Titer Tex and Denier

It is fairly difficult and inaccurate to measure the diameter of fibers or filaments. It is much easier to weigh a certain length of filament or yam. We thus determine a linear density, or titer. The tex unit is officially included in the SI system, and has become the standard in Europe. The older unit denier stems from ffie silk industry and is still common in the USA and in many Asian countries. The definitions are  

It is fairly common practice to use dedtex (dtex) instead of tex (dtex = grams per 10,000 meter). Numbers in dtex and denier differ by about 10% for accurate relationships, see Table 17.1. 

The diameter of a filament can be calculated from the filament titer if the density 

For yam titers it is usefiil to specify the number of filaments. For example, an aramid yam type could be indicated as 1500 denier f 1000, which means that the yam contains 1000 filaments, each of 1.5 denier. In dtex, this yarn type would be 1670 dtex f 1000, a filament titer of 1.67 dtex. 

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