{"id":84074,"date":"2024-12-13T12:57:06","date_gmt":"2024-12-13T12:57:06","guid":{"rendered":"https:\/\/www.ecoonline.com\/glossary\/flammability-2\/"},"modified":"2025-04-16T12:50:45","modified_gmt":"2025-04-16T12:50:45","slug":"flammability","status":"publish","type":"glossary-item","link":"https:\/\/www.ecoonline.com\/en-us\/glossary\/flammability\/","title":{"rendered":"Flammability Meaning &amp; Definition"},"content":{"rendered":"\n<section class=\"Pegasus__Container w-full   relative h-fit  text-content-dark mobile-stacking-standard is-layout-flow wp-block-pegasus-container-is-layout-flow\" style=\"   \" >\n\t        \n\t\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t        \t\t\n\t\t\n\t\n\t\t\t<div class=\"relative h-full is-flex-layout flex flex-col justify-start  container\">\n\n<h2 class=\"wp-block-heading\">What is Flammability?<\/h2>\n\n\n\n<p>Flammability is a measure of how quickly a specific material is capable of catching fire and burning. It indicates the ease with which a material can ignite and the intensity with which it burns once it catches on fire.<\/p>\n\n\n\n<p><a href=\"\/en-us\/glossary\/material-safety-data-sheet\">Materials<\/a> that are highly flammable must be treated with extra care, as they can combust quickly. To accurately determine the flammability of a material, fire testing is often conducted. In normal terms, materials are often rated as either:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Highly flammable<\/li>\n\n\n\n<li>Flammable<\/li>\n\n\n\n<li>Non-flammable<\/li>\n<\/ul>\n\n\n\n<p>The <a href=\"https:\/\/www.thechemicalsafetyassociation.org\/post\/ghs-safety-data-sheets-explained-section-9\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">safety data sheet<\/a> often contains a list of all the physical and chemical properties of materials used in the workplace, and <a href=\"https:\/\/www.thechemicalsafetyassociation.org\/post\/ghs-safety-data-sheets-explained-section-9\">section 9<\/a> generally contains information about the item\u2019s flammability.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/www.ecoonline.com\/wp-content\/uploads\/2024\/12\/image-28-1024x1024.webp\" alt=\"image\" class=\"wp-image-88980\" style=\"width:1024px;height:auto\" srcset=\"https:\/\/www.ecoonline.com\/wp-content\/uploads\/2024\/12\/image-28-1024x1024.webp 1024w, https:\/\/www.ecoonline.com\/wp-content\/uploads\/2024\/12\/image-28-300x300.webp 300w, https:\/\/www.ecoonline.com\/wp-content\/uploads\/2024\/12\/image-28-150x150.webp 150w, https:\/\/www.ecoonline.com\/wp-content\/uploads\/2024\/12\/image-28-768x768.webp 768w, https:\/\/www.ecoonline.com\/wp-content\/uploads\/2024\/12\/image-28-1536x1536.webp 1536w, https:\/\/www.ecoonline.com\/wp-content\/uploads\/2024\/12\/image-28-1080x1080.webp 1080w, https:\/\/www.ecoonline.com\/wp-content\/uploads\/2024\/12\/image-28-360x360.webp 360w, https:\/\/www.ecoonline.com\/wp-content\/uploads\/2024\/12\/image-28-640x640.webp 640w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\">\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-large-font-size\">Reduce The Risk Of Fire In The Workplace<\/h3>\n\n\n\n<p class=\"has-text-align-center\">Learn about minimising the risk of fire hazards in the workplace. Download our FREE&nbsp;<strong>Fire Hazard Awareness in Your Workplace&nbsp;<\/strong>poster.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-a89b3969 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button is-style-large-arrow-fill-jade is-style-large-arrow-fill-jade--1\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/cta-eu1.hubspot.com\/web-interactives\/public\/v1\/track\/click?encryptedPayload=AVxigLLwaeKY9LflMlTe91uVSQNRT0Wjpb8BhDY2v2RXmJxbBBuvg2g1OE2Iz5iT7gjs17ObSdbY4R8xJSoD%2BQu6l8cn828D4RKTUOOuSzfiIx2cmZgpVghJ%2Fu8CBKeAOU1Wfp2jyEnlpurufoq%2F7T15BNvVkafvMKE0%2Ba30%2Fmq0oPLRfUPnOcbyuBo6KdzwgcxCX%2Ba7NmQBPdyn&amp;portalId=144606870&amp;webInteractiveId=164054796509&amp;webInteractiveContentId=118496709353&amp;containerType=EMBEDDED&amp;pageUrl=https%3A%2F%2Fwww.ecoonline.com%2Fen-us%2Fglossary%2Fflammability&amp;pageTitle=Flammability+Meaning+%26+Definition+%7C+EcoOnline+US&amp;referrer=&amp;userAgent=Mozilla%2F5.0+%28X11%3B+Linux+x86_64%29+AppleWebKit%2F537.36+%28KHTML%2C+like+Gecko%29+Chrome%2F132.0.0.0+Safari%2F537.36&amp;hutk=c88aeb06e85236c6f2dc792c8f8a10f4&amp;hssc=205882892.7.1737379089367&amp;hstc=205882892.c88aeb06e85236c6f2dc792c8f8a10f4.1737379089367.1737379089367.1737379089367.1&amp;pageId=112662979809&amp;analyticsPageId=112662979809&amp;hsfp=36944505&amp;canonicalUrl=http%3A%2F%2Fwww.ecoonline.com%2Fen-us%2Fglossary%2Fflammability&amp;contentType=standard-page\">Download Now for a Safer Environment!<\/a><\/div>\n<\/div>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Why Is It Important to Conduct Flammability Testing?<\/h2>\n\n\n\n<p>It\u2019s very important to determine the flammability of a substance to burn to ensure the safety of employees on a work site or in a factory. There are many materials that are highly flammable, as long as certain conditions are met.<\/p>\n\n\n\n<p>Therefore, depending upon the conditions, properties can change. Once a material or chemical ignites, it can then sustain combustion on its own. As a result, the heat generated by the material when it\u2019s exposed to oxygen should be enough to overcome any loss of heat.<\/p>\n\n\n\n<p>Depending upon the geometry, the environment, and the condition of the material or chemical, its ability to sustain a burn will vary. In most cases, flammability refers to the burning in fresh air. However, in an environment with pure oxygen, many chemicals that aren\u2019t generally considered flammable tend to ignite and burn quite easily.<\/p>\n\n\n\n<p>Therefore, gauging the flammability of different materials is critically important for several reasons. To mitigate the risk of a fire outbreak or an explosion, companies conduct flammability testing.<\/p>\n\n\n\n<p>This is done to evaluate some important attributes of the material itself, such as its lower flammability limit, limiting oxygen concentration, upper flammability limit, or the deflagration index. Here\u2019s a brief description of these terms:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Lower flammability limit (LFL):<\/strong> This indicates the lowest concentration at which a flammable gas, solid, or liquid can be considered flammable in open air.<\/li>\n\n\n\n<li><strong>Upper flammability limit (UFL):<\/strong> This indicates the highest concentration at which a flammable gas, solid, or liquid can be considered flammable in open air.<\/li>\n\n\n\n<li><strong>Deflagration Index:<\/strong> This is simply the rate of pressure at which a flammable substance can be allowed to escape without causing an explosion. It\u2019s widely considered as an explosion protection measure.<\/li>\n\n\n\n<li><strong>Limiting Oxygen Concentration (LOC):<\/strong> This determines the minimum amount of oxygen needed for a material to catch on fire.<\/li>\n<\/ul>\n\n\n\n<p>Companies often conduct different types of flammability tests to determine the fire properties of materials. These include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Susceptibility to ignite<\/li>\n\n\n\n<li>Burn rate<\/li>\n\n\n\n<li>Flame spread<\/li>\n\n\n\n<li>\u201cFlash over\u201d point<\/li>\n\n\n\n<li>Combustion capabilities<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.info.ecoonline.com\/cs\/c\/?cta_guid=44d72b50-c3d6-44cf-90b5-2300430f09fb&amp;signature=AHFS_avoAXAP09YqHUpOyRLScG4z579UEg&amp;portal_id=144606870&amp;pageId=112662979809&amp;placement_guid=e77b49dc-3f2e-4fdc-9993-2d38f2e4c28d&amp;click=75baaf76-7493-49d4-aaf8-341a569d0a59&amp;redirect_url=AD7p6W_Ul1Xc0_eU4xHDQTIpI7HBQbo2bc1YIstCWTvlLebzL4FoLAc9vYzJ4fx7dTd7YWm6TlxkvAqExeiq7ookiszhxA5ws_dGKLha2QdAPlXWoMLgFIrxQevLISHRnuixZEVAiux7YcuZuikfiWIfiU5LNHfnTIR7nWjFjMaerRI2FptyX2q2OOsINSAV7DBlijx0RGddvbUnMnI7bJ0Epd0R-plm_d-fwa2-0lvapv2iaWxl0mb58_M0w3RbUChptIXxtw3LdP8XeE2nH6AVjhl729CKgQ&amp;hsutk=c88aeb06e85236c6f2dc792c8f8a10f4&amp;canon=http%3A%2F%2Fwww.ecoonline.com%2Fen-us%2Fglossary%2Fflammability&amp;ts=1737380358606&amp;__hstc=205882892.c88aeb06e85236c6f2dc792c8f8a10f4.1737379089367.1737379089367.1737379089367.1&amp;__hssc=205882892.7.1737379089367&amp;__hsfp=36944505&amp;contentType=standard-page\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"346\" src=\"https:\/\/www.ecoonline.com\/wp-content\/uploads\/2024\/12\/image-29-1024x346.webp\" alt=\"image\" class=\"wp-image-88989\" srcset=\"https:\/\/www.ecoonline.com\/wp-content\/uploads\/2024\/12\/image-29-1024x346.webp 1024w, https:\/\/www.ecoonline.com\/wp-content\/uploads\/2024\/12\/image-29-300x101.webp 300w, https:\/\/www.ecoonline.com\/wp-content\/uploads\/2024\/12\/image-29-768x259.webp 768w, https:\/\/www.ecoonline.com\/wp-content\/uploads\/2024\/12\/image-29-1536x518.webp 1536w, https:\/\/www.ecoonline.com\/wp-content\/uploads\/2024\/12\/image-29-640x216.webp 640w, https:\/\/www.ecoonline.com\/wp-content\/uploads\/2024\/12\/image-29.webp 1600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Vertical and Horizontal Flammability Tests<\/h3>\n\n\n\n<p>Flammability testing is commonly used to determine a substance\u2019s burn rate or how it reacts. In most cases, either vertical or horizontal flammability tests are conducted. The materials are kept on a Bunsen burner, either in a horizontal or vertical formation.<\/p>\n\n\n\n<p>Then, once the material ignites, the source of the ignition is removed, and then experts evaluate factors such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Release of combustive gas<\/li>\n\n\n\n<li>Total loss of mass<\/li>\n\n\n\n<li>Smoke opacity and density<\/li>\n\n\n\n<li>Measuring the heat release<\/li>\n<\/ul>\n\n\n\n<p>These tests are often conducted when a product is passing through its research and development stage. In some cases, flammability testing is also required to ensure that a product meets regulatory, industry, or commercial standards.<\/p>\n\n\n\n<p>Flammability tests also take into account several variables, including:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Temperature<\/li>\n\n\n\n<li>The amount of oxygen in the environment<\/li>\n\n\n\n<li>Ignition energy<\/li>\n\n\n\n<li>Pressure within the vessel<\/li>\n\n\n\n<li>Size and overall dimensions of the vessel<\/li>\n\n\n\n<li>The chemical composition of the gas released<\/li>\n<\/ul>\n\n\n\n<p>In some cases, flammability tests are properly designed, with specific vessels prepared depending upon the type of material to be tested. These can include spherical, large, small, or cylindrical vessels.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Flammability of Gases<\/h2>\n\n\n\n<p>It\u2019s incredibly easy to define gases in terms of how flammable they are. In a mixture of gas and air, there\u2019s always a lower flammability limit, at which the gas doesn\u2019t burn. For instance, when you consider hydrogen, the lower flammability limit is 4% based on volume.<\/p>\n\n\n\n<p>Flammable gases require air to burn, and once the concentration of air reaches a certain threshold, the gas can no longer sustain its burn. In most cases, the presence of other gases can also affect the flammability of a gas.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Flammability of Liquids<\/h2>\n\n\n\n<p>In general, it\u2019s the vapor that burns than the liquid itself. In order for a fire to light up, the concentration of vapor in the air needs to be greater than the lower flammability limit. The temperature of the liquid itself plays an important role here, as do the geometry and the conditions in the environment.<\/p>\n\n\n\n<p>The temperature at which the liquid ignites is referred to as the flash point. And, to sustain the fire once it ignites, it\u2019s important that it generates sufficient vapor. The minimum temperature at which this happens is known as the fire point.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Flammability of Solids<\/h2>\n\n\n\n<p>Solids tend to ignite and burn due to the volatile gases that release from the material of the solid surface. Thus, the ambient conditions play an important role here. In most cases, solids burn well when heat loss is reduced and the amount of surface area to mass is higher.<\/p>\n\n\n\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\">\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-large-font-size\">Reduce The Risk Of Fire In The Workplace<\/h3>\n\n\n\n<p class=\"has-text-align-center\">Learn about minimising the risk of fire hazards in the workplace. Download our FREE&nbsp;<strong>Fire Hazard Awareness in Your Workplace&nbsp;<\/strong>poster.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-a89b3969 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button is-style-large-arrow-fill-jade is-style-large-arrow-fill-jade--2\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/cta-eu1.hubspot.com\/web-interactives\/public\/v1\/track\/click?encryptedPayload=AVxigLLwaeKY9LflMlTe91uVSQNRT0Wjpb8BhDY2v2RXmJxbBBuvg2g1OE2Iz5iT7gjs17ObSdbY4R8xJSoD%2BQu6l8cn828D4RKTUOOuSzfiIx2cmZgpVghJ%2Fu8CBKeAOU1Wfp2jyEnlpurufoq%2F7T15BNvVkafvMKE0%2Ba30%2Fmq0oPLRfUPnOcbyuBo6KdzwgcxCX%2Ba7NmQBPdyn&amp;portalId=144606870&amp;webInteractiveId=164054796509&amp;webInteractiveContentId=118496709353&amp;containerType=EMBEDDED&amp;pageUrl=https%3A%2F%2Fwww.ecoonline.com%2Fen-us%2Fglossary%2Fflammability&amp;pageTitle=Flammability+Meaning+%26+Definition+%7C+EcoOnline+US&amp;referrer=&amp;userAgent=Mozilla%2F5.0+%28X11%3B+Linux+x86_64%29+AppleWebKit%2F537.36+%28KHTML%2C+like+Gecko%29+Chrome%2F132.0.0.0+Safari%2F537.36&amp;hutk=c88aeb06e85236c6f2dc792c8f8a10f4&amp;hssc=205882892.7.1737379089367&amp;hstc=205882892.c88aeb06e85236c6f2dc792c8f8a10f4.1737379089367.1737379089367.1737379089367.1&amp;pageId=112662979809&amp;analyticsPageId=112662979809&amp;hsfp=36944505&amp;canonicalUrl=http%3A%2F%2Fwww.ecoonline.com%2Fen-us%2Fglossary%2Fflammability&amp;contentType=standard-page\">Download Now for a Safer Environment!<\/a><\/div>\n<\/div>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Reduce Fire-Related Incidents in the Workplace with EcoOnline<\/h2>\n\n\n\n<p><a href=\"\/en-us\/software\/health-and-safety-software\">EcoOnline\u2019s Health &amp; Safety Software<\/a> is an excellent cloud-based solution for companies that want to capture, manage, investigate, and reduce fire-related incidents in the workplace. It has several modules available that can be used to report on fire <a href=\"\/en-us\/glossary\/hazard\">hazards<\/a>, and provide observations to those in charge about how to <a href=\"\/en-us\/glossary\/fire-safety-plan\">improve fire safety<\/a> and minimize <a href=\"\/en-us\/glossary\/risk-management\">risk<\/a>.<\/p>\n\n<\/div>\n\t\t\n\t        <\/section>\n","protected":false},"excerpt":{"rendered":"<p>Flammability is a measure of how quickly a specific material is capable of catching fire and burning. Learn more.<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"_acf_changed":false,"content-type":"","_links_to":"","_links_to_target":""},"class_list":["post-84074","glossary-item","type-glossary-item","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Flammability Meaning &amp; Definition | EcoOnline US<\/title>\n<meta name=\"description\" content=\"Flammability is a specific measure of how quickly a certain material is capable of catching fire and burning. 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