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Engineering Plastic

UHMW-PE

UHMW-PE is an ultra-high-molecular-weight polyethylene defined by extreme abrasion resistance, very low friction, and high impact toughness (350% elongation). Light at 0.94 density and fully chemically resistant, it is the standard wear material for liners, guides, and wear strips where surfaces must shed material and resist gouging in bulk-handling equipment.

How UHMW-PE machines

Rated 3.5/5 — it machines but is gummy and springy, tending to deflect under tool pressure and leave fuzzy edges. Use very sharp tools, positive rake, high speeds with light cuts, and good chip clearance. Its low stiffness makes holding tight tolerances harder, so allow for spring-back and fixture parts firmly.

Manufacturing & processing

Available via CNC and extrusion. Its ultra-high molecular weight means it cannot be conventionally melt-processed by injection molding — parts come from machined extruded or compression-molded stock (sheet, rod). This processing limitation is fundamental: design around machining from stock rather than expecting molded net shapes.

Typical applications

Best for wear pads, chute and hopper liners, conveyor guides, and wear strips in mining, material handling, and food processing. Its low friction lets bulk material slide freely while its abrasion resistance outlasts metal in sliding-wear service. Impact toughness also suits parts taking repeated knocks.

When to choose it

Choose UHMW-PE when sliding abrasion, low friction, and impact toughness dominate and tight tolerances are not critical. Choose a stiffer plastic or metal when dimensional precision or load-bearing rigidity matters. Avoid it above 80C and where its springiness prevents the close fits an application requires.

Suitable surface finishes

Common finishes for UHMW-PE: bead blasting, powder coating. Use the finish selector →

FAQ

Why can't UHMW-PE be injection molded?
Its ultra-high molecular weight gives a melt viscosity too high to flow through conventional injection molding. Instead, stock is made by compression molding or ram extrusion, then machined to shape. This is why UHMW parts are nearly always machined from sheet or rod rather than molded net-shape.
What makes UHMW-PE hard to machine accurately?
It is gummy and springy with low stiffness, so it deflects under cutting pressure and springs back after the tool passes, making tight tolerances difficult. Sharp tools, light cuts, high speeds, and firm fixturing help, but expect to design with looser tolerances than you would for a rigid plastic.
How does UHMW-PE compare for abrasion resistance?
UHMW-PE has outstanding abrasion resistance, often outlasting steel in sliding-wear service like chute liners and wear strips. Combined with a very low coefficient of friction, it lets bulk material slide freely while resisting gouging, which is why it dominates material-handling wear-component applications.

Property values are typical/nominal for early guidance and vary by temper, grade, supplier and heat treatment. Confirm critical specs against a certified datasheet or with an mfgiq engineer.