Mag Excel Exports Private Limited supplies White Crystalline Non-flammable Potassium Sulphate. Mag Excel Exports Private Limited has obtained ISO 9001:2000 certifications. White Crystalline Non-flammable Potassium Sulphate is generally used in fertilizers that consist of both potassium and sulphur. White Crystalline Non-flammable Potassium Sulphate is also used occasionally in the manufacture of glass. It is soluble in water.