Purity 99.50 99.63 sulpate 0.05 0.029 iron 0.0025 0.0003 Heavy metals 0.0010 0.0002 Insoluble in the water 0.02 0.006 loss on drying 0.10 0.036 Look White crystalline substance 3.The regular package - sulfamic acid 99.5% CAS:5329-14-6 Our regular package is 25kg/bag,27 MT for one container. 4.The FOB Shanghai: 550USD/MT.