What You Need to Know About UHMW-PE

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.

Physical Property Data for UHMW-PE

Features of UHMW-PE

UHMW-PE (Ultra-High Molecular Weight Polyethylene) is a thermoplastic engineering plastic known for its outstanding sliding properties, wear resistance, and impact strength.

While standard polyethylene (PE) typically has a molecular weight between 200,000 and 300,000, UHMW-PE is engineered to reach between 1 million and 7 million. This extremely high molecular weight results in densely entangled chains, providing impact resistance that actually surpasses that of polycarbonate. Additionally, its self-lubricating nature and sliding performance—rivaled only by PTFE—make it a top choice for rollers, guide rails, and gears.

• 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.

Step Up Your Project with Yumoto Electric

Yumoto Electric manufactures custom UHMW-PE machined parts starting from a single piece. We have experience with over 200 materials, including metals such as aluminum alloys, stainless steel, molybdenum, and titanium; and engineering plastics including PEEK, POM, and MC Nylon.

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.