chloe. yarn. May 27th , 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.
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.
There are several thicknesses of craft yarn also referred to as weight. This is not to be confused with the measurement and/or weight listed above. The Craft Yarn Council of America is making an effort to promote a standardized industry system for measuring this numbering the weights from (finest) to 6 (heaviest). Some of the names for the various weights of yarn from finest to thickest are called lace fingering sport double-knit (or DK) worsted aran (or heavy worsted) bulky and super-bulky. This naming convention is more descriptive than precise; fibre artists disagree about where on the continuum each lies and the precise relationships between the sizes.
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