Thai Polymer Supply Co.,Ltd We are a distributor of Hitachi vacuum pumps and air compressors as well as Hitachi screw compressor (Hiscrew & DSP) Hitachi established production of compressors in 1911 and has constantly evolved to suit new applications Thai Polymer Co.,Ltd is an official importer and distributor of Hitachi compressors directly from Japan, providing both excellent sales and after sales services.