What is PPS?

 Poly(p-phenylene sulfide) (PPS) is a polymer made up of alternating sulfur atoms and phenylene rings in a para substitution pattern. The highly stable chemical bonds of its molecular structure impart a remarkable degree of molecular stability toward both thermal degradation and chemical reactivity. The molecular structure also readily packs into a very thermally stable crystalline lattice, hence PPS is a semi-crystalline polymer with a high crystalline melting point of about 285°C (545°F). Because of its molecular structure, PPS also tends to char during combustion, making the material inherently flame retardant. PPS has not been found to dissolve in any solvent at temperatures below about 200°C (392°F).   

When blended with glass fibers and other fillers, PPS produces engineering plastics having a unique combination of properties including:

  • A remarkable combination of both long-term and short-term thermal stability
  • Exceptionally high modulus and creep resistance
  • Outstanding resistance to a wide variety of aggressive chemical environments
  • Precision molding to tight tolerances with high reproducibility
  • Inherent non-flammability without flame retardant additives
  • Dielectric and insulating properties stable over a wide range of conditions

For more information see our TSM on Defining and Comparing PPS Types.

For more information on why to use Ryton PPS, see our topic "Why Use Ryton PPS?"