First, the chemical name: * ammonium Second, the formula:. (NH4) 2SO4 Third, MW: 132.14 four, CAS: 7783-20-2 five properties: colorless crystal or white particles. Odorless. 280 ℃ or more decomposition. Solubility in water: 0 ℃ when 41.22g, 25 ℃ when 43.47g, 100 ℃ when 50.42g. pH 5.5. The relative density of 1.77. Sixth, use: water softener; yeast food. 7, Packing: lined with polyethylene plastic bag, coat plastic woven bag of 25Kg. Eight, storage and transportation: It should be stored in a dry, ventilated and clean warehouse, kept away from moisture, heat, transport to prevent rain and moisture, should be stored separately from poisonous substances. Specifications GB29206-2012 content quality indicators ((NH4) 2SO4), w /% ≥ Content ((NH4) 2SO4) 99.0-100.5 residue on ignition, w /% ≤ Ignition Residue 0.25 arsenic (As), mg / kg ≤ Arsenic ( As) 3 selenium (Se), mg / kg ≤ Se 30 of lead (Pb), mg / kg ≤ Pb 3