Siam PVS Chemicals Co.,Ltd. (SPVS) The plant utilizes advanced membrane technology that enables the supply of high quality caustic soda, liquid chlorine,sodium hypochlorite, basic raw materials for major Thai industries such as textiles and rayon, pulp and paper, monosodium glutamate, foods and drinks, soaps and detergents, chemicals, steel and water treatment. The company's quality conforms to the requirements of the Thai Industrial Standards Institute.