Our HDPE Injection Molding Capabilities
Whether you need chemical-resistant industrial parts or food-grade packaging, our HDPE injection molding service delivers reliable performance with fast turnaround.
Product Design Support
- DFM expertise for HDPE’s shrinkage and flow behavior
- Design optimization for impact resistance and weight reduction
- Compliance with food-grade and regulatory standards
Mold Design & Manufacturing
- Precision tooling for high-volume HDPE production
- Optimized gating to avoid sink marks and warpage
- Texturing and surface finishes to match functional needs
Plastic Injection Molding
- Processing HDPE for thin-wall or thick-wall components
- High-speed production cycles for efficiency
- Specialized mold cooling to maintain dimensional stability
Post-processing & Assembly
- CNC finishing for precision features
- Surface treatment to improve printability and adhesion
- Assembly with other materials for complex products
What is HDPE – High-Density Polyethylene
High-Density Polyethylene (HDPE) is a lightweight, durable, and chemically resistant thermoplastic widely used in packaging, piping, containers, and automotive components. It offers excellent toughness, low moisture absorption, and good dimensional stability. HDPE can be processed through injection molding, blow molding, or CNC machining. Proper temperature control and mold design are important to minimize shrinkage and warping, especially in thicker sections.
| Property | Typical Value / Description | Notes |
|---|---|---|
| Tensile Strength | 25–35 MPa | Moderate strength; suitable for light to medium load applications |
| Flexural Strength | 40–60 MPa | Provides sufficient rigidity for most structural parts |
| Impact Strength (Notched/Unnotched) | 50–100 J/m | Good toughness; absorbs shocks without cracking |
| Elastic Modulus | 0.8–1.5 GPa | Relatively flexible compared to engineering plastics |
| Heat Deflection Temperature | 75–120°C | HDPE can tolerate moderate temperatures; prolonged exposure may cause deformation |
| Density | 0.94–0.97 g/cm³ | Lightweight, easy to handle |
| Chemical Resistance | Excellent; resistant to most acids, bases, and solvents | Suitable for chemical exposure environments |
| Water Absorption | <0.01% | Minimal; maintains dimensional stability |
| Shrinkage | 1.5–2.5% | Must be considered in mold design, especially for thick or complex parts |
| Flammability | UL94 HB | Basic flame resistance; can be enhanced with additives |
Common Applications of HDPE Molded Parts
| Industry | Example Parts | Why HDPE Works Well |
|---|---|---|
| Packaging | Caps, containers, beverage crates | Food-safe, moisture barrier, cost-effective |
| Automotive | Fuel tanks, splash guards, battery cases | Impact resistant, chemical stability |
| Industrial | Pipe fittings, protective housings | Corrosion-resistant, durable |
| Agriculture | Irrigation components, fertilizer containers | UV-stabilized options, lightweight |
Production & Delivery Solutions
| Solution Type | Best For | Typical Lead Time | Notes |
|---|---|---|---|
| Rapid Prototyping | Functional testing of HDPE designs | 7–10 days | Suitable for pilot runs |
| Small Batch | Limited-run HDPE components | 2–3 weeks | Flexible grade selection |
| Mass Production | High-volume industrial/consumer parts | 4–6 weeks | Cost-effective, consistent quality |
| Export Molds | Overseas HDPE molding | 5–7 weeks | Long mold life for continuous production |
HDPE Injection Molding FAQs
HDPE is denser, stronger, and more rigid, while LDPE is softer and more flexible. HDPE is preferred for load-bearing or structural applications.
Yes, many HDPE grades are FDA-approved for direct food contact.
Standard HDPE may degrade under UV exposure, but UV-stabilized grades are available for outdoor use.
Yes, HDPE is one of the most widely recycled plastics, labeled as recycling code #2.
Like other polyethylenes, HDPE has low surface energy, making painting/gluing difficult without surface treatment.
