QINGDAO CHANGRONG CHEMICAL SCIENCE&TECHNOLOGY CO.,LTD. Is located in Chemical Zone, Pingdu Xinhe, Qingdao, P.R.China, is specializing in the production of phosphate series of flame-retardant agent, antioxidant agent, stabilizer products manufacturers. To date, most products export, export countries and regions including South Korea, Japan, Thailand, America, etc., and customer established stable long-term trade relations of cooperation. Warmly welcome friends from all walks of life both at home ...