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Rule of Thumb: Choose UHMW for impact + abrasion in conveyors, liners, and wear strips. Choose PTFE when you need the lowest friction, best chemical resistance, and higher temperature performance for seals, gaskets, and sliding components.
UHMW (Ultra-High Molecular Weight Polyethylene)
UHMW (Ultra-High Molecular Weight Polyethylene) is a semi-crystalline thermoplastic distinguished by a molecular weight typically ranging from 3.5 to 7.5 million g/mol. This structure produces outstanding abrasion resistance, high impact toughness, and a low coefficient of friction. UHMW does not absorb moisture and performs reliably in wet, abrasive, and dirty environments. Its continuous service temperature is limited to approximately 180-200°F (82-93°C). UHMW is the appropriate choice for wear-intensive applications—such as conveyor liners, guide rails, and chute liners—where mechanical impact and abrasion are the primary design concerns rather than extreme temperature or aggressive chemical exposure.
PTFE (Polytetrafluoroethylene)
PTFE (Polytetrafluoroethylene) is a fully fluorinated thermoplastic fluoropolymer with an inherently inert molecular structure. It exhibits the lowest coefficient of friction of any common engineering plastic and resists virtually all industrial chemicals, acids, and solvents. PTFE operates continuously up to approximately 500°F (260°C), making it suitable for elevated-temperature applications where UHMW would be inadequate. Its primary limitations include a tendency to cold flow (creep) under sustained mechanical load and lower abrasion resistance compared to UHMW in heavy-wear scenarios. PTFE is the appropriate selection for seals, gaskets, valve seats, and chemical-contact components where chemical inertness and thermal performance are the governing requirements.
UHMW Applications
- Conveyor wear strips and guide rails
- Chute, hopper, and truck bed liners
- Packaging and food processing machinery parts
- Star wheels and idler sprockets
- Dock fenders, pile guards, and marine bumpers
- Impact and abrasion-resistant liners
PTFE Applications
- Seals, gaskets, and valve seats
- Pump components and fluid handling manifolds
- Bearings and bushings (filled bearing grades)
- Chemical processing equipment liners
- Semiconductor and laboratory equipment components
- Electrical insulation components
| Characteristic | UHMW | PTFE |
|---|---|---|
| Low coefficient of friction | ||
| Good chemical resistance | ||
| Low moisture absorption | ||
| Excellent abrasion resistance | ||
| High impact resistance | ||
| Easy to machine and fabricate | ||
| High continuous service temperature | ||
| Electrical insulation | ||
| Good weathering resistance |