A Guide to UHMW-PE CNC Machining: Properties, Grades, and Applications
Last updated : 2026/7/13
Key Takeaways
UHMW-PE offers exceptional lubricity, second only to fluororesins (like PTFE), making it ideal for sliding components.
It has a high coefficient of linear expansion and limited heat resistance, with a continuous operating temperature of 80°C (176°F).
Due to its tendency to develop fine burrs that are difficult to remove, extra care is required to maintain tight tolerances and part accuracy.
What is Ultra-High Molecular Weight Polyethylene?
Ultra-High Molecular Weight Polyethylene (UHMW-PE) is a super-engineering plastic known for its outstanding sliding properties, wear resistance, and impact strength.
It has a molecular weight ranging from 1–7 million, compared to 200,000–300,000 for standard polyethylene. This extremely high molecular weight results in densely entangled chains, providing impact resistance that surpasses that of polycarbonate, and superior wear resistance compared to materials like MC Nylon.
Additionally, its self-lubricating nature and sliding performance—rivaled only by PTFE—make it a top choice for rollers, guide rails, and gears.
The material is typically available in a standard white grade, with black and green options also available. Specialty grades offer enhanced properties for specific applications, including conductivity, low friction, and wear resistance.
Superior sliding properties and wear resistance
Exceptional impact strength
High electrical insulation
Outstanding chemical resistance
UHMW-PE Grades
In addition to the standard grade, UHMW-PE is available in specialized formulations to enhance performance for specific environments:
Standard Grade
Anti-Static Grade
Conductive Grade
High-Sliding Grade
Wear-Resistant Grade
Considerations for Material Selection
UHMW-PE has a high coefficient of linear thermal expansion, meaning it is highly susceptible to dimensional changes when temperatures fluctuate. Consequently, it is not recommended for applications in environments with significant temperature swings. Its heat resistance is also relatively low, with a continuous operating temperature limit of 80°C (176°F).
During the machining process, the material tends to produce fine burrs that are difficult to remove. If your project involves parts with small holes or channels for gas and liquid flow, it is critical to account for potential precision issues during the design and manufacturing phase.
Dimensional Instability: Significant expansion and contraction with temperature changes.
Limited Heat Resistance: Maximum continuous operating temperature of 80°C.
Burr Formation: Prone to fine burrs during cutting, which complicates finishing.
Physical Property Data for UHMW-PE
Property | Unit | Test Method | Value |
|---|---|---|---|
Specific Gravity | — | — | 0.94 |
Tensile Strength | MPa | D638 | 38 |
Elongation at Break | % | D638 | 420–530 |
Impact Strength (Izod, Notched) | J/m | D256 | Non-breaking |
Hardness (Rockwell) | — | D785 | R50` |
Coefficient of Linear Expansion | x10⁻⁵/°C | D696 | 13 |
Volume Resistivity | Ω·cm | D257 | >10¹⁶ |
Dielectric Strength | KV/mm | D149 | — |
Official Names and Abbreviations
Term | Notes |
|---|---|
Ultra High Molecular Weight Polyethylene | Full official name |
UHMW-PE | Common abbreviation |
U-PE / UPE / UHMW | Alternative abbreviations, all referring to the same material |
Standard and Specialty Grades
Grade Type | Description | Color Options |
|---|---|---|
Standard Grade | General-purpose UHMW-PE | White (standard), Black, Green |
Specialized Grades | Conductive | White, Black, Green |
Low-Friction | White, Black, Green | |
Enhanced Wear Resistance | White, Black, Green |
These options allow engineers to tailor the material to specific performance requirements in industrial or high-wear applications.
UHMW-PE CNC Machining at Yumoto Electric
Yumoto Electric delivers high-quality components fast, worldwide. We provide precision machining for a wide range of engineering plastics, including PEEK, PPS, MC Nylon, and POM.
If you’re unsure about material selection or machining methods, we offer complimentary consultations to help optimize your design and production. For any questions, please feel free to contact us.
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