The raw material is rabbit hair, and yarn count refers to the fineness of the yarn.
Its designation includes S, D, N, Tex, Dtex, etc. Specific fabrics use specific specifications, with S and D being the most commonly used. Scientific literature generally uses tex.
S is the English yarn count, which refers to the number of 840-yard lengths of yarn weighing one pound at standard moisture regain. Generally, short-staple fiber yarn count is expressed as S, and short-staple fiber is abbreviated as Spun. The coarser the yarn, the smaller the S value; the finer the yarn, the larger the S value. For example, 40S yarn is finer than 20S yarn.
D is an abbreviation for Denier, a method of expressing the fineness of chemical fibers. It refers to the weight in grams of 9000 meters of filament at standard moisture regain. Generally, filament count is expressed as D, and filament is abbreviated as Filament. A higher D value indicates a thicker yarn; for example, 75D is thicker than 50D.
Tex, also known as "count," or simply tex, formerly called metric count, refers to the weight in grams of 1000 meters of yarn at standard moisture regain.
Nm, the metric count, refers to the multiple of the length in meters of 1 gram of yarn at standard moisture regain. That is, 1 gram of yarn exactly one meter long is 1 (metric) count yarn; 1 gram of yarn 200 meters long has a yarn fineness of 200 count. Metric count is also a fixed-weight system, therefore, the higher the count, the finer the yarn.
dtex, or simply dtex, refers to the weight in grams of a 10,000-meter fiber bundle.
The following are conversion formulas between several units: D=5315/S, D=9000/N, TeX=D/9, 1 TeX=10 Dtex, TeX=1000/N, Dtex=10D/9, Dtex=1000/N
