... density 2.662 g / cm 3. Melting point 1069 °C, soluble in water. Moisture absorption is small, uneasy caking, good physical ... properties, easy application, is a good water-soluble potash.[Appearance]1) Industrial Grade Potassium Sulphate: colorless or white ... point 1069 °C, boiling point 1689 °C. Soluble in water is not soluble in alcohol, acetone and carbon disulfide. A bitter salty.2 ...