Polysulfide and sulphonated
ISO 9001 DNV GL Certification Mark

Polysulfide and sulphonated

Polysulfide: PPS

(Polyphenylene sulfide)

PPS is an engineering plastic in which sulphur atoms bind aromatic elements between them. It is semi-crystalline, expensive and requires special measures to allow for moulding. On the other hand, it has specific properties that make it suitable for corrosive liquid pump impellers, i.e. products that must resist to the action of hot water and detergents and for the blades of electric heater fans. It has excellent resistance to chemical agents, high temperatures, and flames, and good electric properties.


We at Crea use it with glass fillers. It increases its performance in terms of dimensional stability, hardness, and thermal resistance, which are already high.

Benefits of PPS:

  • excellent resistance to chemical agents
    insoluble in all solvents up to +150/+180 °C
  • high melting point (it does not burn according to normal industrial methods)
  • suitable for operating continuously also at 230 °C
  • extremely low water absorption properties
  • intrinsically fire-proof
  • hydrolysis resistant
  • extremely hard and rigid
  • high dimensional stability.


Used for high temperature technological applications and/or that require resistance to aggressive chemical agents, such as in components for the automotive industry, pumps, valves, for the electric industry, micro-wave ovens, etc.

Sulphonated polymers: PES and PSU

Sulphonated polymers are high performance aromatic thermoplastic and transparent resins featuring sulphone. They are high temperature resistant. PSU (polysulphone) and PES (polyethersulphone) belong to this family.

Benefits of PES and PSU:

  • excellent impact resistance
  • excellent resistance to high and low temperatures
  • excellent electric properties (good isolators)
  • transparency
  • intrinsically self-extinguishing and extremely low smoke emissions in contact with flame
  • resistant to solvents, chemicals, and grease
  • resistant to hydrolysis and low water absorption properties
  • good mechanical properties and excellent dimensional stability
  • non-toxic

PES is better as it has: greater thermal resistance than PSU.

PSU is better as it has: greater transparency/a more neutral colour compared to PES, which is slightly amber.


Both PSU and PES are widely used in the hydraulic industry, as they are suitable for applications in contact with hot water. Both PES and PSU are used for applications requiring excellent temperature resistance also for prolonged use and/or in contact with steam and boiling water (as they have excellent hydrolysis resistance). They are also used in the automotive, household appliance industries (as insulators in capacitors) and to manufacture food containers, artificial membranes, etc. They are also used in the medical industry, as they are resistant to sterilisation cycles.