The product has the following characteristics: the purity degree is high,CEPPA content 99%, which is the highest in domestic market. ② the slice produced through polymerization which endures spinning ,dying etc.processes will not lowerthe function of flame retardant. ③it can spin thin and long silk ④the environmental protecting permanent type polyester slice made from it .doesn't contain halogens, it has the feature of being easy to be carbonized while buring. The smoke density is 1/3 of the common polyester. It's a product which can protect the environment and has low smoke ,no toxicity. The flame retardant of our company is copolymerization 朿ategory of phosphorous-family. This product is white crystal grain of high purity .its melting point is 158℃,its heat resolution temperature is 250℃. this product is sold as solid powder, and it also sells to the users who don't have the condition to transfer flame retardant using the form of EG ester solution which contains 45% flame retardant. item index item Index Apppearance White crystal Water content ≤0.2 Melting point ≥158℃ Phosphorus content 14.0?.5 Acid value 522.0 ?.0 Iron content ≤0.02