We are offering ammonium sulphate. Ammonium sulphate has ph value is 5.5 in 0.1m solution. Density 1.769 gcm3 (20c). Ammonium sulphate is hygroscopic; soluble in water; insoluble in acetone, alcohol and ether. Main active ingredients are 21% nitrogen and 24% sulfur, so it can be described as npk 21-0-0 24s. Generally, it is a by-product from chemical (cyanuric acid, capro, acrylonitrile, sodium cyanide, monosodium glutamate-msg, methyl methacrylate-mma, etc.) or steel plant. Steel grade (also call coke-ovens grade) is fine white powder. After processing it can be white granular or flake. Caprolactam grade is colorless (achromatic) crystalline or yellowish crystals.