Established in 1996, Grand Siam Composites Company Limited (GSC) is a major producer of polypropylene compound resins in Southeast Asia.
GSC is a joint venture of SCG Chemicals Company Limited, Mitsui Chemicals Inc and Prime Polymer Co., Ltd. SCG Chemicals Company Limited is one of the largest integrated producers of petrochemical products in Thailand. On the other hand, Mitsui Chemicals has an excellent reputation as one of the worlds leading chemical companies. At last, Prime Polymer Co., Ltd. is a merged company of Mitsui Chemicals and Idemitsu Kosan to strengthen the global expansion business of polyolefin products.