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Tex is a unit of measure for the linear mass density of fibers, the unit code is "tex". Tex is defined as the mass in grams per 1000 meters. Most commonly used is the decitex, abbreviated dtex, which is the mass in grams per 10,000 meters.

Fiber can be used in many products, including cigarette filters, optical cable, yarn, and fabric. This definition can apply to fibers in two ways. Filament dtex is defined as the mass in grams per 10,000 meters of a single filament of fiber. Yarn is an example of an agglomeration of fibers. One can calculate the cross area of a single filament easily using:

<math>\varnothing= \sqrt{\frac{4\times 10^{-7}\cdot \mathrm{dtex}}{\pi\rho}}</math>

In which <math>\rho</math> represents the material's density.

Another unit of measure for the linear mass density of fibers is the denier, which is the mass in grams per 9,000 meters.

it:Tex (unità di misura)