High-pressure polyethylene
High-pressure polyethylene (HPPE) is a versatile polymer widely used in various industrial applications due to its excellent chemical resistance, durability, and flexibility. Manufactured under high-pressure conditions, this type of polyethylene offers superior performance in packaging, pipes, and film applications. Below, we provide a detailed overview of High-pressure polyethylene, including its key properties, technical specifications, and answers to frequently asked questions.
Product Parameters
Key Features:
- High chemical resistance
- Excellent impact strength
- Superior flexibility at low temperatures
- High transparency (for film-grade variants)
- Good processability
Technical Specifications:
| Property | Value | Test Method |
|---|---|---|
| Density | 0.915 - 0.925 g/cm³ | ISO 1183 |
| Melt Flow Index (190°C/2.16 kg) | 0.2 - 50 g/10 min | ISO 1133 |
| Tensile Strength at Yield | 8 - 12 MPa | ISO 527 |
| Elongation at Break | 600 - 800% | ISO 527 |
| Vicat Softening Temperature | 85 - 95°C | ISO 306 |
Applications
High-pressure polyethylene is suitable for various applications including:
- Packaging films (food, industrial, agricultural)
- Blow molding containers
- Pipes and fittings
- Coatings and laminates
- Wire and cable insulation
FAQ Section
What is the main difference between High-pressure polyethylene and Low-density polyethylene (LDPE)?
While both are chemically similar, High-pressure polyethylene is produced under significantly higher pressures (up to 300 MPa) compared to LDPE. This results in a polymer with slightly higher density, improved mechanical properties, and better resistance to environmental stress cracking.
Can High-pressure polyethylene be recycled?
Yes, High-pressure polyethylene is 100% recyclable. It falls under resin identification code #4 (LDPE) and can be reprocessed into new products like plastic lumber, compost bins, and floor tiles. However, proper sorting from other plastics is essential for effective recycling.
What temperature range can High-pressure polyethylene withstand?
High-pressure polyethylene typically operates effectively between -50°C to 80°C. Some specially formulated grades can withstand short-term exposure up to 100°C. For continuous high-temperature applications above 60°C, cross-linked polyethylene (PEX) is recommended.
Processing Guidelines
For optimal results when working with High-pressure polyethylene, consider these processing parameters:
| Process | Temperature Range | Notes |
|---|---|---|
| Injection Molding | 160-260°C | Use adequate cooling time |
| Blow Molding | 150-230°C | Higher melt index grades preferred |
| Extrusion | 170-250°C | Adjust screw speed for film thickness |
| Thermoforming | 120-180°C | Pre-drying not usually required |
Quality Standards
Our High-pressure polyethylene complies with international standards including:
- FDA 21 CFR for food contact applications
- EU Regulation 10/2011 for food safety
- ISO 9001 quality management system
- RoHS and REACH compliance for environmental safety
Storage Recommendations
To maintain the quality of High-pressure polyethylene:
- Store in a dry, cool environment (below 40°C)
- Keep away from direct sunlight and heat sources
- Use within 12 months of manufacturing for optimal properties
- Keep packaging sealed until ready for use
Additional Technical Support
For specific application requirements or technical queries regarding High-pressure polyethylene, our engineering team can provide customized solutions including:
- Material selection assistance
- Processing parameter optimization
- Product testing and validation
- Troubleshooting support