1.carpolactam type 2.no caking and low moisture 3.low heavy metal 4.N:21%,S:24 Ammonium sulphate 21%Molecular Formula:(NH4)2SO4,Molecular Weight:132.13,Appearance: white crystal, N: 21% min;Free acid as H2SO4:0.03% max,Moisture:0.3% max,Packing:50kgs plastic woven bag,27MTs/20'FCL Applicant:1 fertilizer(NPK raw material)2 dying,chemical,leather,3 the raw material of ammonium persulfate , 4 ...