{"id":503743,"date":"2021-12-25T14:41:16","date_gmt":"2021-12-25T18:41:16","guid":{"rendered":"https:\/\/firefighternow.com\/?p=503743"},"modified":"2022-08-26T17:10:34","modified_gmt":"2022-08-26T21:10:34","slug":"flammable-vs-combustible-a-firefighter-explains","status":"publish","type":"post","link":"https:\/\/firefighternow.com\/flammable-vs-combustible-a-firefighter-explains\/","title":{"rendered":"Flammable vs. Combustible: A Firefighter Explains"},"content":{"rendered":"\n<p>Using the word flammable in place of combustible and vice-versa may seem like one of those \u201cpo-tay-toe, po-tah-toe\u201d situations, but I\u2019d beg to differ. Applying these terms interchangeably can cause you to treat flammable materials the same way you do combustible ones, and that\u2019d be a big mistake. So what\u2019s the difference?<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignright size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"350\" height=\"250\" src=\"https:\/\/firefighternow.com\/wp-content\/uploads\/2021\/12\/flammable-v.-combustible.jpeg\" alt=\"\" class=\"wp-image-503747\" srcset=\"https:\/\/firefighternow.com\/wp-content\/uploads\/2021\/12\/flammable-v.-combustible.jpeg 350w, https:\/\/firefighternow.com\/wp-content\/uploads\/2021\/12\/flammable-v.-combustible-300x214.jpeg 300w\" sizes=\"(max-width: 350px) 100vw, 350px\" \/><\/figure><\/div>\n\n\n<p><strong>Flammable and combustible materials are separated by their differences in boiling point and flashpoint. The boiling point of a combustible liquid is always over 100 degrees Fahrenheit while a flammable liquid has a boiling point under 100 degrees.&nbsp;<\/strong><\/p>\n\n\n\n<p>If you\u2019re still a little confused, that\u2019s okay. By the time you\u2019re done reading, you\u2019ll be a lot clearer on what both <a href=\"https:\/\/firefighternow.com\/are-farts-actually-flammable\/\" target=\"_blank\" rel=\"noopener\">flammable<\/a> and combustible materials mean directly from a firefighter.&nbsp;<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_63 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6615af6cc914f\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6615af6cc914f\" checked aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/firefighternow.com\/flammable-vs-combustible-a-firefighter-explains\/#Flammable_vs_Combustible_According_to_the_NFPA\" title=\"Flammable vs. Combustible According to the NFPA\">Flammable vs. Combustible According to the NFPA<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/firefighternow.com\/flammable-vs-combustible-a-firefighter-explains\/#Flammable_vs_Combustible_According_to_OSHA\" title=\"Flammable vs. Combustible According to OSHA&nbsp;\">Flammable vs. Combustible According to OSHA&nbsp;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/firefighternow.com\/flammable-vs-combustible-a-firefighter-explains\/#Flammable_Liquid_Examples\" title=\"Flammable Liquid Examples\">Flammable Liquid Examples<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/firefighternow.com\/flammable-vs-combustible-a-firefighter-explains\/#Combustible_Liquid_Examples\" title=\"Combustible Liquid Examples&nbsp;\">Combustible Liquid Examples&nbsp;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/firefighternow.com\/flammable-vs-combustible-a-firefighter-explains\/#Tips_for_Storing_Flammable_andor_Combustible_Liquids\" title=\"Tips for Storing Flammable and\/or Combustible Liquids\">Tips for Storing Flammable and\/or Combustible Liquids<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Flammable_vs_Combustible_According_to_the_NFPA\"><\/span><strong>Flammable vs. Combustible According to the NFPA<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The National Fire Protection Association or NFPA has its own system for categorizing flammable and combustible materials and OSHA has another.&nbsp;<\/p>\n\n\n\n<p>For now, I want to talk about the NFPA\u2019s system, which is known as the <a href=\"https:\/\/www.nfpa.org\/codes-and-standards\/all-codes-and-standards\/list-of-codes-and-standards\/detail?code=30\">NFPA 30<\/a>, the Flammable and Combustible Liquids Code.&nbsp;<\/p>\n\n\n\n<p>According to that code, a liquid can be categorized into one of six classes depending on its boiling point.&nbsp;<\/p>\n\n\n\n<p>Before I get into the organization of NFPA 30 classes, I should talk about what a boiling point means, as it\u2019s going to be discussed in this article a lot.<\/p>\n\n\n\n<p>A liquid\u2019s boiling point refers to the temperature at which the liquid begins to boil. It then becomes a vapor.<\/p>\n\n\n\n<p>Now that I got that out of the way, let\u2019s examine the NPFA 30 code for flammable versus combustible liquids.<\/p>\n\n\n\n<p><strong>Class IA<\/strong><\/p>\n\n\n\n<p>The lowest class of liquids per the NFPA 30 is Class IA. These liquids have a boiling point under 100 degrees, which is approximately 37.8 degrees Celsius. Class IA liquids are considered flammable rather than combustible.&nbsp;<\/p>\n\n\n\n<p><strong>Class IB<\/strong><\/p>\n\n\n\n<p>Above Class IA is Class IB. The boiling point of liquid in this class is just at 100 degrees F or 37.8 degrees C. The boiling point may in some instances rise above that degree threshold, but Class IB liquids would still be considered flammable at that boiling point.&nbsp;<\/p>\n\n\n\n<p><strong>Class IC<\/strong><\/p>\n\n\n\n<p>Class IC liquids are the third and final flammable liquid categorization. Since flammable materials are usually not higher than 100 degrees, the boiling point of a Class IC liquid is 73 degrees F and 22 degrees C.&nbsp;&nbsp;<\/p>\n\n\n\n<p><strong>Class II<\/strong><\/p>\n\n\n\n<p>Moving on to Class II liquids, the boiling point of these liquids is 100 degrees F and 37.8 degrees C. This is the first class of combustible rather than flammable liquids due to the boiling point temperature.&nbsp;<\/p>\n\n\n\n<p><strong>Class III A<\/strong><\/p>\n\n\n\n<p>The second combustible liquids class is Class III A. The boiling point of these liquids far exceeds 100 degrees. The average boiling point of Class III A liquid is 140 degrees F and 60 degrees C. That\u2019s quite hot!&nbsp;<\/p>\n\n\n\n<p><strong>Class III B<\/strong><\/p>\n\n\n\n<p>The most combustible liquids are those in the Class III B categorization. Their boiling point is 100 full degrees over the standard threshold. That\u2019s right, the boiling point of a Class III B liquid is 200 degrees F and 93 degrees C.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Flammable_vs_Combustible_According_to_OSHA\"><\/span><strong>Flammable vs. Combustible According to OSHA<\/strong>&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Okay, now I want to discuss OSHA\u2019s system, as you\u2019ll recall that it differs quite significantly from the NFPA\u2019s categorization of flammable versus combustible liquids. Since 2015, OSHA has followed a Globally Harmonized System or GHS to classify its liquids.<\/p>\n\n\n\n<p>This overwrote the rules featured in OSHA standard 29 CFR 1910.106.&nbsp;<\/p>\n\n\n\n<p>Rather than use six classes as the NFPA does, OSHA divides flammable and combustible liquids into one of four categories.&nbsp;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignright size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"275\" height=\"375\" src=\"https:\/\/firefighternow.com\/wp-content\/uploads\/2021\/12\/flammable-placard.jpeg\" alt=\"\" class=\"wp-image-503748\" srcset=\"https:\/\/firefighternow.com\/wp-content\/uploads\/2021\/12\/flammable-placard.jpeg 275w, https:\/\/firefighternow.com\/wp-content\/uploads\/2021\/12\/flammable-placard-220x300.jpeg 220w\" sizes=\"(max-width: 275px) 100vw, 275px\" \/><\/figure><\/div>\n\n\n<p>The reason for this is that OSHA focuses on both a liquid\u2019s boiling point and its flashpoint. Before I get into the data then, let me explain what a flashpoint is.<\/p>\n\n\n\n<p>All volatile materials have a flashpoint. It refers to the lowest possible temperature that vapor can be exposed to and still ignite. Thus, a flashpoint will be lower than a boiling point.&nbsp;<\/p>\n\n\n\n<p>Keeping that in mind, let\u2019s take a closer look at OSHA\u2019s flammable and combustible liquids categorization.&nbsp;<\/p>\n\n\n\n<p><strong>Category 1<\/strong><\/p>\n\n\n\n<p>All liquids in OSHA\u2019s Category 1 have a boiling point of 95 degrees F and 35 degrees C at the highest. The boiling point can be lower than these temperatures in Category 1 but never higher.&nbsp;<\/p>\n\n\n\n<p><strong>Category 2<\/strong><\/p>\n\n\n\n<p>Once the boiling point of a liquid exceeds 95 degrees F and 35 degrees C, the liquid officially enters Category 2 of OSHA\u2019s classification system.&nbsp;<\/p>\n\n\n\n<p><strong>Category 3<\/strong><\/p>\n\n\n\n<p>A Category 3 liquid is one with a higher boiling point range. On the lower end, the boiling point may be 73 degrees F and 23 degrees C. At its highest, the boiling point is 100 degrees F and 37.8 degrees C. This is sort of like how in the NFPA\u2019s flammable and combustible liquids categorization system, Class IC boiling point temps were lower than Class IB.&nbsp;<\/p>\n\n\n\n<p><strong>Category 4<\/strong><\/p>\n\n\n\n<p>The fourth and final category in OSHA\u2019s system is Category 4. This is where liquids are classed when the boiling point clearly exceeds 100 degrees. Like Category 3, the Category 4 boiling points are presented as a temperature range.<\/p>\n\n\n\n<p>On the lower end of that range is a boiling point of 140 degrees F and 60 degrees C. On the higher end are temperatures of 199.4 degrees F and 93 degrees C.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Flammable_Liquid_Examples\"><\/span><strong>Flammable Liquid Examples<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Between those two charts, you should have a clearer understanding of flammable versus combustible liquids. If you\u2019re still feeling a little fuzzy though, this section and the next will be full of examples so you can clearly differentiate one type of liquid from the other.&nbsp;<\/p>\n\n\n\n<p>Let\u2019s start with examples of flammable liquids.&nbsp;<\/p>\n\n\n\n<p><strong>Mineral Spirits<\/strong><\/p>\n\n\n\n<p>You might have a canister of mineral spirits in your garage right now, especially if you\u2019re thinning paint to repaint a room in your home. As a type of solvent, mineral spirits are categorized as flammable.&nbsp;<\/p>\n\n\n\n<p><strong>Hydrazine<\/strong><\/p>\n\n\n\n<p>Hydrazine is admittedly not one of those things the average person comes across all that often. A toxic organic compound, hydrazine is used in rocket fuel to burn when combined with oxygen.&nbsp;<\/p>\n\n\n\n<p><strong>Turpentine<\/strong><\/p>\n\n\n\n<p>Now here\u2019s a more common product, turpentine. Produced from the extract of coniferous trees, turpentine is an oil that often goes into cosmetics, soap, cleaning agents, perfumes, and paint solvent.&nbsp;<\/p>\n\n\n\n<p><strong>Hexane<\/strong><\/p>\n\n\n\n<p>Speaking of cleaning agents, hexane is a primary ingredient used to make them. The oils extracted from vegetables and seeds go into the production of hexane, which is also a solvent. People aren\u2019t supposed to breathe it in, as, in large quantities, it can affect your central nervous system.&nbsp;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignright size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"250\" height=\"350\" src=\"https:\/\/firefighternow.com\/wp-content\/uploads\/2021\/12\/gasoline.jpeg\" alt=\"\" class=\"wp-image-503749\" srcset=\"https:\/\/firefighternow.com\/wp-content\/uploads\/2021\/12\/gasoline.jpeg 250w, https:\/\/firefighternow.com\/wp-content\/uploads\/2021\/12\/gasoline-214x300.jpeg 214w\" sizes=\"(max-width: 250px) 100vw, 250px\" \/><\/figure><\/div>\n\n\n<p><strong>Gasoline<\/strong><\/p>\n\n\n\n<p>That\u2019s right, the gasoline your car might have in its tank right now is classified as a flammable material.&nbsp;<\/p>\n\n\n\n<p><strong>Ethyl Acetate<\/strong><\/p>\n\n\n\n<p>Like hexane, ethyl acetate is a popular ingredient in cleaning products and mixtures. You\u2019ll also find it in perfume, lacquer, varnish, and some paints. You might want to rethink where you store products containing ethyl acetate given that it\u2019s flammable.&nbsp;<\/p>\n\n\n\n<p><strong>Acetone<\/strong><\/p>\n\n\n\n<p>To remove varnish, paint, and even <a href=\"https:\/\/firefighternow.com\/is-nail-polish-flammable\/\" target=\"_blank\" rel=\"noopener\">nail polish<\/a>, you use acetone. Commonly found in medicine cabinets and garage cabinets alike, acetone seems like a perfectly innocent ingredient, but it too could start a fire.&nbsp;<\/p>\n\n\n\n<p><strong>Pentane<\/strong><\/p>\n\n\n\n<p>Behind the walls of your home is insulation. If the insulation uses polystyrene foam, such as around heating pipes and in your fridge, then pentane went into its production. That\u2019s not good considering that pentane is flammable.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Combustible_Liquid_Examples\"><\/span><strong>Combustible Liquid Examples&nbsp;<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Combustible liquids are fewer and further between than flammable liquids, but there are still plenty out there. Allow me to tell you which they are.&nbsp;<\/p>\n\n\n\n<p><strong>Linseed Oil<\/strong><\/p>\n\n\n\n<p>Flax oil or linseed oil is a yellow-colored edible oil sourced from flax plants. The oil, despite its edibility, goes into applications such as stains, varnishes, and paints as well as concrete and wood preservative.&nbsp;<\/p>\n\n\n\n<p><strong>Kerosene<\/strong><\/p>\n\n\n\n<p>Gas is flammable and kerosene is combustible. That\u2019s a good distinction to keep in mind if you have a generator or a heater that runs on kerosene.&nbsp;<\/p>\n\n\n\n<p><strong>Diesel<\/strong><\/p>\n\n\n\n<p><a href=\"https:\/\/firefighternow.com\/is-diesel-flammable-solved\/\" target=\"_blank\" rel=\"noopener\">Diesel is not only flammable but combustible as well<\/a>. That makes it doubly troublesome to have a diesel vehicle around a source of fire. The vehicle will surely go up in flames sooner than later!&nbsp;<\/p>\n\n\n\n<p><strong>Dichlorobenzene<\/strong><\/p>\n\n\n\n<p>Everyone hates pests around the house, but beware. The products you use to repel insects, bats, squirrels, mice, rats, and snakes could contain dichlorobenzene. This volatile organic compound is also combustible.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Tips_for_Storing_Flammable_andor_Combustible_Liquids\"><\/span><strong>Tips for Storing Flammable and\/or Combustible Liquids<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>If you have one or more of the above flammable and\/or combustible materials in your home or on your property, I recommend following these storage tips.<\/p>\n\n\n\n<p><strong>Keep the Containers Closed Until Needed<\/strong><\/p>\n\n\n\n<p>Until you\u2019re ready to open the canister of gas or turpentine and use the flammable or combustible liquid you purchased, keep the canister closed. When you use the liquid, be sure to secure the lid of the canister tightly every time.&nbsp;<\/p>\n\n\n\n<p><strong>Maintain a Dry, Cool Storage Area<\/strong><\/p>\n\n\n\n<p>Where you store flammable and combustible liquids matters a lot if you want to avoid <a href=\"https:\/\/firefighternow.com\/what-is-a-bleve-explained\/\" target=\"_blank\" rel=\"noopener\">explosion or fire<\/a>. The canisters should always be stored in a dry, cool area. A cabinet, even a medicine cabinet, suffices, but a shed isn\u2019t the best spot.<\/p>\n\n\n\n<p><strong>Avoid Ignition Sources<\/strong><\/p>\n\n\n\n<p>Any potential sources of ignition in the room around the flammable or combustible materials must be removed. That includes machinery, furnaces, fireboxes, boilers, electric lamps, hot plates, torches, ovens, and driers. Do not smoke cigarettes in a room holding combustible and\/or flammable materials.&nbsp;&nbsp;<\/p>\n\n\n\n<p>Flammable and combustible materials are not the same. Differences in boiling point and flashpoint separate liquids that are deemed more flammable than combustible or vice-versa. In some instances, a liquid can be both flammable and combustible.<\/p>\n\n\n\n<p>That doesn\u2019t mean you cannot keep flammable and\/or combustible materials in your home or on your property, as you can. You just need to follow basic safety <a href=\"https:\/\/firefighternow.com\/top-9-causes-of-house-fires-and-tips-to-prevent-them\/\" target=\"_blank\" rel=\"noopener\">tips to prevent a fire<\/a>. Be safe out there!&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Using the word flammable in place of combustible and vice-versa may seem like one of those \u201cpo-tay-toe, &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Flammable vs. Combustible: A Firefighter Explains\" class=\"read-more button\" href=\"https:\/\/firefighternow.com\/flammable-vs-combustible-a-firefighter-explains\/#more-503743\" aria-label=\"Read more about Flammable vs. Combustible: A Firefighter Explains\">Read More<\/a><\/p>\n","protected":false},"author":2,"featured_media":503747,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Flammable vs. Combustible: A Firefighter Explains | FireFighterNow<\/title>\n<meta name=\"description\" content=\"Using the word 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