Ammonium Sulphate

*Appearance:White crystal
*Nitrogen(N):≥21.0%
*Moisture（H2O):≤1.0%
*Free acid( H2SO4 ):≤0.3%--0.4%
*Iron(Fe):≤0.007%
*Arsenic(As):≤0.00005%
*Heavy metal(Pb):≤ 0.005%
*Water not dissolve substance:≤0.01%