Duran Chemicals was set up in Nov. 1998 The predecessor was Guangdong Chemical Raw Materials Co., Ltd., which started to sell imported refrigerants in 1988 Repackaging and production facilities ? Workshop and office building ? Returnable cylinders ? Repackaging and business certificate. ? Duran got the certificate from the custom for duty free processing of import materials. It is the first refrigerant trading company in China to get such kind of certificate.