{"id":100214,"date":"2026-02-15T20:27:46","date_gmt":"2026-02-15T20:27:46","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100214"},"modified":"2026-04-05T15:34:56","modified_gmt":"2026-04-05T15:34:56","slug":"rubber-mount-calculator","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/bn\/calculators\/rubber-mount-calculator\/","title":{"rendered":"Rubber Mount Calculator \u2014 Shore A Hardness to Stiffness"},"content":{"rendered":"\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Rubber Mount Calculator\",\"alternateName\":[\"Rubber Isolator Calculator\",\"Elastomer Mount Calculator\",\"Shore Hardness Stiffness Calculator\"],\"description\":\"Free online calculator for rubber vibration isolator properties. Convert Shore A hardness and dimensions to stiffness, natural frequency, and static deflection.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/rubber-mount-calculator\/\",\"applicationCategory\":\"Engineering Calculator\",\"operatingSystem\":\"Any (Web Browser)\",\"offers\":{\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"EUR\"},\"creator\":{\"@type\":\"Organization\",\"name\":\"Vibromera\",\"url\":\"https:\/\/vibromera.eu\/\"},\"datePublished\":\"2024-01-01\",\"dateModified\":\"2025-02-14\",\"inLanguage\":\"en\",\"isAccessibleForFree\":true,\"featureList\":[\"Shore A hardness 30-90\",\"Young's modulus estimation\",\"Compression stiffness\",\"Natural frequency\",\"Static deflection\",\"Auto-calculation\"],\"keywords\":\"rubber mount, shore hardness, stiffness, natural frequency, elastomer, vibration isolator\"}\n<\/script>\n\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[\n{\"@type\":\"Question\",\"name\":\"How is Young's modulus estimated from Shore A hardness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Several empirical formulas exist. A common approximation: E \u2248 0.0981\u00d7(56+7.62336\u00d7S)\/(0.137505\u00d7(254\u22122.54\u00d7S)) MPa, where S is Shore A hardness. This gives E from ~1 MPa at Shore 30A to ~15+ MPa at Shore 90A.\"}},\n{\"@type\":\"Question\",\"name\":\"What Shore A hardness should I choose?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Shore 40-50A: Soft mounts for sensitive equipment, good isolation. Shore 55-65A: General purpose, most common. Shore 70-80A: Stiff mounts for heavy loads, less isolation. Shore 85-90A: Very stiff, minimal deflection.\"}},\n{\"@type\":\"Question\",\"name\":\"What is the shape factor and why does it matter?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Shape factor S = loaded area \/ force-free area. For a cylinder: S = D\/(4h). Higher shape factors increase effective stiffness because rubber is nearly incompressible. The compression modulus Ec = E\u00d7(1 + 2\u03baS\u00b2), where \u03ba depends on the rubber compound.\"}},\n{\"@type\":\"Question\",\"name\":\"Can I use this for shear mounts?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This calculator assumes compression loading. For shear-loaded mounts, the shear stiffness is approximately k_shear = GA\/h where G \u2248 E\/3 for rubber (Poisson's ratio ~0.5). Shear stiffness is typically 3-5\u00d7 lower than compression stiffness.\"}},\n{\"@type\":\"Question\",\"name\":\"How does temperature affect rubber mount properties?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Rubber stiffens significantly at low temperatures. Natural rubber (NR) works well from -40\u00b0C to +70\u00b0C. Neoprene (CR): -30\u00b0C to +100\u00b0C. Silicone: -60\u00b0C to +200\u00b0C. Stiffness can increase 2-5\u00d7 below -20\u00b0C.\"}}\n]}\n<\/script>\n\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"BreadcrumbList\",\"itemListElement\":[\n{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/vibromera.eu\/\"},\n{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Calculators\",\"item\":\"https:\/\/vibromera.eu\/calculators\/\"},\n{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Rubber Mount Calculator\",\"item\":\"https:\/\/vibromera.eu\/calculators\/rubber-mount-calculator\/\"}\n]}\n<\/script>\n\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n\n<link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin>\n\n<link 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16px;font-size:13px;color:var(--vc-ink-muted)}.vc-footer a{color:var(--vc-accent);text-decoration:none}.vc-footer a:hover{text-decoration:underline}.vc-footer-links{margin-top:8px;font-size:12px}.vc-footer-links a{margin:0 8px}@media print{.vc-section-body{max-height:none!important}.vc-faq-a{max-height:none!important}.vc-results{max-height:none!important;padding:24px!important}.vc-copy-btn,.vc-section-chevron,.vc-faq-chevron,.vc-presets,.vc-promo{display:none!important}}\n<\/style>\n\n<div class=\"vc-calculator\" id=\"vc-rubber-mount\">\n\n<header class=\"vc-header\">\n    <p class=\"vc-header-eyebrow\">Free Engineering Tool #065<\/p>\n    <h1 class=\"vc-header-title\">Rubber Mount Calculator<\/h1>\n    <p class=\"vc-header-subtitle\">Calculate rubber vibration isolator stiffness from Shore A hardness (30\u201390A), mount dimensions, and static load. Determine natural frequency and static deflection.<\/p>\n    <div class=\"vc-badges\"><span class=\"vc-badge\">Shore 30A\u201390A<\/span><span class=\"vc-badge\">Compression Stiffness<\/span><span class=\"vc-badge\">Auto-Calc<\/span><\/div>\n<\/header>\n\n<div class=\"vc-card\">\n    <div class=\"vc-unit-bar\">\n        <button type=\"button\" class=\"vc-unit-btn vc-active\" data-system=\"metric\">Metric (mm, kg, N\/mm)<\/button>\n        <button type=\"button\" class=\"vc-unit-btn\" data-system=\"imperial\">Imperial (in, lb, lbf\/in)<\/button>\n    <\/div>\n    <form class=\"vc-form\" id=\"vc-form\" autocomplete=\"off\">\n        <div class=\"vc-form-grid\">\n            <div class=\"vc-field\">\n                <label class=\"vc-label\" for=\"vc-shore\">Shore A Hardness <span class=\"vc-label-hint\">(30\u201390)<\/span><\/label>\n                <input class=\"vc-input\" type=\"number\" id=\"vc-shore\" inputmode=\"decimal\" step=\"1\" min=\"30\" max=\"90\" placeholder=\"e.g. 55\" value=\"55\">\n            <\/div>\n            <div class=\"vc-field\">\n                <label class=\"vc-label\" for=\"vc-dia\">Mount Diameter <span class=\"vc-label-hint\" id=\"vc-dia-unit\">(mm)<\/span><\/label>\n                <input class=\"vc-input\" type=\"number\" id=\"vc-dia\" inputmode=\"decimal\" step=\"any\" min=\"1\" placeholder=\"e.g. 75\" value=\"75\">\n            <\/div>\n            <div class=\"vc-field\">\n                <label class=\"vc-label\" for=\"vc-height\">Mount Height <span class=\"vc-label-hint\" id=\"vc-h-unit\">(mm)<\/span><\/label>\n                <input class=\"vc-input\" type=\"number\" id=\"vc-height\" inputmode=\"decimal\" step=\"any\" min=\"1\" placeholder=\"e.g. 40\" value=\"40\">\n            <\/div>\n            <div class=\"vc-field\">\n                <label class=\"vc-label\" for=\"vc-load\">Static Load <span class=\"vc-label-hint\" id=\"vc-load-unit\">(kg)<\/span><\/label>\n                <input class=\"vc-input\" type=\"number\" id=\"vc-load\" inputmode=\"decimal\" step=\"any\" min=\"0.1\" placeholder=\"e.g. 100\" value=\"100\">\n            <\/div>\n        <\/div>\n        <div class=\"vc-presets\">\n            <div class=\"vc-presets-label\">Quick presets<\/div>\n            <button type=\"button\" class=\"vc-preset-btn\" data-sh=\"40\" data-d=\"50\" data-h=\"30\" data-l=\"50\">Soft \u00d850\u00d730 Shore 40A<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-sh=\"55\" data-d=\"75\" data-h=\"40\" data-l=\"100\">Medium \u00d875\u00d740 Shore 55A<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-sh=\"70\" data-d=\"100\" data-h=\"50\" data-l=\"250\">Stiff \u00d8100\u00d750 Shore 70A<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-sh=\"60\" data-d=\"150\" data-h=\"75\" data-l=\"500\">Heavy \u00d8150\u00d775 Shore 60A<\/button>\n        <\/div>\n    <\/form>\n    <div class=\"vc-results\" id=\"vc-results\">\n        <div class=\"vc-results-head\">\n            <h2 class=\"vc-results-title\">Results<\/h2>\n            <button type=\"button\" class=\"vc-copy-btn\" id=\"vc-copy-btn\"><svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><rect x=\"9\" y=\"9\" width=\"13\" height=\"13\" rx=\"2\"\/><path d=\"M5 15H4a2 2 0 01-2-2V4a2 2 0 012-2h9a2 2 0 012 2v1\"\/><\/svg> Copy<\/button>\n        <\/div>\n        <div class=\"vc-result-grid\">\n            <div class=\"vc-rcard vc-rcard-primary\">\n                <div class=\"vc-rcard-label\">Axial Compression Stiffness<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-k\">\u2014<\/div>\n            <\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Young&#8217;s Modulus E (estimated)<\/div><div class=\"vc-rcard-value\" id=\"vc-r-E\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Natural Frequency<\/div><div class=\"vc-rcard-value\" id=\"vc-r-fn\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Static Deflection<\/div><div class=\"vc-rcard-value\" id=\"vc-r-defl\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Shape Factor<\/div><div class=\"vc-rcard-value\" id=\"vc-r-sf\">\u2014<\/div><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n\n<div class=\"vc-section vc-open\" id=\"vc-sec-theory\">\n    <button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"true\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\ud83d\udcd8<\/span><span class=\"vc-section-title\">Theory &amp; Formulas<\/span><\/span><svg class=\"vc-section-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button>\n    <div class=\"vc-section-body\"><div class=\"vc-section-inner vc-theory\">\n        <h3>Shore A to Young&#8217;s Modulus<\/h3>\n        <p>Empirical relation (Gent, 1958):<\/p>\n        <div class=\"vc-formula-box\" id=\"vc-katex-1\"><\/div>\n        <h3>Shape Factor<\/h3>\n        <div class=\"vc-formula-box\" id=\"vc-katex-2\"><\/div>\n        <h3>Compression Stiffness<\/h3>\n        <p>Accounting for shape factor (rubber is nearly incompressible, \u03ba \u2248 0.93):<\/p>\n        <div class=\"vc-formula-box\" id=\"vc-katex-3\"><\/div>\n        <h3>Natural Frequency<\/h3>\n        <div class=\"vc-formula-box\" id=\"vc-katex-4\"><\/div>\n        <table class=\"vc-table\">\n            <thead><tr><th>Shore A<\/th><th>E (approx. MPa)<\/th><th>Typical Use<\/th><\/tr><\/thead>\n            <tbody>\n                <tr><td>30A<\/td><td>~0.9<\/td><td>Very soft pads<\/td><\/tr>\n                <tr><td>40A<\/td><td>~1.5<\/td><td>Soft isolation<\/td><\/tr>\n                <tr><td>55A<\/td><td>~3.0<\/td><td>General purpose<\/td><\/tr>\n                <tr><td>70A<\/td><td>~6.2<\/td><td>Stiff mounts<\/td><\/tr>\n                <tr><td>90A<\/td><td>~18<\/td><td>Very stiff<\/td><\/tr>\n            <\/tbody>\n        <\/table>\n        <div class=\"vc-warning-box\"><p style=\"margin:0;font-size:14px;color:var(--vc-ink-secondary);\"><strong>\u26a0\ufe0f Note:<\/strong> Shore-to-modulus conversion is approximate. Actual stiffness depends on rubber compound, temperature, and loading conditions. Always verify with manufacturer data.<\/p><\/div>\n    <\/div><\/div>\n<\/div>\n\n<div class=\"vc-section\" id=\"vc-sec-related\"><button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"false\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\ud83d\udd17<\/span><span class=\"vc-section-title\">Related Calculators<\/span><\/span><svg class=\"vc-section-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button><div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div class=\"vc-related\">\n    <a class=\"vc-related-link\" href=\"\/calculators\/vibration-mount-selection\/\">Vibration Mount Selection<\/a>\n    <a class=\"vc-related-link\" href=\"\/calculators\/machine-vibration-isolation\/\">Machine Vibration Isolation<\/a>\n    <a class=\"vc-related-link\" href=\"\/calculators\/damping-ratio-calculator\/\">Damping Ratio Calculator<\/a>\n    <a class=\"vc-related-link\" href=\"\/calculators\/compression-spring-design\/\">Compression Spring Design<\/a>\n<\/div><\/div><\/div><\/div>\n\n<div class=\"vc-section\" id=\"vc-sec-faq\"><button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"false\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\u2753<\/span><span class=\"vc-section-title\">Frequently Asked Questions<\/span><\/span><svg class=\"vc-section-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button><div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div class=\"vc-faq-list\" id=\"vc-faq-list\"><\/div><\/div><\/div><\/div>\n\n<div class=\"vc-promo\"><div class=\"vc-promo-text\"><strong>Vibromera \u2014 Portable Balancing &amp; Vibration Analysis<\/strong><br>Professional field balancing instruments and software. Used in 50+ countries.<\/div><a class=\"vc-promo-link\" href=\"https:\/\/vibromera.eu\/\" target=\"_blank\" rel=\"noopener\">Learn More<\/a><\/div>\n\n<footer class=\"vc-footer\"><p>\u00a9 2024\u20132025 <a href=\"https:\/\/vibromera.eu\/\">Vibromera<\/a> \u2014 Engineering Calculators<\/p><p style=\"font-size:12px;margin-top:4px;\">Rubber mount properties. Last updated: February 2025<\/p><div class=\"vc-footer-links\"><a href=\"\/calculators\/engineering-calculators\/\">All Calculators<\/a><a href=\"https:\/\/vibromera.eu\/contacts\/\">Contact<\/a><\/div><\/footer>\n\n<\/div>\n\n<script src=\"https:\/\/cdn.jsdelivr.net\/npm\/katex@0.16.11\/dist\/katex.min.js\"><\/script>\n<script>\n(function(){\n    'use strict';\n    var SLUG='rubber-mount-calculator', unitSystem='metric';\n    function $(id){return document.getElementById(id)}\n    function fmt(n,d){if(isNaN(n)||!isFinite(n))return'\u2014';var f=n.toFixed(d===undefined?2:d);return f.replace(\/(\\.\\d*?)0+$\/,'$1').replace(\/\\.$\/,'')}\n\n    \/\/ Shore A -> Young's modulus (MPa) using Gent's approximation\n    function shoreToE(s) {\n        return 0.0981 * (56 + 7.62336 * s) \/ (0.137505 * (254 - 2.54 * s));\n    }\n\n    function calculate(){\n        var shore=parseFloat($('vc-shore').value);\n        var dia=parseFloat($('vc-dia').value);\n        var h=parseFloat($('vc-height').value);\n        var load=parseFloat($('vc-load').value);\n        if(!shore||shore<30||shore>90||!dia||dia<=0||!h||h<=0||!load||load<=0){$('vc-results').classList.remove('vc-visible');return}\n\n        var diaMm=unitSystem==='imperial'?dia*25.4:dia;\n        var hMm=unitSystem==='imperial'?h*25.4:h;\n        var loadKg=unitSystem==='imperial'?load*0.453592:load;\n\n        var E=shoreToE(shore); \/\/ MPa\n        var A=Math.PI*Math.pow(diaMm\/2,2); \/\/ mm\u00b2\n        var shapeFactor=diaMm\/(4*hMm);\n        var kappa=0.93;\n        var Ec=E*(1+2*kappa*shapeFactor*shapeFactor); \/\/ effective modulus MPa\n        var k=Ec*A\/hMm; \/\/ N\/mm\n        var staticDefl=loadKg*9.81\/k; \/\/ mm\n        var fn=1\/(2*Math.PI)*Math.sqrt(k\/(loadKg)); \/\/ Hz (k in N\/mm, mass in kg \u2192 need k in N\/m)\n        fn = 1\/(2*Math.PI)*Math.sqrt(k*1000\/loadKg);\n\n        if(unitSystem==='imperial'){\n            $('vc-r-k').innerHTML=fmt(k*0.00571015,2)+' <span class=\"vc-rcard-unit\">lbf\/in<\/span>';\n            $('vc-r-defl').innerHTML=fmt(staticDefl\/25.4,4)+' <span class=\"vc-rcard-unit\">in<\/span>';\n        } else {\n            $('vc-r-k').innerHTML=fmt(k,1)+' <span class=\"vc-rcard-unit\">N\/mm<\/span>';\n            $('vc-r-defl').innerHTML=fmt(staticDefl,2)+' <span class=\"vc-rcard-unit\">mm<\/span>';\n        }\n        $('vc-r-E').innerHTML=fmt(E,2)+' <span class=\"vc-rcard-unit\">MPa<\/span>';\n        $('vc-r-fn').innerHTML=fmt(fn,2)+' <span class=\"vc-rcard-unit\">Hz<\/span>';\n        $('vc-r-sf').innerHTML=fmt(shapeFactor,3);\n        $('vc-results').classList.add('vc-visible');\n\n        var u=new URL(window.location);u.searchParams.set('shore',shore);u.searchParams.set('dia',dia);u.searchParams.set('height',h);u.searchParams.set('load',load);history.replaceState(null,'',u.toString());\n        saveHistory({shore:shore,dia:dia,h:h,load:load,_summary:'Shore '+shore+'A, \u00d8'+dia+'\u00d7'+h+', '+load+(unitSystem==='imperial'?' lb':' kg')});\n    }\n\n    var unitBtns=document.querySelectorAll('.vc-unit-btn');\n    unitBtns.forEach(function(btn){btn.addEventListener('click',function(){unitBtns.forEach(function(b){b.classList.remove('vc-active')});this.classList.add('vc-active');unitSystem=this.getAttribute('data-system');var imp=unitSystem==='imperial';$('vc-dia-unit').textContent=imp?'(in)':'(mm)';$('vc-h-unit').textContent=imp?'(in)':'(mm)';$('vc-load-unit').textContent=imp?'(lb)':'(kg)';try{localStorage.setItem('vc_units',unitSystem)}catch(e){}calculate()})});\n\n    document.querySelectorAll('.vc-preset-btn').forEach(function(btn){btn.addEventListener('click',function(e){e.preventDefault();$('vc-shore').value=this.getAttribute('data-sh');var d=parseFloat(this.getAttribute('data-d')),hh=parseFloat(this.getAttribute('data-h')),l=parseFloat(this.getAttribute('data-l'));$('vc-dia').value=unitSystem==='imperial'?fmt(d\/25.4,2):d;$('vc-height').value=unitSystem==='imperial'?fmt(hh\/25.4,2):hh;$('vc-load').value=unitSystem==='imperial'?fmt(l*2.20462,1):l;calculate()})});\n\n    $('vc-form').addEventListener('input',calculate);$('vc-form').addEventListener('change',calculate);\n\n    $('vc-copy-btn').addEventListener('click',function(){var text='Rubber Mount Calculator\\n\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\\nShore: '+$('vc-shore').value+'A\\nDiameter: '+$('vc-dia').value+'\\nHeight: '+$('vc-height').value+'\\nLoad: '+$('vc-load').value+'\\nStiffness: '+$('vc-r-k').textContent+'\\nNatural Freq: '+$('vc-r-fn').textContent+'\\nDeflection: '+$('vc-r-defl').textContent+'\\n\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\\nvibromera.eu\/calculators\/'+SLUG+'\/';if(navigator.clipboard){navigator.clipboard.writeText(text).then(function(){var b=$('vc-copy-btn');b.classList.add('vc-copied');b.innerHTML='<svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><polyline points=\"20 6 9 17 4 12\"\/><\/svg> Copied!';setTimeout(function(){b.classList.remove('vc-copied');b.innerHTML='<svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><rect x=\"9\" y=\"9\" width=\"13\" height=\"13\" rx=\"2\"\/><path d=\"M5 15H4a2 2 0 01-2-2V4a2 2 0 012-2h9a2 2 0 012 2v1\"\/><\/svg> Copy'},2000)})}});\n\n    document.querySelectorAll('.vc-section-toggle').forEach(function(btn){btn.addEventListener('click',function(){var s=this.closest('.vc-section');s.classList.toggle('vc-open');this.setAttribute('aria-expanded',s.classList.contains('vc-open'))})});\n\n    var faqData=[\n        {q:'How is Young\\'s modulus estimated from Shore A hardness?',a:'<p>Using Gent\\'s empirical relation: E \u2248 0.0981\u00d7(56+7.62336\u00d7S)\/(0.137505\u00d7(254\u22122.54\u00d7S)) MPa. This gives approximately 1 MPa at Shore 30A up to 18 MPa at Shore 90A.<\/p>'},\n        {q:'What Shore A hardness should I choose?',a:'<p>Shore 40\u201350A: soft, good isolation. Shore 55\u201365A: general purpose. Shore 70\u201380A: stiff, heavy loads. Shore 85\u201390A: very stiff, minimal deflection.<\/p>'},\n        {q:'What is the shape factor and why does it matter?',a:'<p>Shape factor S = D\/(4h) for cylindrical mounts. Higher S increases effective stiffness because rubber is nearly incompressible. The compression modulus E<sub>c<\/sub> = E(1 + 2\u03baS\u00b2).<\/p>'},\n        {q:'Can I use this for shear mounts?',a:'<p>This calculator assumes compression. For shear mounts, k<sub>shear<\/sub> \u2248 GA\/h where G \u2248 E\/3. Shear stiffness is typically 3\u20135\u00d7 lower than compression.<\/p>'},\n        {q:'How does temperature affect rubber mount properties?',a:'<p>Rubber stiffens at low temperatures. NR: \u221240 to +70\u00b0C. Neoprene: \u221230 to +100\u00b0C. Silicone: \u221260 to +200\u00b0C. Stiffness can increase 2\u20135\u00d7 below \u221220\u00b0C.<\/p>'}\n    ];\n    var faqList=$('vc-faq-list');faqData.forEach(function(faq){faqList.innerHTML+='<div class=\"vc-faq-item\"><button type=\"button\" class=\"vc-faq-q\"><span>'+faq.q+'<\/span><svg class=\"vc-faq-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button><div class=\"vc-faq-a\"><div class=\"vc-faq-a-inner\">'+faq.a+'<\/div><\/div><\/div>'});\n    faqList.addEventListener('click',function(e){var b=e.target.closest('.vc-faq-q');if(b)b.closest('.vc-faq-item').classList.toggle('vc-open')});\n\n    function saveHistory(entry){var key='vc_history_'+SLUG;var arr=[];try{arr=JSON.parse(localStorage.getItem(key))||[]}catch(e){}entry._ts=new Date().toISOString();arr.unshift(entry);if(arr.length>10)arr=arr.slice(0,10);try{localStorage.setItem(key,JSON.stringify(arr))}catch(e){}}\n    function loadParams(){var p=new URLSearchParams(window.location.search);p.forEach(function(v,k){var el=$(k)||$('vc-'+k);if(el)el.value=v})}\n\n    function renderFormulas(){try{\n        katex.render('E \\\\approx \\\\frac{0.0981(56 + 7.62336 \\\\cdot S)}{0.137505(254 - 2.54 \\\\cdot S)} \\\\quad [\\\\text{MPa}]',$('vc-katex-1'),{displayMode:true,throwOnError:false});\n        katex.render('S_f = \\\\frac{D}{4h}',$('vc-katex-2'),{displayMode:true,throwOnError:false});\n        katex.render('k = \\\\frac{E_c \\\\cdot A}{h}, \\\\quad E_c = E(1 + 2\\\\kappa S_f^2)',$('vc-katex-3'),{displayMode:true,throwOnError:false});\n        katex.render('f_n = \\\\frac{1}{2\\\\pi}\\\\sqrt{\\\\frac{k}{m}} \\\\quad [\\\\text{Hz}]',$('vc-katex-4'),{displayMode:true,throwOnError:false});\n    }catch(e){}}\n\n    function init(){try{var saved=localStorage.getItem('vc_units');if(saved==='imperial'){unitSystem='imperial';unitBtns.forEach(function(b){b.classList.toggle('vc-active',b.getAttribute('data-system')==='imperial')})}}catch(e){}loadParams();renderFormulas();calculate()}\n    if(document.readyState==='loading')document.addEventListener('DOMContentLoaded',init);else init();\n})();\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>\u09ac\u09bf\u09a8\u09be\u09ae\u09c2\u09b2\u09cd\u09af\u09c7 \u0985\u09a8\u09b2\u09be\u0987\u09a8 \u09b0\u09be\u09ac\u09be\u09b0 \u09ae\u09be\u0989\u09a8\u09cd\u099f \u0995\u09cd\u09af\u09be\u09b2\u0995\u09c1\u09b2\u09c7\u099f\u09b0\u0964 Shore A \u0995\u09a0\u09cb\u09b0\u09a4\u09be, \u09ae\u09be\u0989\u09a8\u09cd\u099f \u09ae\u09be\u09a4\u09cd\u09b0\u09be \u098f\u09ac\u0982 \u09b8\u09cd\u09a5\u09bf\u09b0 \u09b2\u09cb\u09a1 \u09aa\u09cd\u09b0\u09ac\u09c7\u09b6 \u0995\u09b0\u09c1\u09a8 \u098f\u09ac\u0982 \u09b0\u09be\u09ac\u09be\u09b0 \u0995\u09ae\u09cd\u09aa\u09a8 \u09ac\u09bf\u099a\u09cd\u099b\u09bf\u09a8\u09cd\u09a8\u0995\u09be\u09b0\u09c0\u09b0 \u099c\u09a8\u09cd\u09af \u0995\u09a0\u09cb\u09b0\u09a4\u09be, \u09aa\u09cd\u09b0\u09be\u0995\u09c3\u09a4\u09bf\u0995 \u09ab\u09cd\u09b0\u09bf\u0995\u09cb\u09af\u09bc\u09c7\u09a8\u09cd\u09b8\u09bf \u098f\u09ac\u0982 \u09b8\u09cd\u09a5\u09bf\u09b0 \u09ac\u09bf\u099a\u09cd\u09af\u09c1\u09a4\u09bf \u0997\u09a3\u09a8\u09be \u0995\u09b0\u09c1\u09a8\u0964<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-100214","calculator","type-calculator","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator\/100214","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator"}],"about":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/types\/calculator"}],"version-history":[{"count":3,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator\/100214\/revisions"}],"predecessor-version":[{"id":100912,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator\/100214\/revisions\/100912"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/media?parent=100214"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/categories?post=100214"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/tags?post=100214"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}