This standard gives the principles and recommended units of the Tex System for the expression of linear density and includes in Appendix A conversion tables for calculating the tex values of numbers or counts in other systems together with in Appendix B a statement of the procedure for the implementation of the Tex System in trade and industry.

The Tex System is applicable to all kinds of textile fibers, intermediate products (for example tops, slivers and rovings), yarns and similar structures.