Zhejiang Longyou Sihai Chemical Co., Ltd. is a leading hi-tech private stock enterprise in China for the research, development, production and application of phosphor-grouping/boron-grouping high efficient non-halogen environment-friendly flame retardants, including non-halogen phosphor-grouping/boron-grouping additive-type flame retardants, non-halogen phosphor-grouping mixed flame retardants, non-halogen single-ingredient organic phosphine flame retardants, inorganic super-fine modified flame retardants and related fine chemicals, etc. Our products are the promotion products of China in the period of "Twelfth-five-year-program", and obtain the certificate of ISO9001: 2002 quality system.