Heat Resistant PPS Granules for Automotive Under-Hood Parts

PPS Granules  Polyphenylene sulfide, commonly referred to as PPS, is a semi-crystalline thermoplastic with a polymeric structure that gives it a remarkable degree of chemical resistance. In fact, there are no known solvents for this high-performance thermoplastic below 392°F (200°C). Its other notable attributes are its inherent flame resistance, electrical properties and its high mechanical strength. Most commercial grades of PPS achieve a UL 94 V-0 flammability rating without flame-retardant additives.

While the unmodified PPS polymer exhibits good all-around performance, the addition of fiber-reinforcement significantly boosts its toughness, structural and thermal properties. A two-fold increase in heat deflection temperature and more than triple the flexural modulus are the main reasons for the far greater usage of 40% glass fiber-reinforced PPS over unfilled grades for load bearing molded and machined parts exposed to higher thermal conditions.