{"id":632,"date":"2026-10-23T12:12:26","date_gmt":"2026-10-23T04:12:26","guid":{"rendered":"http:\/\/www.beautystshop.com\/blog\/?p=632"},"modified":"2026-10-23T12:12:26","modified_gmt":"2026-10-23T04:12:26","slug":"how-to-evaluate-the-thermal-stability-of-materials-using-thermal-analysis-instruments-4d8c-a45dbc","status":"publish","type":"post","link":"http:\/\/www.beautystshop.com\/blog\/2026\/10\/23\/how-to-evaluate-the-thermal-stability-of-materials-using-thermal-analysis-instruments-4d8c-a45dbc\/","title":{"rendered":"How to evaluate the thermal stability of materials using thermal analysis instruments?"},"content":{"rendered":"

If you\u2019ve ever worked with materials that fall apart, warp, or give off weird fumes when heated, you know thermal stability isn\u2019t just a science buzzword\u2014it\u2019s the difference between a plastic component that lasts 5 years in a car engine and one that cracks after 6 months, or a battery electrode that works safely vs. one that risks overheating. As a thermal analysis instruments supplier who\u2019s talked to thousands of engineers, lab techs, and product managers over the years, I can tell you this: evaluating thermal stability doesn\u2019t have to mean guessing or waiting for a material to fail in the field. The right tools turn that messy, expensive guesswork into clear, actionable data. Let\u2019s break down how it actually works, no jargon overload, just what you need to know to get reliable results. Thermal Analysis Instruments<\/a><\/p>\n

<\/p>\n

First, let\u2019s get one thing straight: \u201cthermal stability\u201d isn\u2019t a single number. It\u2019s a set of behaviors. A polymer might be great at resisting heat until 250\u00b0C, but if it starts releasing volatile compounds at 210\u00b0C, that\u2019s a problem for medical devices where outgassing can contaminate surfaces. A ceramic might not melt until 1,700\u00b0C, but if it loses 10% of its mass at 800\u00b0C in air, that means it\u2019s corroding fast in high-heat industrial furnaces. So you can\u2019t measure it with one test\u2014you need the right combination of tools, each designed to pick up a different piece of the puzzle.<\/p>\n

Let\u2019s start with the workhorse of thermal analysis: thermogravimetric analysis, or TGA for short. This is the tool we\u2019re most asked about, and for good reason. A TGA does one simple, super useful thing: it heats your sample at a controlled rate (say 10\u00b0C per minute, up to 1,000\u00b0C) while constantly weighing it. That means you can literally see when a material starts breaking down. For example, if you test a nylon 6,6 sample, the TGA will show a flat line of weight until around 400\u00b0C, then it\u2019ll drop steadily as the nylon decomposes into small gas molecules. That 400\u00b0C mark is your onset temperature for thermal decomposition, a key number for anyone using nylon in high-temperature parts. But TGA does more than just pick when things decompose. Run it in different atmospheres\u2014nitrogen for inert conditions (like what a plastic would see inside a car\u2019s interior) or air for oxidative conditions (for something used in open air)\u2014and you can see how stability changes based on environment. I once worked with a aerospace engineer who tested a new heat-resistant polymer for turbine components; running the TGA in air showed it decomposed 50\u00b0C earlier than in nitrogen, which told him he needed a small additive to prevent oxidation, a fix he never would\u2019ve caught without that test. The biggest tip here: don\u2019t just look at the final mass loss. Those little \u201csteps\u201d in the TGA curve? Each one is a different decomposition event. If your material has 2% mass loss at 150\u00b0C, that\u2019s probably moisture or residual solvent, not the polymer itself. Ignore that at your peril\u2014if you skip drying a sample before testing, you\u2019ll get a false low onset temperature and design a part that fails early.<\/p>\n

Next up: differential scanning calorimetry, or DSC, another core tool. Whereas TGA tracks mass, DSC tracks heat flow. It measures how much heat you need to add (or take away) to keep your sample at the same temperature as a reference material that doesn\u2019t change when heated. That lets you spot things like melting, glass transition, and curing reactions\u2014all critical for thermal stability. Let\u2019s use the same nylon example: TGA tells you when it decomposes, but DSC tells you when it softens to the point it can\u2019t hold shape. The glass transition temperature (Tg) of nylon 6,6 is around 50\u00b0C. That means below 50\u00b0C it\u2019s rigid, above that it starts to soften, even before it melts at ~260\u00b0C. If you\u2019re using that nylon to make a phone case that gets hot in a car, knowing the Tg is 50\u00b0C tells you it\u2019ll start to feel bendy on a 60\u00b0C summer day\u2014way before you see decomposition from TGA. DSC also tests oxidative stability, which is huge for things like rubber, plastic packaging, and engine parts. The oxidative induction time (OIT) test, which uses DSC, measures how long a material can resist oxidation at a set temperature. For example, a rubber seal might have an OIT of 20 minutes at 150\u00b0C, meaning it\u2019ll take 20 minutes before oxidation starts breaking it down. If you\u2019re designing a seal that has to last 10 years in a 120\u00b0C engine, you can extrapolate from that OIT number to see if the material is stable enough\u2014no need to wait a decade to test. One mistake people make with DSC: not using the right reference. If your reference sample is even slightly different, or you skip calibrating the temperature with a standard (like indium, which melts at a known 156.6\u00b0C), your Tg or melting point numbers will be off by 10 or 20\u00b0C. That might not sound like much, but for materials where every degree counts, it\u2019s the difference between a safe part and a failure.<\/p>\n

Now, what if you need to look at how a material changes shape when heated, not just mass or heat? That\u2019s where thermomechanical analysis (TMA) comes in. TMA applies a small force to a sample while heating it, and measures how much it stretches, shrinks, or deforms. Let\u2019s take a composite material for wind turbine blades: you need it to stay rigid at 80\u00b0C, where the blade gets hot in the sun, but not so brittle that it cracks in cold weather. TMA can tell you the coefficient of thermal expansion (CTE)\u2014how much it expands when heated\u2014so you can match it to other materials in the blade to prevent warping or delamination. It can also show when a material starts to soften: if your TMA sample is a thin film of polyimide, you\u2019ll see it hold its shape until 300\u00b0C, then start to stretch as it gets soft, which is way more useful for coating applications than TGA or DSC, which don\u2019t track physical shape change. We worked with a medical device manufacturer last year that used TMA to test a polymer catheter material; they found the catheter would start to bend at body temperature (37\u00b0C), which is exactly where it needs to stay rigid to insert, but flexible once inside. That was a tiny but critical detail they missed until they ran TMA.<\/p>\n

Wait, but what about when you need to see what gases are being released when a material breaks down? TGA, DSC, TMA all tell you what\u2019s happening to the material itself, but not the byproducts. That\u2019s where coupled techniques come in\u2014mass spectrometry (MS) or Fourier-transform infrared spectroscopy (FTIR) paired with TGA, called TG-MS or TG-FTIR. If you\u2019re testing a material for aerospace use, you need to know it won\u2019t release toxic or flammable gases in a fire. TG-FTIR can take every gas that comes off during TGA and identify what it is\u2014carbon monoxide, hydrogen cyanide, water, whatever. I once had a customer who tested a new flame-retardant plastic for train interiors; TG-FTIR showed it released high levels of formaldehyde when burned, which was a dealbreaker for EU safety regulations. Without that coupled technique, they would\u2019ve approved the material and faced a huge recall. These tools aren\u2019t just for big companies, either; we have compact TG-FTIR systems that fit on a lab bench for small manufacturers who don\u2019t need a huge, high-cost instrument.<\/p>\n

But here\u2019s the thing: buying a thermal analysis instrument is only half the battle. Even the best TGA or DSC is useless if you don\u2019t run the test right, or you misinterpret the data. Let me share a few common mistakes I see all the time. First, sample size. If you run a 1 mg sample instead of a 10 mg sample, your decomposition curve will be noisier, and you might miss small mass loss events that matter. A too-big sample? It might not heat evenly, leading to a false onset temperature. Second, heating rate. Fast heating rates (20\u00b0C per minute) give you quick results, but they can make decomposition happen at a higher temperature than it would in real life. For testing a material that will heat up slowly in a product (like a plastic bag in the sun), use a slow heating rate (5\u00b0C per minute) to get accurate, relevant data. Third, atmosphere. Testing a plastic in nitrogen is great for long-term stability, but if you\u2019re testing it for use in a warehouse, it\u2019s going to be exposed to oxygen, so you need to run it in air for a realistic result.<\/p>\n

Another big one: aging your sample first. If you test a brand-new plastic that was just molded, you might get a different thermal stability result than if you test a sample that\u2019s been sitting on a shelf for a year absorbing moisture. Most materials undergo \u201cpre-aging\u201d in real use, so mimicking that in the lab\u2014like putting a sample in a humidity chamber for a week before testing\u2014will give you data that actually matches how the material will perform in the field.<\/p>\n

Now, who is this all for? Let\u2019s be clear: thermal stability testing isn\u2019t just for PhDs in materials science. We work with everyone from small injection molding shops testing a new batch of PLA for 3D printing to big aerospace companies testing next-generation ceramics. If you\u2019re making a product that will be exposed to heat\u2014car parts, electronics, medical devices, packaging, energy storage\u2014you need to know how your material behaves when heated, not just what it\u2019s made of. For example, 3D printing engineers: a lot of PLA is advertised as \u201cheat-resistant up to 60\u00b0C,\u201d but running a quick TGA and DSC test will tell you exactly when it softens or decomposes, so you don\u2019t waste time printing a bracket that melts on a hot day. For battery makers, thermal stability is non-negotiable; a battery electrode that decomposes at 150\u00b0C is a fire hazard, so TG-MS can identify the gases released during thermal runaway, letting you design safer cells.<\/p>\n

Here\u2019s the thing about thermal analysis: it\u2019s not a black box. The instruments we build let you get data without needing a PhD to operate them, with easy-to-use software that walks you through test setups, calibrations, and analysis. But if you\u2019re new to this, you don\u2019t have to figure it out alone. We work with labs to help them design tests for their specific materials, whether they\u2019re testing food packaging for outgassing or industrial hoses for oxidation stability. We also offer training, support, and even custom test methods for materials that don\u2019t fit standard protocols.<\/p>\n

<\/p>\n

Let me wrap this up: evaluating material thermal stability is about combining the right tools for your use case, running tests correctly, and interpreting the data to fit your real-world needs. TGA for mass change, DSC for heat flow, TMA for physical shape, and coupled techniques for byproduct identification\u2014each one fills a gap. No single test gives the full picture, but together, they eliminate the guesswork that leads to failed products, wasted materials, and even safety risks. If you\u2019re tired of guessing how your material will hold up in heat, or you need to validate that a new material meets your stability requirements, let\u2019s talk. We can help you pick the right instruments, design the right tests, and make sure you get reliable data that drives your product forward.<\/p>\n

Thermal Analysis Instruments<\/a> Reference:<\/p>\n

    \n
  1. ASTM E1131, Standard Test Method for Compositional Analysis by Thermogravimetry<\/li>\n
  2. S. Zhong, "Thermal Analysis of Polymers: Principles and Applications," Journal of Applied Polymer Science, 2018<\/li>\n
  3. W.W. Wendlandt, "Thermal Methods of Analysis," 3rd Edition, John Wiley & Sons, 1986<\/li>\n
  4. ASTM D3895, Standard Test Method for Oxidative Induction Time of Polyolefins by Differential Scanning Calorimetry<\/li>\n<\/ol>\n
    \n

    Nanjing Longbow Scientific&Educational Instrument Co., Ltd.<\/a>
    As one of the most professional thermal analysis instruments manufacturers and suppliers in China, we’re featured by quality products and good service. Please rest assured to buy customized thermal analysis instruments from our factory. If you have any enquiry about pricelist, please feel free to email us.
    Address: Room D, 22th floor, No.305, North Jiangdong Road, Nanjing,Jiangsu Province, China
    E-mail: 79425380@qq.com
    WebSite:     https:\/\/www.lb-physics.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    If you\u2019ve ever worked with materials that fall apart, warp, or give off weird fumes when … How to evaluate the thermal stability of materials using thermal analysis instruments?<\/span>Read more<\/a><\/p>\n","protected":false},"author":174,"featured_media":632,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[595],"class_list":["post-632","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-thermal-analysis-instruments-42b1-a49409"],"_links":{"self":[{"href":"http:\/\/www.beautystshop.com\/blog\/wp-json\/wp\/v2\/posts\/632","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.beautystshop.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.beautystshop.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.beautystshop.com\/blog\/wp-json\/wp\/v2\/users\/174"}],"replies":[{"embeddable":true,"href":"http:\/\/www.beautystshop.com\/blog\/wp-json\/wp\/v2\/comments?post=632"}],"version-history":[{"count":0,"href":"http:\/\/www.beautystshop.com\/blog\/wp-json\/wp\/v2\/posts\/632\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.beautystshop.com\/blog\/wp-json\/wp\/v2\/posts\/632"}],"wp:attachment":[{"href":"http:\/\/www.beautystshop.com\/blog\/wp-json\/wp\/v2\/media?parent=632"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.beautystshop.com\/blog\/wp-json\/wp\/v2\/categories?post=632"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.beautystshop.com\/blog\/wp-json\/wp\/v2\/tags?post=632"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}