flame retardant(FR), weather-ability(UV), heat resistance, high flow ability, high gloss etc. PP is one of the five general-purpose plastics. With ... list:Common engineering plastics: PC, ABS, PP, PPO, HIPS, PA6, PA66, PPS, POM, PET, PBTSpecial high polymer: PPA, PPS, PES, PEI, LCP ...