Overview
UHMW-PE (Ultra-High Molecular Weight Polyethylene) is a premium engineering thermoplastic renowned for its exceptional wear resistance, impact strength, low friction, chemical resistance, and self-lubricating properties.
With a molecular weight typically ranging from 3 to 10 million g/mol, UHMW-PE significantly outperforms standard HDPE in abrasion resistance and impact toughness. It is often used as a lightweight alternative to metal in demanding industrial environments.
UHMW-PE is widely used in:
- Conveyor Systems
- Wear Strips and Guide Rails
- Bearings and Bushings
- Food Processing Equipment
- Mining and Bulk Material Handling
- Marine Components
- Medical Implants
- Industrial Machinery Parts
Due to its outstanding durability and low maintenance requirements, UHMW-PE is considered one of the best wear-resistant plastics available.
Material Specification
| Property | Value |
|---|---|
| Material Designation | UHMW-PE |
| Full Name | Ultra-High Molecular Weight Polyethylene |
| Common Name | UHMWPE |
| Material Family | Polyethylene Thermoplastic |
| Molecular Weight | 3–10 Million g/mol |
| Density | 0.93–0.94 g/cm³ |
| Appearance | Natural, White, Black, Colored |
| Typical Manufacturing Methods | Compression Molding, Ram Extrusion, CNC Machining |
| Standard Forms | Sheet, Rod, Tube, Profiles |
Chemical Composition
UHMW-PE consists of extremely long polyethylene molecular chains that provide outstanding wear and impact performance.
| Component | Function |
|---|---|
| UHMW Polyethylene Polymer | Structural Matrix |
| UV Stabilizers (Optional) | Outdoor Durability |
| Antistatic Additives (Optional) | Static Control |
| Colorants | Appearance Enhancement |
Common specialty grades include:
- Virgin UHMW-PE
- Reprocessed UHMW-PE
- Antistatic UHMW-PE
- Conductive UHMW-PE
- FDA Food Grade UHMW-PE
Mechanical Properties
Typical Values
| Property | Value |
|---|---|
| Tensile Strength | 35–45 MPa |
| Yield Strength | 20–30 MPa |
| Elongation at Break | 300–500% |
| Flexural Strength | 20–35 MPa |
| Flexural Modulus | 0.6–1.0 GPa |
| Hardness | Shore D 60–70 |
| Impact Strength | Virtually Unbreakable |
Typical Mechanical Performance
| Property | Performance |
|---|---|
| Toughness | Outstanding |
| Impact Resistance | Outstanding |
| Fatigue Resistance | Excellent |
| Crack Resistance | Outstanding |
UHMW-PE exhibits one of the highest impact strengths of any thermoplastic.
Physical Properties
| Property | Value |
|---|---|
| Density | 0.93–0.94 g/cm³ |
| Water Absorption | <0.01% |
| Thermal Conductivity | 0.40–0.45 W/m·K |
| Electrical Resistivity | >10¹⁵ Ω·cm |
| Specific Heat Capacity | 2200 J/kg·K |
UHMW-PE is lightweight while offering exceptional durability.
Thermal Properties
| Property | Value |
|---|---|
| Melting Point | 130–136°C |
| Heat Deflection Temperature | 40–85°C |
| Continuous Service Temperature | -150°C to 80°C |
| Short-Term Service Temperature | Up to 100°C |
UHMW-PE performs exceptionally well in cryogenic and low-temperature environments.
Strength-to-Weight Ratio
| Material | Density (g/cm³) | Tensile Strength |
|---|---|---|
| UHMW-PE | 0.94 | 40 MPa |
| HDPE | 0.95 | 30 MPa |
| Nylon 66 | 1.14 | 90 MPa |
| Aluminum 6061 | 2.70 | 310 MPa |
UHMW-PE offers exceptional durability while remaining extremely lightweight.
Wear Resistance
| Property | Performance |
|---|---|
| Abrasion Resistance | Outstanding |
| Sliding Wear Resistance | Outstanding |
| Surface Durability | Outstanding |
| Material Handling Performance | Outstanding |
UHMW-PE is often considered the benchmark for wear-resistant plastics.
Friction Properties
| Property | Value |
|---|---|
| Coefficient of Friction | 0.10–0.22 |
| Self-Lubricating | Yes |
| Dry Running Capability | Excellent |
| Noise Reduction | Excellent |
Its low friction characteristics reduce wear and energy consumption in moving systems.
Impact Resistance
| Property | Rating |
|---|---|
| Room Temperature Impact | Outstanding |
| Low Temperature Impact | Outstanding |
| Drop Resistance | Outstanding |
| Crack Resistance | Outstanding |
UHMW-PE maintains impact resistance even at temperatures below -100°C.
Chemical Resistance
| Chemical Environment | Performance |
|---|---|
| Water | Excellent |
| Acids | Excellent |
| Alkalis | Excellent |
| Salt Solutions | Excellent |
| Alcohols | Excellent |
| Oils & Greases | Excellent |
| Organic Solvents | Good |
| Strong Oxidizers | Fair |
UHMW-PE is highly resistant to most industrial chemicals.
Moisture Resistance
| Property | Performance |
|---|---|
| Water Absorption | Outstanding |
| Humidity Resistance | Outstanding |
| Corrosion Resistance | Outstanding |
| Environmental Stability | Excellent |
Virtually zero moisture absorption contributes to excellent dimensional stability.
Electrical Properties
| Property | Value |
|---|---|
| Volume Resistivity | >10¹⁵ Ω·cm |
| Surface Resistivity | >10¹⁴ Ω |
| Dielectric Strength | 20–50 kV/mm |
| Dielectric Constant | 2.2–2.4 |
UHMW-PE provides excellent electrical insulation performance.
Machinability
| Process | Rating |
|---|---|
| CNC Milling | Excellent |
| CNC Turning | Excellent |
| Drilling | Excellent |
| Routing | Excellent |
| Welding | Good |
Machinability Comparison
| Material | Machinability |
|---|---|
| UHMW-PE | Excellent |
| HDPE | Excellent |
| POM | Outstanding |
| Nylon | Excellent |
UHMW-PE can be machined into complex wear components with ease.
Manufacturing Characteristics
| Manufacturing Process | Rating |
|---|---|
| Compression Molding | Outstanding |
| Ram Extrusion | Outstanding |
| CNC Machining | Excellent |
| Thermoforming | Moderate |
| Injection Molding | Not Common |
Due to its extremely high molecular weight, UHMW-PE is typically not injection molded.
International Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ISO | UHMW-PE |
| ASTM | Ultra-High Molecular Weight Polyethylene |
| DIN | PE-UHMW |
| JIS | UHMWPE |
| GB/T (China) | 超高分子量聚乙烯（UHMWPE） |
| FDA | Food Grade UHMW-PE Available |
Available Forms
| Product Type | Availability |
|---|---|
| Sheet | Yes |
| Rod | Yes |
| Tube | Yes |
| Profiles | Yes |
| Compression Molded Parts | Yes |
| Machined Components | Yes |
Typical Applications
Material Handling Industry
- Conveyor Wear Strips
- Guide Rails
- Chain Guides
- Hopper Liners
Mining Industry
- Chute Liners
- Impact Plates
- Bulk Material Handling Components
Food Processing
- Conveyor Components
- Cutting Surfaces
- FDA-Compliant Wear Parts
Marine Industry
- Dock Fenders
- Wear Pads
- Sliding Components
Medical Industry
- Joint Replacement Components
- Orthopedic Implants
- Surgical Equipment Parts
Industrial Machinery
- Bearings
- Bushings
- Rollers
- Wear Plates
Manufacturing Characteristics
| Manufacturing Process | Rating |
|---|---|
| CNC Machining | Excellent |
| Compression Molding | Outstanding |
| Ram Extrusion | Outstanding |
| Secondary Fabrication | Excellent |
Advantages
Outstanding Wear Resistance
Among the highest abrasion resistance of all thermoplastics.
Exceptional Impact Strength
Virtually unbreakable under normal operating conditions.
Extremely Low Friction
Excellent self-lubricating performance.
Outstanding Chemical Resistance
Suitable for harsh industrial environments.
Lightweight
Much lighter than metal alternatives.
Food and Medical Compatibility
Available in FDA-compliant and medical-grade formulations.
Limitations
Limited Heat Resistance
Not suitable for continuous high-temperature applications.
Lower Structural Stiffness
Less rigid than POM, Nylon, or Polycarbonate.
Difficult Bonding
Adhesive bonding can be challenging.
High Thermal Expansion
Greater dimensional movement compared to engineering plastics.
Comparison with Common Engineering Plastics
| Property | UHMW-PE | HDPE | POM | PA66 |
|---|---|---|---|---|
| Wear Resistance | Outstanding | Good | Excellent | Excellent |
| Impact Resistance | Outstanding | Excellent | Good | Excellent |
| Friction Coefficient | Lowest | Low | Low | Moderate |
| Moisture Resistance | Outstanding | Outstanding | Excellent | Moderate |
| Chemical Resistance | Excellent | Excellent | Good | Good |
Comparison with HDPE
| Property | UHMW-PE | HDPE |
|---|---|---|
| Molecular Weight | Much Higher | Standard |
| Wear Resistance | Outstanding | Good |
| Impact Resistance | Outstanding | Excellent |
| Cost | Higher | Lower |
| Processing Ease | More Difficult | Easier |
Available Surface Finishes
Standard Finishes
- Natural Finish
- Matte Finish
- Molded Finish
Functional Finishes
- CNC Machined Finish
- Precision Ground Finish
- Polished Finish
Specialty Grades
- FDA Food Grade UHMW-PE
- Antistatic UHMW-PE
- Conductive UHMW-PE
- UV-Stabilized UHMW-PE
- Reprocessed UHMW-PE
Frequently Asked Questions (FAQ)
What is UHMW-PE?
UHMW-PE is an ultra-high molecular weight polyethylene known for exceptional wear resistance, impact strength, and low friction.
What is UHMW-PE used for?
Typical applications include:
- Conveyor Systems
- Wear Strips
- Bearings
- Chute Liners
- Medical Implants
Is UHMW-PE better than HDPE?
For wear resistance and impact performance, UHMW-PE significantly outperforms HDPE.
Is UHMW-PE self-lubricating?
Yes. UHMW-PE has an extremely low coefficient of friction and excellent dry-running performance.
Can UHMW-PE be machined?
Yes. UHMW-PE offers excellent CNC machining characteristics.
Why choose UHMW-PE?
Because it combines:
- Outstanding Wear Resistance
- Exceptional Impact Strength
- Extremely Low Friction
- Excellent Chemical Resistance
- Lightweight Construction
Is UHMW-PE food safe?
Yes. FDA-compliant grades are widely used in food processing applications.
Does GCNOV provide UHMW-PE manufacturing services?
Yes. GCNOV provides:
- UHMW-PE CNC Machining
- Custom Wear Components
- Compression Molded Parts
- FDA Food Grade Components
- Prototype Development
- Low-Volume Production
- Mass Production
- Industrial Wear Solutions