Hebei Hua Ao Chemical Co.,Ltd. main produce ammonium sulfate in China. And for the AS granular have exported to South America, Thailand, Singapore etc. Products name: Ammonium Sulphate Fertilizer Nitrogen content: 21 pct minimum Moisture: 1 pct maximum Molecular Formula: (NH4)2SO4 Appearance: Granular 2 -4mm If our products meet your needs feel free to contact us. Ms Jane Wei Tel:0086-318-8088518 Fax:0086-318-2197888