Located in Puyang (health city of China), Puyang Chengke Chemical Science And Technology Co., Ltd. enjoys good location for it is close to national highway 106 and Puhe expressway. Chengke now has 140 employees and all managers and technicians have year''s experiences in phosphorus chemical industry. Following the developing trend of fire-retarding agent industry and adopting the leading technologies of Halogen-Free fire-retarding agent, we successfully developed a series of environment-friendly Halogen-Free fire-retarding agents, including APP-II type ammonium polyphosphates with high degree polymerization , Melamine coated ammonium polyphosphate and Melamine Cyanurate (MCA), etc; especially, APP-II type ammonium polyphosphates with high degree polymerization is the national leading produ..