PQ Chemicals (Thailand) Limited or PQCT manufactures, sells, exports and distributes zeolite, Valfor 100 for laundry detergent, and a range of specialty zeolites. PQCT is a wholly owned subsidiary of the PQ Corporation in Malvern, PA. Initially a 20,000 ton/a zeolite plant started production in 1993 ... อ่านต่อ