Re:potassium nitrate-industrial grade Spec: purity: 99.8pct.Min. Moisture: 0.10pct.Max. Chloride content: 0.02pct.Max. Insoluble matter in water: 0.01pct.Max. Sulphate content: 0.005pct.Max. Iron: 0.003pct.Max. Re:potassium nitrate-fertilizer grade Spec: potassium oxide: 46.0pct.Min. Nitrogen: 13.0pct.Min. Chloride: 0.1pct.Max. In 25kg or 50kg pp/pe bags