This specification covers one type of organic fiber in the form of yarn. The product shall be formed as a multiplicity of filaments drawn together and gathered into an approximately parallel arrangement.
SAE AMS3901/12B-1998 history
1998SAE AMS3901/12B-1998 Yarn, Organic Fiber (Para-Aramid), High Modulus OY 390 (2689)/21.1 Tensile Strength, 16.5 (114)/900 Tensile Modulus 2160 (2400 d tex) Denier, 1.2% Finish