PPS Thermoplastic Composite Resin (Polyphenylene Sulfide)
Key Features
- Inherent UL94 V-0 flammability — no FR additive migration or blooming
- Outstanding chemical resistance to fuels, acids, and organic solvents
- 200-220°C continuous service — exceeds PA6/PA12 and most thermosets
- Very low moisture absorption (<0.05%) — excellent dimensional stability
- Lower processing temperature than PEEK (300-340°C vs. 370-400°C)
Polyphenylene Sulfide (PPS, CAS 26125-40-6) is a semi-crystalline thermoplastic polymer with exceptionally high chemical resistance, inherent flame retardancy, and good mechanical performance up to 200-220°C continuous service temperature. PPS is the lower-cost alternative to PEEK for applications requiring the combination of chemical resistance, flame retardancy, and elevated service temperature that is unachievable with PA6 or PA12 composites.
PPS melting point is 285°C, processed at 300-340°C — significantly lower than PEEK (370-400°C), enabling use with more standard injection molding and composite processing equipment. The inherent UL94 V-0 flammability rating (no flame retardant additives needed) and high limiting oxygen index (LOI ~44%) make PPS composites valuable in applications where flame retardancy and chemical resistance are simultaneously required.
Short fiber-reinforced PPS compounds (PPS-GF40, PPS-CF40) provide tensile strength 120-160 MPa, flexural modulus 12-16 GPa (GF) and 18-25 GPa (CF), and excellent dimensional stability due to the semi-crystalline structure. Continuous fiber PPS composites (CF/PPS, GF/PPS tapes and woven) are used in aerospace secondary structures, automotive under-the-hood components, and chemical process equipment where fuel, acid, and solvent resistance are required at elevated temperature. Glass/PPS thermoplastic composites are the structural material basis of Fokker's GLARE concept and several Airbus secondary structures.
Specifications
| Parameter | Value |
|---|---|
| Melting Point | 285°C |
| UL94 Flammability | V-0 (inherent, no FR additive) |
| Processing Temperature | 300-340°C |
| Water Absorption (23°C, 24h) | <0.05% |
| Continuous Service Temperature | 200-220°C |
| Flexural Modulus (GF40-reinforced) | 12-16 GPa |
| Tensile Strength (GF40-reinforced) | 120-160 MPa |
Applications
FAQ
PPS chemical resistance comparison at 100°C service: PA6/PA12 — attacked by strong acids (HCl, H2SO4 >10%), aldehydes, phenols, and oxidizing agents; significant swelling in chlorinated solvents; attacked by hot aromatic hydrocarbons. PPS — resists virtually all organic solvents below 200°C (no known solvent below 200°C dissolves crystalline PPS), resists 10% H2SO4, HCl, HNO3 at room temperature (concentration-dependent), and resists fuels, lubricants, and hydraulic fluids at elevated temperature. This broad chemical resistance combined with 200°C service temperature makes PPS-GF compounds the standard material for chemical pump components, valve bodies, and process equipment fittings where PA6 failure modes include chemical dissolution, swelling, and dimensional loss. PPS is also preferred for fuel system components (EPA fuel permeation requirements) where PA6 shows higher fuel permeation than PPS.
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