This document specifies the requirements, test methods, inspection rules, marking, packaging, transportation and storage of glycerin (glycerin), a by-product of epoxy resin (referred to as by-product glycerol). This document applies to the by-product glycerol (glycerol) produced by evaporation and crystallization during the production of epoxy resin. Note: This product is mainly used for industrial purposes such as textile auxiliaries, cement grinding aids, antifreeze, epichlorohydrin and synthetic resins (alkyd resins), water treatment carbon sources, etc. It is not suitable for food, biomedicine and cosmetics, etc. industry.