Hey there, fellow cashmere lovers and maybe even the folks in the market for a new coat! I’m [Cashmere Coat Supplier Name Removed], and let’s cut to the chase—if you’ve ever dropped a few hundred (or thousand) dollars on a cashmere coat, you know it’s not just about how soft it feels on your arm. It’s about that coat being around for years, right? No one wants to pull on their favorite piece and have a little snag turn into a gaping hole by the end of the season. That’s why testing cashmere fiber strength is basically my job every single day as a supplier, and today I’m spilling the not-too-fancy, real-deal way we do it (spoiler: it’s not just pinching and calling it good, though that’s a quick check). Cashmere Coat
Let’s start with the basics, because I get it—most people don’t know what makes cashmere different from, say, that cheap acrylic stuff from fast fashion. Cashmere comes from the undercoat of goats (yes, the fluffy ones from places like Mongolia and Inner Mongolia), and each fiber is super fine—usually between 14 and 19 microns thick. The strength of those individual fibers? That’s what holds the whole coat together, along with how they’re spun into yarn and woven into fabric. If the fibers are weak, even the most expensive cashmere coat will fall apart after a few wears, especially if you’re tossing it over a backpack or brushing it against zippers all winter.
First off, let’s do the quick, at-home check you can pull right now—no fancy lab gear needed, because sometimes you just need to rule out garbage fast. I call this the “Pinch & Pull Test” (creative, I know). Grab a small, hidden spot on the coat—like the inside of the hem or the back under the collar, where no one will notice—and pinch between your thumb and forefinger. Squeeze pretty tight, like you’re trying to wring out a wet rag, then gently pull the fibers apart. Wait a second—if those fibers snap super easily, or if there’s a lot of fuzz coming off, that’s a red flag. Real, good cashmere fibers should give a little, but they shouldn’t break immediately. If you do this and it feels like pulling apart cotton candy that’s been sitting out all day, that’s not the stuff you want. But here’s the thing—this is just a surface check. The real tests are what we do in our back office (yes, we have a tiny lab corner—no, it’s not as fancy as the ones in big brands, but it works) because the pinch test only tells you so much.
Now, let’s get into the actual fiber testing we do for every batch before it even becomes a coat. First, we start with the fiber itself, because a coat is only as strong as its weakest fiber. The go-to method here is something called the single fiber tensile test. Don’t panic—I’m not going to hit you with a bunch of jargon, but let’s break it down. We take individual cashmere fibers (we pluck a few from each bale, never more than 10 at a time so we don’t ruin the whole lot) and clamp each one into a tiny machine that pulls it apart, measuring exactly how much force it takes to snap it. The numbers here matter a lot. For premium cashmere, that force should be around 2 to 3 centinewtons per micron—wait, let me translate that: basically, if a fiber is 15 microns thick (that’s super fine, the good stuff), it should take about 30 to 45 centinewtons to break. If it’s weaker than that, it’s probably been processed too much—like, over-washed or heated too hot, which fries the fibers and makes them brittle. We’ve had batches come in where this test fails, and you bet we send those right back. No exceptions—our customers (you know who you are) don’t want coats that fall apart after a year, and we don’t want to be the supplier that sells them.
Next up, after we know the individual fibers are strong, we test the yarn, because spinning weak fibers into a tight yarn is what makes the fabric hold together. The yarn tensile test is pretty straightforward too. We wind a long strand of the cashmere yarn (about 50 centimeters, not too short) around two small hooks on that same pull machine, and we pull it until it breaks. The key here is the “twist” of the yarn—cashmere yarn with the right amount of twist is stronger than yarn that’s too loose (easy to snags) or too tight (prone to snapping). For our yarns, we aim for a strength of at least 15 to 20 cN per tex—tex is just a measurement of yarn weight, so don’t overthink it. If the yarn breaks at a lower number, that means the fibers aren’t held together tight enough, so every little pull on the coat will weaken it more over time. We once had a yarn supplier try to cut costs by using less twist, and this test caught it—their yarn broke at 12 cN/tex, which was way below our minimum. We dumped them, even though they offered us a 10% discount. Short-term savings aren’t worth long-term headaches for anyone.
Now, the fabric itself is what ends up as the coat, so we test that too. The tear strength test is the big one here, because even if the fibers and yarn are strong, the fabric can still be weak if it’s woven too loosely. We take a small fabric swatch (again, hidden spots are fine—we use leftover fabric from the same batch that’s not going to be in a coat) and cut a small slit in the middle. Then we pull the two sides of the slit apart with a machine, measuring how much force it takes to make the tear get longer. For cashmere coats, we need that tear strength to be at least 5 Newtons—wait, no, not the fancy physics newton, just the regular strength unit. If it’s lower than that, the fabric is going to snag really easily, and once that snag happens, it’ll tear right across the chest or the sleeve. We had a customer once bring back a coat that they snagged on a door handle, and the tear was almost a foot long. Turns out, the fabric’s tear strength was only 3 Newtons—way too weak. We fixed it for free, and since then, we’ve upped our fabric testing to make sure that never happens to another customer.
Wait, but what about the real-world stuff? Like, a coat isn’t just sitting in a lab—it’s being worn, washed, maybe even crumpled in a suitcase. So we do a little “wear and tear” test that’s basically us simulating how the coat will hold up over months of use. We take a fabric swatch and rub it back and forth against a rough surface (like a denim jacket, since that’s what most people wear their coats over) for 100 times, then we check for pilling and fiber loss. Pilling is that little fuzz ball stuff that gets on cashmere, right? A little pilling is normal, but if we see big pills or a lot of fuzz coming off, that means the fibers are slipping out of the fabric, which makes the whole thing weaker. We also do a wash test—we wash a small swatch in cold water, no detergent that’s too harsh, then hang it to dry. Then we test its strength again. Cashmere should hold up pretty well to a gentle wash, but if the strength drops more than 10% after washing, that means the processing was bad. We once had a batch where the strength dropped 20% after washing, so we knew those fibers had been treated with chemicals that made them weak when wet. We tossed the whole batch—no way we’d let that leave our warehouse.
Now, let’s get back to that quick at-home test, because not everyone can send their coat to a lab (though if you need that, we can point you to places—just sayin’). The pinch and pull is good, but another quick one is the “Snag Test.” Take a small safety pin (not sharp, please—be nice to your coat) and gently poke it through the fabric, then pull it out. If the fabric snagged or a fiber came loose, that’s a problem. Good cashmere should just move with the pin, not pull apart. Also, check the weight—quality cashmere coats aren’t feather-light. If your coat feels like a piece of tissue paper, that’s not right. Our coats are usually between 800 and 1200 grams, depending on the style, and that weight is a sign that we used enough strong fibers to make it durable, not just soft.
I know what you’re thinking—this sounds like a lot of work, and it is. But that’s what being a good supplier is about. I don’t want to sell you a coat that you’ll have to replace next year. I want you to wear our cashmere coat for 5, 10, even 15 years. My grandma used to say, “You get what you pay for,” and that’s never been more true than with cashmere. The cheap stuff that feels soft in the store? It’s probably been processed with chemicals to make it feel that way, and the fibers are weak, so it’ll fall apart fast. The stuff we sell? We test every single batch, from fiber to fabric to finished coat, to make sure it can handle whatever life throws at it—brushing against zippers, being tossed over a chair, even a gentle wash at home.
Wait, let’s be real—no coat is indestructible. Even the best cashmere coat will snag if you catch it on a metal fence, right? But the difference is, a strong cashmere coat won’t tear all the way. It’ll just have a small snag that you can fix with a little scissors and patience, not a gaping hole that has to be mended by a professional (which costs almost as much as the coat itself). That’s the whole point of testing fiber strength—so you can enjoy your coat without worrying about it falling apart the second you take it out of the closet.
If you’re in the market for a cashmere coat, whether for personal use or to restock your boutique, hit me up. We don’t do the flashy, overpriced stuff—we do solid, tested cashmere coats that last. We can walk you through the testing process more, send you samples, whatever you need. No pressure, just real talk about quality.
Oh, and one last tip—if you already have a cashmere coat at home, and you want to test its strength, don’t do the pinch and pull on the sleeves or front. Those are the parts people see, and it’ll leave a mark. Stick to the hidden spots, like the inside of the sleeve under the arm or the hem that’s tucked in when you wear it. Be kind to your coat, and it’ll be kind to you for years.
Down Jacket References
ASTM D3822/D3822M, Standard Test Method for Tensile Properties of Single Textile Fibers
ASTM D2256/D2256M, Standard Test Method for Tensile Properties of Yarns by the Single-Strand Method
ASTM D4964/D4964M, Standard Test Method for Tear Strength of Fabrics (Gurley Method)
Cashmere Fiber Quality Specifications, International Wool Textile Organization (IWTO)
Haiyan Zhongyang Clothing Co., Ltd.
As one of the most professional cashmere coat manufacturers in China, we also support customized service. We warmly welcome you to wholesale bulk high quality cashmere coat in stock here from our factory. If you have any enquiry about free sample, please feel free to email us.
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