chloe. yarn. June 03rd , 2018.
When natural hair-type fibers are burned they tend to singe and have a smell of burnt hair; this is because many as human hair are protein-derived. Cotton and viscose (rayon) yarns burn as a wick. Synthetic yarns generally tend to melt though some synthetics are inherently flame-retardant. Noting how an unidentified fiber strand burns and smells can assist in determining if it is natural or synthetic and what the fiber content is.
Other natural fibers that can be used for yarn include linen and cotton. These tend to be much less elastic and retain less warmth than the animal-hair yarns though they can be stronger in some cases. The finished product will also look rather different from the woollen yarns. Other plant fibers which can be spun include bamboo hemp corn nettle and soy fiber.
In Europe textile engineers often use the unit tex which is the weight in grams of a kilometre of yarn or decitex which is a finer measurement corresponding to the weight in grams of 0 km of yarn. Many other units have been used over time by different industries.
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