HG/T 4729-2014 "Spinning & weaving dyeing and finishing aids, acid fixing agents" specifies the requirements and quality control standards for acid fixing agents of aromatic sulfonic acid condensates in the color fixing processing of Spinning & weaving dyeing. The standard specifies in detail the test methods, inspection rules for acid fixing agents, and requirements in marking, labeling, Encasement, transportation and storage. It is suitable for the dyeing and fixing process of nylon, silk, wool and their blended fabrics to ensure that their colour fastness and dyeing effect meet the relevant standards. In addition, the standard also lists the normative reference documents that must be followed, including colour fastness test and analysis laboratory water specifications, etc.