manufacture ISO certification high quality,competitive price. Mesh: 8-12, 16-24, 20-30. 30-40, 40-60, ... ,90%, 80% etcSpecific rotation+24.8~+25.3°Loss on drying≤0.5%Fe mg/kg≤5 mgSulphate (SO42-)≤0.05 ... %Pb mg/kg≤1 mgChloride(Cr)≤0.05%Mesh standard8-12, 16-24, 20,30,40, 40-60, 60 ...