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Rule of Thumb: Choose Acetal if you need high-strength parts that must hold tight tolerances and resist creep. Choose UHMW if you need a durable impact resistant surface that will be hit, rubbed, or scraped by heavy machinery.
Acetal (Polyoxymethylene)
Acetal is a high-performance semi-crystalline engineering thermoplastic characterized by its high tensile strength, rigidity, and dimensional stability. Often selected for precision components, it features a low coefficient of friction and excellent wear resistance in dry environments. Unlike many other plastics, Acetal exhibits minimal moisture absorption, allowing it to maintain tight tolerances and mechanical integrity even when submerged or in high-humidity applications. It is chemically resistant to many fuels, solvents, and neutral organics, making it the industry standard for gears, bushings, and electrical insulators where "creep" resistance is critical.
UHMW (Ultra-High Molecular Weight Polyethylene)
UHMW is a linear polyethylene with an extremely high molecular mass, resulting in a material with unsurpassed impact strength and abrasion resistance. It is engineered for heavy-duty industrial environments where friction reduction and durability are paramount. UHMW is virtually self-lubricating and possesses a surface so slick that very few materials can adhere to it. While it has lower structural stiffness and a lower continuous-service temperature than Acetal, it excels in chemical resistance, particularly against corrosive acids and alkalis. It does not absorb water. This makes it the ideal choice for wear strips, conveyor guides, and liners subjected to high-velocity impact or abrasive slurry.
Acetal Applications
- Bearings and bushings
- Pump and valve parts
- Manifolds
- Gears
- Jigs and fixtures
- Food processing and other packaging machinery parts
- Wear pads
- Electrical components
UHMW Applications
- Chute, hopper, and truck bed liners
- Wear strips and guide rails
- Star wheels and idler sprockets
- High-speed conveyors
- Packaging machinery parts
- Food processing machinery parts
- Material handling machinery parts
- Bumpers, pile guards, and dock fenders
| Characteristic | Acetal | UHMW |
|---|---|---|
| Good chemical resistance | ||
| Easy to Fabricate | ||
| Good for friction and wear | ||
| Easy to machine | ||
| Good for bearings | ||
| Strong and stiff | ||
| Good electrical insulation | ||
| Low moisture absorption |