Appearance: White crystal
Main content: 99. 5% min
Mg: 9. 6% min
S: 12. 9% min
pH(5W/V%Sol): 4. 5-6. 5
Chloride: 0. 015% max
Iron(Fe): 0. 005% max
Heavy metal (Pb): 0. 002 % max
Arsenic(As): 0. 0002% max
Insoluble: 0. 001% max
Size (mm): 0. 1-1