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Rule of Thumb: Choose UHMW when you need maximum abrasion resistance and a slick, non-stick wear surface for sliding and scraping. Choose Nylon when you need a stronger, stiffer engineering plastic for machined parts like gears and bushings—while accounting for moisture absorption.
UHMW (Ultra-High Molecular Weight Polyethylene)
UHMW (Ultra-High Molecular Weight Polyethylene) is a linear polyethylene with a molecular weight typically ranging from 3.5 to 7.5 million g/mol. This elevated molecular weight produces outstanding abrasion resistance—among the highest of any unfilled thermoplastic—combined with a low coefficient of friction, excellent impact toughness, and near-zero moisture absorption. UHMW resists most common chemicals, does not swell in wet environments, and performs across a broad service temperature range. Its relatively low tensile strength and stiffness compared to engineering-grade plastics make it most appropriate for wear surfaces, liners, guides, and impact-absorbing components rather than precision structural or power-transmission applications.
Nylon
Nylon (polyamide) is a semi-crystalline engineering thermoplastic offering a combination of tensile strength, stiffness, and wear resistance that makes it widely used for precision machined components. Common grades—Nylon 6 and Nylon 6/6—differ slightly in mechanical properties and processing behavior, but both exhibit the material's characteristic moisture absorption, which can cause dimensional growth and reduced mechanical performance in humid or wet service environments. Nylon's higher hardness and flexural modulus relative to UHMW make it better suited for load-bearing applications such as gears, bushings, rollers, and parts where tight machined tolerances are required.
UHMW Applications
- Chute, hopper, and truck bed liners
- Conveyor wear strips and guide rails
- Star wheels and idler sprockets
- Packaging and food processing machinery wear parts
- Marine dock fenders and pile guards
- Bumpers and impact pads
Nylon Applications
- Bearings, bushings, and thrust washers
- Gears, sprockets, and pulleys
- Rollers and sheaves
- Wear pads and slide plates
- Seals and gaskets
- Packaging and food processing machine components
| Characteristic | UHMW | Nylon |
|---|---|---|
| Good chemical resistance | ||
| Machinable and easy to fabricate | ||
| Outstanding abrasion resistance | ||
| Very low coefficient of friction | ||
| Near-zero moisture absorption | ||
| Exceptional impact toughness | ||
| Higher tensile strength and stiffness | ||
| Suited for precision bearing and gear applications | ||
| Lower coefficient of thermal expansion | ||
| Higher continuous service temperature |