With the chemical formula Na2SO4, sodium sulphate is a white, crystalline substance. It is offered in a variety of grades for a range of applications. Industrial, technical, and pharmaceutical grades of sodium sulphate are available. Sodium sulphate of industrial grade is frequently used in detergents, glass production, and textiles. Applications for technical grade sodium sulphate can be found in the water treatment industry, chemical manufacturing, and pulp and paper manufacture. Drugs and pharmaceutical preparations are made with sodium sulphate of the pharmaceutical grade. The grade that is chosen is determined by the particular specifications and purity standards of the intended use.