ZDP is a new type of phosphorus flame retardant, with high phosphorus content, good thermal stability, and good compatibility with polymers. It is suitable for permanent flame retardant polyester chips, filaments, staple fibers, films, etc. For polyester products, the flame-retardant polyester chips obtained have good hue, good spinnability, good fiber strength and good dyeability. Spinning can be processed by any spinning system. This product is especially suitable for the halogen-free flame retardant of PET fiber fabric and PET film system. It has the characteristics of good spinnability, continuous filament, good fiber strength, and good dyeability. It can also be used for PBT and PET injection molding.