Technical standad(GB1626-88)
Appearance: WhiteCrystals
Package: 25kg net in plastic wovenbags lined with plastic bags

index Wonderful grade Firstgrade Up to grade
purity% ≥ 99.6 99.4 99.0
sulphate group % ≤ 0.08 0.100.20
ignition (850 o C) % ≤ 0.08 0.100.20
heavy metal % ≤ 0.001 0.0020.02
Iron content % ≤ 0.0012 0.0020.01
chlorides % ≤ 0.003 0.0040.01
calcium % ≤ 0.0012 / /