Puyang Zhongwei Fine Chemical Co., Ltd, which belongs to Guangdong Dymatic Fine Chemical Joint Stocked, is located in the plains of oilfield with abundant raw materials Puyang city, Henan province.The company’s mainly products are hydrocarbon refrigerant and the raw materials, which has an annual output of 200,000 tons refrigerants and raw materials(R600a 99.9%, normal butane 99%, n-pentane 99%, cyclopentane 95%, isooctane 99%, new international extraction solvent, R433b(replace R22, A3)), R436a(replace R134a, A3), R 290, SC47C, SC134a(A2). Zhongwei is the biggest hydrocarbon refrigerant’s manufacturer in Asia.