ABS_ZERO_C = -273.15;\n  var STATUS = {\n    within: { t: \"Within Specified Temperature Limits\", x: \"The selected operating temperature is within the documented temperature limits entered for this material. Further evaluation of mechanical loading, environmental exposure, and application-specific requirements may still be necessary.\" },\n    over: { t: \"Maximum Temperature Limit Exceeded\", x: \"The operating temperature exceeds the specified maximum allowable temperature. The material should not be used at this temperature unless verified data for these conditions supports a higher limit.\" },\n    under: { t: \"Minimum Temperature Limit Exceeded\", x: \"The operating temperature is below the specified minimum operating temperature. Low-temperature effects such as loss of toughness, embrittlement or loss of sealing may occur.\" },\n    insufficient: { t: \"Insufficient Material Data\", x: \"No verified maximum allowable operating temperature is available for this material. Enter the maximum allowable temperature from the manufacturer\u2019s datasheet or the governing design code to evaluate compatibility.\" },\n    review: { t: \"Additional Engineering Review Required\", x: \"The operating temperature lies within the entered limits, but temperature compatibility alone cannot establish suitability for the selected application. The following service conditions are incomplete or unconfirmed:\" },\n    invalid: { t: \"Check Inputs\", x: \"Correct the highlighted fields to calculate.\" }\n  };\n  \/* =====================================================================\n     ENGINE (pure functions, no DOM)\n     ===================================================================== *\/\n  \/* Absolute temperature conversions:\n     \u00b0F = (\u00b0C \u00d7 9\/5) + 32 ;  \u00b0C = (\u00b0F \u2212 32) \u00d7 5\/9 ;  K = \u00b0C + 273.15 *\/\n  function toC(v, u) { return u === \"F\" ? (v - 32) * 5 \/ 9 : (u === \"K\" ? v - 273.15 : v); }\n  function fromC(c, u) { return u === \"F\" ? c * 9 \/ 5 + 32 : (u === \"K\" ? c + 273.15 : c); }\n  \/* Temperature DIFFERENCE conversions (no offset): \u0394\u00b0F = \u0394\u00b0C \u00d7 1.8 ; \u0394K = \u0394\u00b0C *\/\n  function dFromC(d, u) { return u === \"F\" ? d * 1.8 : d; }\n  function dToC(d, u) { return u === \"F\" ? d \/ 1.8 : d; }\n  function category(c) {\n    if (c < -50) { return \"Cryogenic Service\"; }\n    if (c <= 150) { return \"Low-to-Moderate Temperature\"; }\n    if (c <= 400) { return \"Elevated Temperature\"; }\n    if (c <= 800) { return \"High Temperature\"; }\n    if (c <= 1200) { return \"Very High Temperature\"; }\n    return \"Extreme Temperature\";\n  }\n  \/* Choose which published limit applies: intermittent limit for intermittent exposure \/ thermal cycling when one exists. *\/\n  function refMax(mat, exp) {\n    if (!mat) { return null; }\n    var useInt = (exp === \"intermittent\" || exp === \"cycling\") ? mat.maxInt !== null : false;\n    return useInt ? mat.maxInt : mat.max;\n  }\n  \/* inp: { opC, minC|null, maxC|null, alertC, confirm, load, env, envDesc, duration|null } \u2014 all temperatures in \u00b0C *\/\n  function evaluate(inp) {\n    var R = { key: \"\", indicator: \"none\", margin: null, marginMin: null, pct: null, approaching: false, review: [], category: category(inp.opC) };\n    if (inp.maxC !== null) {\n      \/* Temperature Margin = Maximum Allowable Operating Temperature \u2212 Operating Temperature *\/\n      R.margin = inp.maxC - inp.opC;\n    }\n    if (inp.minC !== null) { R.marginMin = inp.opC - inp.minC; }\n    if (inp.maxC !== null ? inp.minC !== null : false) {\n      \/* Remaining % of specified range = (Tmax \u2212 Top) \/ (Tmax \u2212 Tmin) \u00d7 100 \u2014 only when Tmax > Tmin *\/\n      if (inp.maxC > inp.minC) { R.pct = (inp.maxC - inp.opC) \/ (inp.maxC - inp.minC) * 100; }\n    }\n    if (inp.maxC === null) { R.key = \"insufficient\"; R.indicator = \"none\"; return R; }\n    if (inp.opC > inp.maxC) { R.key = \"over\"; R.indicator = \"bad\"; return R; }\n    if (inp.minC !== null ? inp.opC < inp.minC : false) { R.key = \"under\"; R.indicator = \"bad\"; return R; }\n    R.approaching = R.margin <= inp.alertC;\n    R.indicator = R.approaching ? \"approach\" : \"ok\";\n    if (!inp.confirm) { R.review.push(\"The applicability of the entered limits to the selected exposure type, environment and load has not been confirmed.\"); }\n    if (inp.load === \"unknown\") { R.review.push(\"The mechanical load condition is unknown.\"); }\n    if (inp.env === \"custom\" ? !inp.envDesc : false) { R.review.push(\"The custom operating environment is not described.\"); }\n    if (inp.duration === null) { R.review.push(\"The exposure duration is not specified.\"); }\n    R.key = R.review.length ? \"review\" : \"within\";\n    return R;\n  }\n  root.mtrcEngine = { toC: toC, fromC: fromC, dFromC: dFromC, category: category, evaluate: evaluate, DB: DB };\n  \/* =====================================================================\n     FORMATTING HELPERS\n     ===================================================================== *\/\n  function fmt(v, d) {\n    if (v === null || v === undefined || !isFinite(v)) { return \"\u2014\"; }\n    d = d === undefined ? 2 : d;\n    var r = Number(v.toFixed(d));\n    if (r === 0) { r = 0; }\n    return r.toLocaleString(\"en-US\", { maximumFractionDigits: d });\n  }\n  function signed(v, d) { return v === null ? \"\u2014\" : (v > 0 ? \"+\" : (v < 0 ? \"\u2212\" : \"\")) + fmt(Math.abs(v), d); }\n  function fT(c, u) { return c === null ? \"\u2014\" : fmt(fromC(c, u)) + \" \" + UNIT_SYM[u]; }\n  function fD(dc, u) { return dc === null ? \"\u2014\" : signed(dFromC(dc, u)) + \" \" + (u === \"K\" ? \"K\" : \"\u0394\" + UNIT_SYM[u]); }\n  function fAll(c) { return c === null ? \"\u2014\" : fmt(c) + \" \u00b0C \/ \" + fmt(fromC(c, \"F\")) + \" \u00b0F \/ \" + fmt(fromC(c, \"K\")) + \" K\"; }\n  function fAllD(dc) { return dc === null ? \"\u2014\" : signed(dc) + \" \u0394\u00b0C \/ \" + signed(dc * 1.8) + \" \u0394\u00b0F \/ \" + signed(dc) + \" K\"; }\n  function inputStr(v) { var r = Number(v.toFixed(2)); if (r === 0) { r = 0; } return String(r); }\n  \/* =====================================================================\n     DOM\n     ===================================================================== *\/\n  function $(id) { return root.querySelector(\"#\" + id); }\n  function mk(tag, cls, text) { var n = document.createElement(tag); if (cls) { n.className = cls; } if (text !== undefined) { n.textContent = text; } return n; }\n  function clear(n) { while (n.firstChild) { n.removeChild(n.firstChild); } }\n  var el = {\n    cat: $(\"mtrc-cat\"), search: $(\"mtrc-search\"), mat: $(\"mtrc-mat\"), customWrap: $(\"mtrc-custom-wrap\"), custom: $(\"mtrc-custom\"), grade: $(\"mtrc-grade\"),\n    op: $(\"mtrc-op\"), opErr: $(\"mtrc-op-err\"), unit: $(\"mtrc-unit\"), max: $(\"mtrc-max\"), maxErr: $(\"mtrc-max-err\"), maxBadge: $(\"mtrc-max-badge\"), min: $(\"mtrc-min\"), minErr: $(\"mtrc-min-err\"),\n    confirm: $(\"mtrc-confirm\"), alert: $(\"mtrc-alert\"), alertErr: $(\"mtrc-alert-err\"), exp: $(\"mtrc-exp\"), dur: $(\"mtrc-dur\"), durUnit: $(\"mtrc-durunit\"), durErr: $(\"mtrc-dur-err\"),\n    env: $(\"mtrc-env\"), envcWrap: $(\"mtrc-envc-wrap\"), envc: $(\"mtrc-envc\"), load: $(\"mtrc-load\"), src: $(\"mtrc-src\"), notes: $(\"mtrc-notes\"),\n    calc: $(\"mtrc-calc\"), results: $(\"mtrc-results\"),\n    status: $(\"mtrc-status\"), statusT: $(\"mtrc-status-t\"), statusX: $(\"mtrc-status-x\"), statusList: $(\"mtrc-status-list\"),\n    margin: $(\"mtrc-margin\"), marginV: $(\"mtrc-margin-v\"), marginS: $(\"mtrc-margin-s\"), gauge: $(\"mtrc-gauge\"),\n    kOp: $(\"mtrc-k-op\"), kOpS: $(\"mtrc-k-op-s\"), kMax: $(\"mtrc-k-max\"), kMaxS: $(\"mtrc-k-max-s\"), kMin: $(\"mtrc-k-min\"), kMinS: $(\"mtrc-k-min-s\"), kPct: $(\"mtrc-k-pct\"), kPctS: $(\"mtrc-k-pct-s\"), kCat: $(\"mtrc-k-cat\"),\n    conv: root.querySelector(\"#mtrc-conv tbody\"),\n    copy: $(\"mtrc-copy\"), csv: $(\"mtrc-csv\"), print: $(\"mtrc-print\"), \n    toast: $(\"mtrc-toast\")\n  };\n  var state = { unit: \"C\", refMin: false, refMax: false, refSrc: false, example: false, last: null };\n  var DEFAULTS = { cat: \"all\", search: \"\", mat: \"304\", custom: \"\", grade: \"\", unit: \"C\", op: \"400\", min: \"\", max: null, confirm: false, alert: \"50\", exp: \"continuous\", dur: \"\", durUnit: \"hours\", env: \"air\", envc: \"\", load: \"none\", notes: \"\" };\n  \/* ---------- material selector (category + search) ---------- *\/\n  function buildCatOptions() {\n    clear(el.cat);\n    var o = mk(\"option\", \"\", \"All categories\"); o.value = \"all\"; el.cat.appendChild(o);\n    CATS.forEach(function (c) { var op = mk(\"option\", \"\", c[1]); op.value = c[0]; el.cat.appendChild(op); });\n  }\n  function matchesSearch(m, q) {\n    if (!q) { return true; }\n    var hay = (m.name + \" \" + CAT_NAME[m.cat] + \" \" + m.id).toLowerCase();\n    return q.split(\/\\s+\/).every(function (w) { return hay.indexOf(w) >= 0; });\n  }\n  function buildMatOptions(keepId) {\n    var cat = el.cat.value, q = el.search.value.trim().toLowerCase(), first = null, keepFound = false;\n    clear(el.mat);\n    CATS.forEach(function (c) {\n      if (cat !== \"all\" ? cat !== c[0] : false) { return; }\n      var items = DB.filter(function (m) { return m.cat === c[0] ? matchesSearch(m, q) : false; });\n      if (!items.length) { return; }\n      var g = document.createElement(\"optgroup\"); g.label = c[1];\n      items.forEach(function (m) {\n        var o = mk(\"option\", \"\", m.name + (m.max !== null ? \"\" : (m.custom ? \"\" : \" \u2014 enter verified limits\"))); o.value = m.id; g.appendChild(o);\n        if (!first) { first = m.id; }\n        if (m.id === keepId) { keepFound = true; }\n      });\n      el.mat.appendChild(g);\n    });\n    if (!first) { var none = mk(\"option\", \"\", \"No matching materials\"); none.value = \"\"; none.disabled = true; el.mat.appendChild(none); el.mat.value = \"\"; return null; }\n    el.mat.value = keepFound ? keepId : first;\n    return el.mat.value;\n  }\n  function currentMat() { return DBI[el.mat.value] || null; }\n  function setBadge() {\n    var hasMax = el.max.value.trim() !== \"\";\n    el.maxBadge.className = \"mtrc-badge \" + (!hasMax ? \"mtrc-b-none\" : (state.example ? \"mtrc-b-ex\" : (state.refMax ? \"mtrc-b-ref\" : \"mtrc-b-user\")));\n    el.maxBadge.textContent = !hasMax ? \"Not set\" : (state.example ? \"Hypothetical example\" : (state.refMax ? \"Typical published guidance\" : \"User-entered\"));\n  }\n  \/* Fill the limit fields from the database (typical published guidance) or clear them when no data exists. *\/\n  function applyMaterial() {\n    var m = currentMat();\n    state.example = false;\n    el.customWrap.hidden = !(m ? m.custom : false);\n    var u = state.unit;\n    if (m ? m.max !== null : false) {\n      el.max.value = inputStr(fromC(refMax(m, el.exp.value), u));\n      el.min.value = m.min !== null ? inputStr(fromC(m.min, u)) : \"\";\n      el.src.value = m.src + (m.srcDate ? \" (\" + m.srcDate + \")\" : \"\") + \" \u2014 typical guidance; verify\";\n      state.refMax = true; state.refMin = m.min !== null; state.refSrc = true;\n    } else {\n      el.max.value = \"\"; el.min.value = \"\"; el.src.value = \"\";\n      state.refMax = false; state.refMin = false; state.refSrc = false;\n    }\n  }\n  \/* ---------- reading and validation ---------- *\/\n  function num(input) {\n    var s = String(input.value).trim();\n    if (s === \"\") { return null; }\n    var v = Number(s);\n    return isFinite(v) ? v : NaN;\n  }\n  function setErr(input, errEl, msg) {\n    errEl.textContent = msg || \"\";\n    if (msg) { input.classList.add(\"mtrc-invalid\"); input.setAttribute(\"aria-invalid\", \"true\"); }\n    else { input.classList.remove(\"mtrc-invalid\"); input.removeAttribute(\"aria-invalid\"); }\n    return msg ? 1 : 0;\n  }\n  function absTemp(input, errEl, required, label) {\n    var v = num(input), u = state.unit;\n    if (v === null) { setErr(input, errEl, required ? \"Enter the \" + label + \".\" : \"\"); return { ok: !required, c: null }; }\n    if (isNaN(v)) { setErr(input, errEl, \"Enter a valid number.\"); return { ok: false, c: null }; }\n    var c = toC(v, u);\n    if (c < ABS_ZERO_C - 1e-9) { setErr(input, errEl, \"Below absolute zero (\" + fmt(fromC(ABS_ZERO_C, u)) + \" \" + UNIT_SYM[u] + \") is not possible.\"); return { ok: false, c: null }; }\n    setErr(input, errEl, \"\");\n    return { ok: true, c: c };\n  }\n  function readInputs() {\n    var errs = [];\n    var op = absTemp(el.op, el.opErr, true, \"operating temperature\");\n    var mx = absTemp(el.max, el.maxErr, false, \"maximum allowable temperature\");\n    var mn = absTemp(el.min, el.minErr, false, \"minimum allowable temperature\");\n    if (!op.ok) { errs.push(\"Operating temperature\"); }\n    if (!mx.ok) { errs.push(\"Maximum allowable temperature\"); }\n    if (!mn.ok) { errs.push(\"Minimum allowable temperature\"); }\n    if (mx.ok ? (mn.ok ? (mx.c !== null ? (mn.c !== null ? mx.c <= mn.c : false) : false) : false) : false) {\n      setErr(el.max, el.maxErr, \"Maximum must be greater than the minimum allowable temperature.\");\n      errs.push(\"Maximum below minimum\");\n    }\n    var a = num(el.alert), alertC = 0;\n    if (a === null) { alertC = 0; setErr(el.alert, el.alertErr, \"\"); }\n    else if (isNaN(a) ? true : a < 0) { setErr(el.alert, el.alertErr, \"Enter a temperature difference of zero or more.\"); errs.push(\"Alert threshold\"); }\n    else { alertC = dToC(a, state.unit); setErr(el.alert, el.alertErr, \"\"); }\n    var d = num(el.dur), duration = null;\n    if (d === null) { setErr(el.dur, el.durErr, \"\"); }\n    else if (isNaN(d)) { setErr(el.dur, el.durErr, \"Enter a valid number.\"); errs.push(\"Exposure duration\"); }\n    else if (d < 0) { setErr(el.dur, el.durErr, \"Exposure duration cannot be negative.\"); errs.push(\"Exposure duration\"); }\n    else { duration = d; setErr(el.dur, el.durErr, \"\"); }\n    return { errs: errs, opC: op.c, maxC: mx.c, minC: mn.c, alertC: alertC, confirm: el.confirm.checked, exp: el.exp.value, duration: duration, durUnit: el.durUnit.value, env: el.env.value, envDesc: el.envc.value.trim(), load: el.load.value };\n  }\n  \/* ---------- rendering ---------- *\/\n  function setStatus(key, extraList) {\n    el.status.className = \"mtrc-status mtrc-st-\" + key;\n    el.statusT.textContent = STATUS[key].t;\n    el.statusX.textContent = STATUS[key].x;\n    clear(el.statusList);\n    el.statusList.hidden = !(extraList ? extraList.length : 0);\n    (extraList || []).forEach(function (t) { el.statusList.appendChild(mk(\"li\", \"\", t)); });\n  }\n  function tableRows(tbody, rows) {\n    clear(tbody);\n    rows.forEach(function (r) { var tr = mk(\"tr\"); var th = mk(\"th\", \"\", r[0]); th.scope = \"row\"; tr.appendChild(th); tr.appendChild(mk(\"td\", \"\", r[1])); tbody.appendChild(tr); });\n  }\n  function renderGauge(inp, R) {\n    clear(el.gauge);\n    var u = state.unit;\n    var vals = [inp.opC]; if (inp.maxC !== null) { vals.push(inp.maxC); } if (inp.minC !== null) { vals.push(inp.minC); }\n    var lo = Math.min.apply(null, vals), hi = Math.max.apply(null, vals), span = hi - lo;\n    var pad = Math.max(span * 0.18, 15);\n    lo = Math.max(ABS_ZERO_C, lo - pad); hi = hi + pad;\n    function pos(v) { return Math.max(0, Math.min(100, (v - lo) \/ (hi - lo) * 100)); }\n    var track = mk(\"div\", \"mtrc-track\" + (inp.maxC === null ? \" mtrc-track-none\" : \"\"));\n    if (inp.maxC !== null) {\n      var a0 = inp.minC !== null ? pos(inp.minC) : 0, a1 = pos(inp.maxC);\n      var allowed = mk(\"div\", \"mtrc-allowed\"); allowed.style.left = a0 + \"%\"; allowed.style.width = Math.max(0, a1 - a0) + \"%\"; track.appendChild(allowed);\n      if (inp.alertC > 0) {\n        var ap0 = pos(Math.max(inp.maxC - inp.alertC, inp.minC !== null ? inp.minC : lo));\n        var ap = mk(\"div\", \"mtrc-approach\"); ap.style.left = ap0 + \"%\"; ap.style.width = Math.max(0, a1 - ap0) + \"%\"; track.appendChild(ap);\n      }\n    }\n    el.gauge.appendChild(track);\n    function marker(v, cls, label) { var mkr = mk(\"div\", \"mtrc-mk \" + cls); mkr.style.left = pos(v) + \"%\"; var s = mk(\"span\"); s.textContent = label; mkr.appendChild(s); el.gauge.appendChild(mkr); }\n    if (inp.minC !== null) { marker(inp.minC, \"mtrc-mk-min\", \"Min \" + fT(inp.minC, u)); }\n    if (inp.maxC !== null) { marker(inp.maxC, \"mtrc-mk-max\", \"Max \" + fT(inp.maxC, u)); }\n    var op = mk(\"div\", \"mtrc-op\"); op.style.left = pos(inp.opC) + \"%\";\n    op.appendChild(mk(\"div\", \"mtrc-op-lab\", \"Operating \" + fT(inp.opC, u))); op.appendChild(mk(\"div\", \"mtrc-op-pin\")); op.appendChild(mk(\"div\", \"mtrc-op-line\"));\n    el.gauge.appendChild(op);\n    var lab = \"Temperature range indicator: operating \" + fT(inp.opC, u) + (inp.minC !== null ? \", minimum \" + fT(inp.minC, u) : \"\") + (inp.maxC !== null ? \", maximum \" + fT(inp.maxC, u) : \", maximum not set\");\n    el.gauge.setAttribute(\"aria-label\", lab);\n  }\n  function renderInvalid(inp) {\n    setStatus(\"invalid\", inp.errs.map(function (e) { return e + \" is missing or invalid.\"; }));\n    el.margin.className = \"mtrc-margin mtrc-ind-none\"; el.marginV.textContent = \"\u2014\"; el.marginS.textContent = \"Fix inputs to calculate\";\n    clear(el.gauge); el.gauge.appendChild(mk(\"div\", \"mtrc-empty\", \"The gauge appears once the inputs are valid.\"));\n    [el.kOp, el.kMax, el.kMin, el.kPct, el.kCat].forEach(function (k) { k.textContent = \"\u2014\"; });\n    [el.kOpS, el.kMaxS, el.kMinS].forEach(function (k) { k.textContent = \"\"; });\n    clear(el.conv);\n    state.last = null;\n  }\n  function render() {\n    var inp = readInputs();\n    el.envcWrap.hidden = el.env.value !== \"custom\";\n    setBadge();\n    if (inp.errs.length) { renderInvalid(inp); return; }\n    var R = evaluate(inp), u = state.unit;\n    setStatus(R.key, R.key === \"review\" ? R.review : null);\n    if (R.key === \"within\" ? R.approaching : false) { el.statusX.textContent = STATUS.within.x + \" The margin is within your user-defined \u201capproaching limit\u201d alert.\"; }\n    el.margin.className = \"mtrc-margin mtrc-ind-\" + R.indicator;\n    el.marginV.textContent = R.margin === null ? \"\u2014\" : fD(R.margin, u);\n    el.marginS.textContent = R.margin === null ? \"Insufficient data: enter a maximum allowable temperature\" : (R.indicator === \"bad\" ? (R.key === \"under\" ? \"Below the specified minimum by \" + fD(-R.marginMin, u).replace(\"+\", \"\") : \"Upper limit exceeded\") : (R.approaching ? \"Approaching the upper limit (user-defined alert)\" : \"Within the specified temperature range\")) + (R.margin === null ? \"\" : \" \u00b7 \" + fAllD(R.margin));\n    renderGauge(inp, R);\n    el.kOp.textContent = fT(inp.opC, u); el.kOpS.textContent = fAll(inp.opC);\n    el.kMax.textContent = fT(inp.maxC, u); el.kMaxS.textContent = inp.maxC === null ? \"Not entered: insufficient data\" : (state.example ? \"Hypothetical example value\" : (state.refMax ? \"Typical published guidance: verify\" : \"User-entered\"));\n    el.kMin.textContent = inp.minC === null ? \"Not set\" : fT(inp.minC, u); el.kMinS.textContent = inp.minC === null ? \"Optional: low-temperature check skipped\" : \"Margin above minimum: \" + fD(R.marginMin, u);\n    el.kPct.textContent = R.pct === null ? \"n\/a\" : fmt(R.pct, 2) + \"%\";\n    el.kPctS.textContent = R.pct === null ? \"Needs both verified minimum and maximum (max > min)\" : \"Remaining Percentage of Specified Operating Temperature Range\";\n    el.kCat.textContent = R.category;\n    tableRows(el.conv, [\n      [\"Operating temperature\", fAll(inp.opC)],\n      [\"Maximum allowable temperature\", fAll(inp.maxC)],\n      [\"Minimum allowable temperature\", inp.minC === null ? \"Not set\" : fAll(inp.minC)],\n      [\"Temperature margin (difference)\", fAllD(R.margin)]\n    ]);\n    state.last = { inp: inp, R: R };\n  }\n  \/* =====================================================================\n     UNIT SWITCHING (absolute values vs. differences)\n     ===================================================================== *\/\n  function convertField(input, from, to, isDelta) {\n    var v = num(input);\n    if (v === null ? true : isNaN(v)) { return; }\n    var c = isDelta ? dToC(v, from) : toC(v, from);\n    input.value = inputStr(isDelta ? dFromC(c, to) : fromC(c, to));\n  }\n  function onUnitChange() {\n    var from = state.unit, to = el.unit.value;\n    if (from === to) { return; }\n    [el.op, el.min, el.max].forEach(function (i) { convertField(i, from, to, false); });\n    convertField(el.alert, from, to, true);\n    state.unit = to;\n    render();\n  }\n  function toast(msg) { el.toast.textContent = msg; el.toast.classList.add(\"mtrc-show\"); clearTimeout(state.toastT); state.toastT = setTimeout(function () { el.toast.classList.remove(\"mtrc-show\"); }, 2300); }\n  \/* =====================================================================\n     INIT \/ EVENTS\n     ===================================================================== *\/\n  function setValues(v) {\n    el.cat.value = v.cat; el.search.value = v.search; buildMatOptions(v.mat);\n    el.unit.value = v.unit; state.unit = v.unit;\n    el.exp.value = v.exp;\n    applyMaterial();\n    el.custom.value = v.custom; el.grade.value = v.grade; el.op.value = v.op;\n    if (v.max !== null) { el.max.value = v.max; el.min.value = v.min; state.refMax = false; state.refMin = false; }\n    el.confirm.checked = v.confirm; el.alert.value = v.alert; el.dur.value = v.dur; el.durUnit.value = v.durUnit;\n    el.env.value = v.env; el.envc.value = v.envc; el.load.value = v.load; el.notes.value = v.notes;\n    if (v.src !== undefined) { el.src.value = v.src; state.refSrc = false; }\n    el.customWrap.hidden = !(currentMat() ? currentMat().custom : false);\n  }\n  \/* Results stay hidden until Calculate is clicked; afterwards they update live as inputs change. *\/\n  function onCalculate() {\n    render();\n    if (!state.last) { var bad = root.querySelector(\".mtrc-form .mtrc-invalid\"); if (bad) { bad.focus(); } return; }\n    el.results.hidden = false;\n    try { el.results.focus({ preventScroll: true }); } catch (e) { \/* ignore *\/ }\n    el.results.scrollIntoView({ behavior: \"smooth\", block: \"start\" });\n  }\n  \/* Events: real-time recalculation on every change *\/\n  el.cat.addEventListener(\"change\", function () { var keep = el.mat.value; var id = buildMatOptions(keep); if (id !== keep) { applyMaterial(); } render(); });\n  el.search.addEventListener(\"input\", function () { var keep = el.mat.value; var id = buildMatOptions(keep); if (id !== keep ? !!id : false) { applyMaterial(); } render(); });\n  el.mat.addEventListener(\"change\", function () { applyMaterial(); render(); });\n  el.unit.addEventListener(\"change\", onUnitChange);\n  el.exp.addEventListener(\"change\", function () { var m = currentMat(); if (state.refMax ? !!m : false) { el.max.value = inputStr(fromC(refMax(m, el.exp.value), state.unit)); } render(); });\n  el.max.addEventListener(\"input\", function () { state.refMax = false; state.example = false; render(); });\n  el.min.addEventListener(\"input\", function () { state.refMin = false; render(); });\n  el.src.addEventListener(\"input\", function () { state.refSrc = false; render(); });\n  [el.op, el.alert, el.dur, el.custom, el.grade, el.envc, el.notes].forEach(function (i) { i.addEventListener(\"input\", render); });\n  [el.durUnit, el.env, el.load, el.confirm].forEach(function (i) { i.addEventListener(\"change\", render); });\n  el.calc.addEventListener(\"click\", onCalculate);\n  root.querySelector(\".mtrc-form\").addEventListener(\"keydown\", function (e) { if (e.key === \"Enter\" ? (e.target ? e.target.tagName === \"INPUT\" : false) : false) { e.preventDefault(); onCalculate(); } });\n  \/* Init *\/\n  buildCatOptions();\n  setValues(DEFAULTS);\n  render();\n})();\n<\/script>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>The Material Temperature Resistance Rating Calculator is a practical online tool designed to help engineers, manufacturers, and material specialists evaluate the temperature resistance of different&#8230;<\/p>","protected":false},"author":2,"featured_media":24989,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"pmpro_default_level":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[8647],"tags":[8788,8509,8790,8789],"class_list":["post-24988","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-materials-science-and-properties","tag-heat-resistance","tag-material-selection","tag-material-temperature","tag-temperature-resistance","pmpro-has-access"],"acf":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/www.mechstream.com\/wp-content\/uploads\/2026\/10\/Material-Temperature-Resistance-Rating-Calculator.png","_links":{"self":[{"href":"https:\/\/www.mechstream.com\/ar\/wp-json\/wp\/v2\/posts\/24988","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mechstream.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.mechstream.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.mechstream.com\/ar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mechstream.com\/ar\/wp-json\/wp\/v2\/comments?post=24988"}],"version-history":[{"count":1,"href":"https:\/\/www.mechstream.com\/ar\/wp-json\/wp\/v2\/posts\/24988\/revisions"}],"predecessor-version":[{"id":24990,"href":"https:\/\/www.mechstream.com\/ar\/wp-json\/wp\/v2\/posts\/24988\/revisions\/24990"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.mechstream.com\/ar\/wp-json\/wp\/v2\/media\/24989"}],"wp:attachment":[{"href":"https:\/\/www.mechstream.com\/ar\/wp-json\/wp\/v2\/media?parent=24988"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.mechstream.com\/ar\/wp-json\/wp\/v2\/categories?post=24988"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.mechstream.com\/ar\/wp-json\/wp\/v2\/tags?post=24988"}],"curies":[{"name":"\u0648\u0648\u0631\u062f\u0628\u0631\u064a\u0633","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}