... price and high quality 5. accept any inspect Ammonium Sulphate 20.5%. coking grade , Caprolactam grade 21%1.Technical specifications ... (dry basis),% ≥21.021.020.5Water content(H2O),% ≤0.20.31.0Free acid(H2SO4)content,% ≤0.030.050.20Alias: ammonium ... salt, diammonium sulfate.Properties: White or off-white granule, easily soluble in water. Aqueous solution appears acid. Insoluble in alcohol, acetone ...