This standard specifies the requirements, test methods, inspection rules, signs, labels, packaging, transportation and storage of feed grade calcium hydrogen phosphate. This standard applies to feed grade calcium hydrogen phosphate produced by neutralizing industrial phosphoric acid with milk of lime or calcium carbonate. Calcium hydrogen phosphate produced from toxic and harmful phosphoric acid is not suitable. This product is used as a calcium and phosphorus supplement in feed processing. Molecular formula: CaHPO|(4)·2H|(2)O Relative molecular mass: 172.10 (according to the 1995 international relative atomic mass)