This standard specifies the requirements, sampling, test methods, inspection rules, signs, labels, packaging, transportation and storage of acid yellow P-4RL 200% (CI acid yellow 199) products. This standard applies to the quality inspection of acid yellow P-4RL 200%. This product is mainly used for dyeing nylon fiber. Structural formula: CHNOSNa Relative molecular mass: 450.40 (according to the 2001 international relative atomic mass)