Overview
HDPE (High-Density Polyethylene) is a versatile engineering and industrial thermoplastic known for its exceptional chemical resistance, impact strength, moisture resistance, durability, lightweight properties, and cost-effectiveness.
Compared with other polyethylene grades, HDPE offers higher density, improved stiffness, greater tensile strength, and enhanced structural performance while maintaining excellent corrosion resistance and toughness.
HDPE is widely used in:
- Chemical Storage Tanks
- Industrial Components
- Water and Gas Piping Systems
- Food Processing Equipment
- Marine Applications
- Cutting Boards
- Electrical Insulation
- Wear-Resistant Parts
Due to its excellent balance of performance and affordability, HDPE is one of the most widely used plastics in industrial, commercial, and consumer applications worldwide.
Material Specification
| Property | Value |
|---|---|
| Material Designation | HDPE |
| Full Name | High-Density Polyethylene |
| Material Family | Polyethylene Thermoplastic |
| Density | 0.94–0.97 g/cm³ |
| Appearance | Natural, White, Black, Colored |
| Typical Manufacturing Methods | Extrusion, Injection Molding, Blow Molding, CNC Machining |
| Standard Forms | Sheet, Rod, Tube, Film, Pellets |
Chemical Composition
HDPE consists of linear polyethylene chains with minimal branching, resulting in higher crystallinity and density.
| Component | Function |
|---|---|
| High-Density Polyethylene Polymer | Structural Matrix |
| UV Stabilizers (Optional) | Outdoor Durability |
| Antioxidants | Thermal Stability |
| Colorants | Appearance Enhancement |
Mechanical Properties
Typical Values
| Property | Value |
|---|---|
| Tensile Strength | 25–37 MPa |
| Yield Strength | 22–32 MPa |
| Elongation at Break | 200–1000% |
| Flexural Strength | 25–45 MPa |
| Flexural Modulus | 0.8–1.5 GPa |
| Hardness | Shore D 60–70 |
| Impact Strength | Excellent |
Typical Mechanical Performance
| Property | Performance |
|---|---|
| Toughness | Excellent |
| Impact Resistance | Excellent |
| Fatigue Resistance | Excellent |
| Crack Resistance | Excellent |
HDPE maintains excellent toughness even under low-temperature conditions.
Physical Properties
| Property | Value |
|---|---|
| Density | 0.94–0.97 g/cm³ |
| Water Absorption | <0.01% |
| Thermal Conductivity | 0.40–0.52 W/m·K |
| Electrical Resistivity | >10¹⁵ Ω·cm |
| Specific Heat Capacity | 2200 J/kg·K |
HDPE offers one of the lowest moisture absorption rates among thermoplastics.
Thermal Properties
| Property | Value |
|---|---|
| Melting Point | 130–137°C |
| Heat Deflection Temperature | 65–85°C |
| Continuous Service Temperature | -100°C to 80°C |
| Short-Term Service Temperature | Up to 110°C |
HDPE provides excellent low-temperature performance and moderate heat resistance.
Strength-to-Weight Ratio
| Material | Density (g/cm³) | Tensile Strength |
|---|---|---|
| HDPE | 0.95 | 30 MPa |
| PP | 0.90 | 35 MPa |
| POM | 1.42 | 70 MPa |
| Aluminum 6061 | 2.70 | 310 MPa |
HDPE offers excellent lightweight performance for structural and industrial applications.
Chemical Resistance
| Chemical Environment | Performance |
|---|---|
| Water | Excellent |
| Acids | Excellent |
| Alkalis | Excellent |
| Salt Solutions | Excellent |
| Alcohols | Excellent |
| Oils & Greases | Excellent |
| Hydrocarbons | Good |
| Strong Oxidizers | Fair |
HDPE is one of the most chemically resistant plastics available for industrial use.
Moisture & Weather Resistance
| Property | Performance |
|---|---|
| Water Absorption | Outstanding |
| Humidity Resistance | Outstanding |
| Corrosion Resistance | Outstanding |
| Outdoor Durability | Good |
UV-stabilized grades are recommended for prolonged outdoor exposure.
Electrical Properties
| Property | Value |
|---|---|
| Volume Resistivity | >10¹⁵ Ω·cm |
| Surface Resistivity | >10¹⁴ Ω |
| Dielectric Strength | 20–50 kV/mm |
| Dielectric Constant | 2.3–2.4 |
HDPE is widely used as an insulating material in electrical and telecommunications industries.
Wear Resistance
| Property | Performance |
|---|---|
| Abrasion Resistance | Good |
| Sliding Wear Resistance | Good |
| Surface Durability | Good |
| Friction Coefficient | Low |
While not as wear-resistant as UHMW-PE, HDPE performs well in many industrial wear applications.
Impact Resistance
| Property | Rating |
|---|---|
| Room Temperature Impact | Excellent |
| Low Temperature Impact | Outstanding |
| Drop Resistance | Excellent |
| Crack Resistance | Excellent |
HDPE maintains toughness even in freezing environments.
Machinability
| Process | Rating |
|---|---|
| CNC Milling | Excellent |
| CNC Turning | Excellent |
| Drilling | Excellent |
| Routing | Excellent |
| Plastic Welding | Excellent |
Machinability Comparison
| Material | Machinability |
|---|---|
| HDPE | Excellent |
| UHMW-PE | Excellent |
| PP | Excellent |
| POM | Outstanding |
HDPE is easy to machine and fabricate into custom industrial components.
Injection Molding Characteristics
| Property | Rating |
|---|---|
| Moldability | Excellent |
| Flow Characteristics | Excellent |
| Production Efficiency | Excellent |
| Surface Finish | Good |
| Shrinkage Control | Moderate |
HDPE is one of the most widely injection-molded plastics globally.
International Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ISO | HDPE |
| ASTM | High-Density Polyethylene |
| DIN | PE-HD |
| JIS | HDPE |
| GB/T (China) | 高密度聚乙烯（HDPE） |
| UL | HDPE Thermoplastic |
Available Forms
| Product Type | Availability |
|---|---|
| Sheet | Yes |
| Rod | Yes |
| Tube | Yes |
| Film | Yes |
| Pellets | Yes |
| Injection Molded Parts | Yes |
Typical Applications
Chemical Industry
- Chemical Storage Tanks
- Acid Containers
- Process Equipment
- Fluid Handling Systems
Water & Gas Infrastructure
- Water Pipes
- Gas Distribution Pipes
- Fittings
- Underground Utility Systems
Food Processing
- Cutting Boards
- Food Contact Components
- Conveyor Parts
- Storage Containers
Marine Industry
- Dock Components
- Marine Wear Pads
- Boat Accessories
- Corrosion-Resistant Parts
Electrical Industry
- Cable Protection
- Electrical Insulation
- Utility Components
Industrial Equipment
- Wear Strips
- Guide Rails
- Machine Guards
- Structural Panels
Manufacturing Characteristics
| Manufacturing Process | Rating |
|---|---|
| Extrusion | Outstanding |
| Blow Molding | Outstanding |
| Injection Molding | Outstanding |
| CNC Machining | Excellent |
| Welding | Excellent |
Advantages
Excellent Chemical Resistance
Suitable for highly corrosive environments.
Outstanding Moisture Resistance
Virtually no water absorption.
High Impact Strength
Maintains toughness at low temperatures.
Lightweight
Lower density than most engineering plastics.
Excellent Electrical Insulation
Widely used in electrical applications.
Cost Effective
One of the most economical industrial plastics available.
Limitations
Lower Stiffness
Less rigid than POM, Nylon, or Polycarbonate.
Limited Heat Resistance
Not recommended for continuous high-temperature environments.
UV Sensitivity
Standard grades may degrade under prolonged UV exposure.
Surface Softness
More prone to scratching than harder engineering plastics.
Comparison with Common Plastics
| Property | HDPE | PP | POM | PA66 |
|---|---|---|---|---|
| Chemical Resistance | Excellent | Excellent | Good | Good |
| Moisture Resistance | Outstanding | Outstanding | Excellent | Moderate |
| Impact Resistance | Excellent | Good | Good | Excellent |
| Wear Resistance | Good | Good | Excellent | Excellent |
| Cost | Low | Low | Higher | Higher |
Comparison with UHMW-PE
| Property | HDPE | UHMW-PE |
|---|---|---|
| Strength | Good | Better |
| Wear Resistance | Good | Outstanding |
| Impact Resistance | Excellent | Outstanding |
| Cost | Lower | Higher |
| Machinability | Excellent | Excellent |
Available Surface Finishes
Standard Finishes
- Natural Finish
- Matte Finish
- Textured Finish
Functional Finishes
- CNC Machined Finish
- Extruded Finish
- Molded Finish
Specialty Grades
- UV-Stabilized HDPE
- FDA Food Grade HDPE
- Conductive HDPE
- Antistatic HDPE
- Marine Grade HDPE
Frequently Asked Questions (FAQ)
What is HDPE?
HDPE (High-Density Polyethylene) is a durable thermoplastic known for excellent chemical resistance, impact strength, and moisture resistance.
What is HDPE used for?
Typical applications include:
- Water Pipes
- Chemical Tanks
- Food Processing Equipment
- Industrial Components
- Marine Applications
Is HDPE chemically resistant?
Yes. HDPE offers outstanding resistance to acids, alkalis, water, and many industrial chemicals.
Is HDPE food safe?
Yes. FDA-compliant grades are widely used in food processing and packaging applications.
Can HDPE be machined?
Yes. HDPE offers excellent CNC machining and fabrication performance.
Why choose HDPE?
Because it combines:
- Excellent Chemical Resistance
- Outstanding Moisture Resistance
- High Impact Strength
- Lightweight Construction
- Cost-Effective Performance
What is the difference between HDPE and UHMW-PE?
UHMW-PE provides superior wear resistance and impact strength, while HDPE offers lower cost and easier processing.
Does GCNOV provide HDPE manufacturing services?
Yes. GCNOV provides:
- HDPE CNC Machining
- HDPE Fabrication
- Injection Molding
- Blow Molding
- Plastic Welding
- Prototype Development
- Low-Volume Production
- Mass Production