Quick Answer
If your ball is failing from abrasion, use UHMWPE. If it is failing from chemical attack or high temperature, use PTFE. UHMWPE has among the highest abrasion resistance of any polymer — considerably better than PTFE — and costs less. PTFE wins decisively on chemical breadth and temperature range (260°C versus roughly 80°C).
Head-to-Head
| Property | PTFE | UHMWPE |
|---|---|---|
| Continuous service temperature | -200°C to +260°C | -200°C to ~+80°C |
| Abrasion resistance | Poor | Outstanding — among the best of any polymer |
| Chemical resistance | Near-universal | Good to acids, alkalis, salts; poor to strong oxidisers and aromatic/chlorinated solvents |
| Coefficient of friction | 0.04–0.10 | 0.10–0.22 |
| Impact strength | Moderate | Very high — effectively unbreakable |
| Density | 2.14–2.20 g/cm³ (sinks) | ~0.93–0.94 g/cm³ (floats) |
| Water absorption | < 0.01% | Negligible |
| Relative cost | Higher | Significantly lower |
Where UHMWPE Wins
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Abrasive slurry service. Mineral processing, mining reagent dosing, pigment and filler slurries — anywhere solids are suspended in the media.
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Impact loading. UHMWPE absorbs impact that would deform or damage PTFE.
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Buoyancy without hollow construction. UHMWPE floats naturally; solid PTFE does not.
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Cost. Substantially cheaper as a raw material, and longer-lived in abrasive duty — so cheaper twice over where it suits.
Where PTFE Wins
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Temperature above about 80°C. UHMWPE softens and loses form well before PTFE is troubled.
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Strong oxidisers and aromatic or chlorinated solvents. These attack UHMWPE; PTFE shrugs them off.
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Very low friction requirements. PTFE’s friction coefficient is roughly half UHMWPE’s.
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Regulated food and pharmaceutical contact. Virgin PTFE has the better-established documentation path.
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Cryogenic duty. Both handle low temperature, but PTFE has the broader qualification history.
Diagnosing Which You Need
The worn ball tells you. This is the most reliable diagnostic available and it takes seconds:
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Uniform surface erosion, dulling, gradual undersize, visible scoring → abrasion. UHMWPE will last longer and cost less.
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Swelling, softening, cracking, discolouration, embrittlement → chemical attack. Stay with PTFE.
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Flat spot at the seat contact, rest of the ball intact → cold flow. Neither material fixes this well; move to filled PTFE or PEEK.
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Melted, distorted or heavily discoloured → thermal. UHMWPE is definitively wrong; check whether you are within PTFE’s limit too.
We manufacture both PTFE and UHMWPE balls, so if you send us a worn sample we will tell you which one your process actually needs — including when that answer is the cheaper material.
The Cost Case
In abrasive service the economics are usually not close. UHMWPE costs less per piece and lasts several times longer, so the cost per operating hour can be a small fraction of PTFE’s. Buyers frequently continue specifying PTFE in these applications out of habit, or because “PTFE is the premium material” — which is true chemically and untrue mechanically. In a slurry line, PTFE is the wrong premium.
Related Reading
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UHMWPE Balls (/uhmwpe-ball) — product specifications
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Engineering Plastic Balls (/engineering-plastic-balls) — the full polymer range
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Common Failure Modes (/common-failure-modes) — diagnosing wear patterns
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PTFE Material Properties (/ptfe-material-properties)
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PTFE Ball Selection Guide (/ptfe-ball-selection-guide)