PTFE vs PPS: A Practical Guide to Choosing High-Temperature Plastics
Time of issue:2026-08-10 14:00
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You are designing a component that has to survive heat, chemicals, or both. Two names come up more than any others: PTFE and PPS. Both are called "high-temperature plastics," but they solve very different problems — and choosing the wrong one can mean rework, field failures, and a blown budget.
Here is what the datasheets usually don't tell you.
PTFE vs PPS at a Glance
| Property | PTFE (Polytetrafluoroethylene) | PPS (Polyphenylene Sulfide) |
|---|---|---|
| Continuous service temperature | -200°C to +260°C | 200–220°C (up to 260°C short-term) |
| Chemical resistance | Outstanding — inert to almost all chemicals | Excellent — especially organic solvents and acids |
| Mechanical strength | Low to moderate; soft and creep-prone | High; stiff and dimensionally stable |
| Coefficient of friction | Extremely low (0.05–0.10) | Moderate (0.2–0.4; lower when PTFE-filled) |
| Non-stick behavior | Yes | No |
| Flammability | Non-flammable | Inherently flame retardant (UL94 V-0) |
| Processability | Cannot be melt-processed; compression molding, paste extrusion, machining | Fully melt-processable: injection molding, extrusion |
| Moisture absorption | ≈ 0% | ≈ 0.02% |
| Typical cost position | Mid-range | Well below PEEK; strong value |
PTFE: The Chemical Champion
Discovered in 1938 by DuPont chemist Roy Plunkett, PTFE remains the reference for chemical inertness. It shrugs off almost every acid, base, and solvent known, and it keeps working from -200°C to +260°C.
Where PTFE wins
- The lowest coefficient of friction of any solid material (0.05–0.10)
- Non-stick surface behavior that nothing else matches
- Outstanding electrical insulation and high-frequency performance
- Biocompatibility proven over decades in medical implants and vascular grafts
- Essentially zero moisture absorption
Where PTFE struggles
- Low mechanical strength — it is soft and deforms under sustained load (cold flow / creep)
- Poor wear resistance in pure form; fillers (glass, carbon, bronze, graphite) are often required
- It cannot be injection molded. Melt viscosity is so high that parts must be compression molded, paste extruded, or machined from stock — which drives up unit cost for complex geometries
PPS: The Dimensional Workhorse
PPS is a semi-crystalline engineering polymer with an unusual combination: inherent flame retardancy, broad chemical resistance, and excellent dimensional stability — at a cost far below PEEK.
Where PPS wins
- Strong, stiff, and dimensionally stable; holds tight tolerances at temperature
- Outstanding resistance to organic solvents, fuels, and acids
- Inherently flame retardant (UL94 V-0) with no additives
- Fully melt-processable — injection molding and extrusion keep part costs low at volume
- Continuous service at 200–220°C, with short-term peaks to 260°C
- Very low moisture absorption, so properties don't drift with humidity
Where PPS struggles
- Unfilled PPS is brittle and notch-sensitive; glass or carbon fiber reinforcement is the norm for structural parts
- Friction is moderate — for low-friction needs, PTFE-filled PPS grades bridge the gap
- No non-stick behavior; surface energy is too high for release applications
How to Choose: A Decision Framework
Choose PTFE when
- The part must resist the widest possible range of chemicals, including strong acids and oxidizers
- You need non-stick or ultra-low-friction surfaces (seals, bearings, liners, release films)
- Service temperatures dip well below freezing, or reach the 250–260°C ceiling
- The part is static or lightly loaded, where creep is not a design risk
- Application is medical, semiconductor, or high-purity chemical handling
Choose PPS when
- The part carries structural or dynamic loads at high temperature
- You need tight dimensional stability and consistent properties under heat and humidity
- The application involves fuels, solvents, or automotive under-hood environments
- Volume production demands injection molding economics
- You want high performance at a substantially lower cost than PEEK
Many real designs use both: a PPS structural housing with a PTFE seal or liner — each material doing what it does best.
Three Misconceptions Worth Clearing Up
- "PTFE can be injection molded." It cannot. Its melt viscosity is orders of magnitude too high. If your design needs injection molding and PTFE-like chemical resistance, PFA or FEP are the melt-processable fluoropolymer alternatives.
- "PPS is only available in glass-filled grades." Unfilled, carbon-fiber-filled, and PTFE-filled grades all exist — and filler systems change mechanical and tribological behavior significantly. Selecting the right grade is as important as selecting the right polymer.
- "PTFE and PPS compete in every application." They overlap on temperature and chemical resistance, but they diverge on load-bearing ability and friction. Treating them as substitutes is how parts fail.
The Bottom Line
| Your priority | Start with |
|---|---|
| Maximum chemical + temperature range, lowest friction, non-stick | PTFE |
| Structural strength, dimensional stability, molding economics | PPS |
| Low friction in a load-bearing molded part | PTFE-filled PPS |
Not sure which material fits your application?
DOWREN supplies PTFE and PPS in powder and pellet form — along with TPE, TPU, TPV, TPEE and other engineering polymers — with technical support for grade selection. Send us your application details and we will recommend a grade, not a guess.
Contact TS DOWREN for Grade Recommendations & Samples → 📧 tech001@tsdowren.com | 🌐 www.dowren.com
Article by the TS DOWREN technical marketing team. Datasheet-level parameters are provided for initial screening; final material selection should be validated against official technical data and application testing.
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