XLPE Rotomoulding Powder
What is XLPE Rotomoulding Powder?
XLPE (Cross-Linked Polyethylene) Rotomoulding Powder is a modified form of polyethylene that undergoes a chemical or physical process to create cross-links between polymer chains. These cross-links form a three-dimensional network structure, which significantly improves the material’s physical and chemical properties.
In Rotomoulding, XLPE is used in powder form for ease of melting, uniform distribution inside molds, and even wall thickness during the molding process.
How is XLPE Powder Made?
Base Material
Begins with high-quality linear low-density polyethylene (LLDPE) or low-density polyethylene (LDPE) resins.
Cross-Linking Additives
Special peroxide-based or silane-based additives are introduced to initiate cross-linking during the heating cycle.
Grinding
The resin is ground into fine powder (typically 35 mesh to 100 mesh) to facilitate even melting and molding.
Coloring (Optional)
Pigments or UV stabilizers are added depending on the application.
Key Properties of XLPE Rotomoulding Powder
Thermal Stability
Stress Crack Resistance
Impact Resistance
UV Resistance
Chemical Resistance
Electrical Insulation
Low Water Absorption
Ideal for water tanks and liquid containers
Rotational Molding Process for XLPE
Loading
Heating & Rotation
Cross-Linking Reaction
Cooling
Demolding
Benefits Over Conventional PE
| Feature | Standard PE | XLPE |
|---|---|---|
| Durability | Good | Excellent |
| Heat Distortion Temp. | 90–100°C | 110–120°C |
| Crack Resistance | Moderate | High |
| Environmental Resistance | Moderate | Very High |
| Life Expectancy (Outdoor Use) | 5–7 years | 10+ years |
| Chemical Compatibility | Standard Chemicals | Broad range including aggressive chemicals |
Typical Technical Specifications
| Property | Test Method | Value (Typical) |
|---|---|---|
| Density | ASTM D1505 | 0.935 – 0.940 g/cm³ |
| Melt Flow Index (190°C/2.16kg) | ASTM D1238 | 4.0 – 8.0 g/10 min |
| Tensile Strength @ Yield | ASTM D638 | 18 – 22 MPa |
| Elongation @ Break | ASTM D638 | > 500% |
| Vicat Softening Point | ASTM D1525 | ~115°C |
| Environmental Stress Crack Res. | ASTM D1693 | > 1000 hrs |
| Impact Strength | ASTM D256 | No break |
Availability
XLPE Rotomoulding Powders are available in:
- Natural (unpigmented)
- Black (with carbon black for UV protection)
- Custom Colors (with pigments and UV additives)
Available in 25 kg bags, 500 kg jumbo bags, or bulk loose powder.
Storage & Handling
- Store in cool, dry areas away from direct sunlight.
- Ensure the material is free from contamination before use.
- Use proper ventilation and protective gear during processing to handle fumes generated during cross-linking.
Available Colours
Note: We can also make the custom powder based on your requirements.
Application Industries
FAQs
What is XLPE Rotomoulding Powder?
XLPE Rotomoulding Powder is Cross-Linked Polyethylene in powdered form, specially designed for use in rotational molding processes. It forms a strong, seamless, and durable product with excellent resistance to stress, impact, and environmental conditions.
How is XLPE different from standard polyethylene in Rotomoulding?
Unlike standard polyethylene, XLPE has cross-linked polymer chains that offer superior heat resistance, crack resistance, and durability, especially in applications involving chemicals, stress, or outdoor exposure.
What are the key advantages of using XLPE for Rotomoulding?
- High thermal stability
- Excellent environmental stress crack resistance
- Superior impact strength
- Longer lifespan in outdoor applications
- Chemical and UV resistance
What are the common applications of XLPE Rotomoulding powder?
It is widely used in the manufacturing of water tanks, septic tanks, chemical containers, traffic barriers, marine buoys, and outdoor furniture.
Is XLPE Rotomoulding powder UV resistant?
Yes, especially when formulated with UV stabilizers or carbon black. This makes it ideal for outdoor products exposed to sunlight.
Can XLPE be recycled?
Due to its cross-linked nature, XLPE is not easily recyclable like standard thermoplastics. However, it offers a longer service life, reducing overall environmental impact.
What colors are available in XLPE Rotomoulding powder?
It is available in natural (white), black (UV stabilized), and custom colors upon request.
What is the typical mesh size of XLPE powder for Rotomoulding?
The powder typically ranges from 35 to 100 mesh to ensure smooth melting and even product thickness during molding.
What is the shelf life of XLPE Rotomoulding powder?
When stored in a cool, dry place away from direct sunlight and moisture, XLPE powder has a shelf life of up to 12 months or more.
What are the storage guidelines for XLPE powder?
Store in sealed bags or containers in a dry, shaded area. Avoid exposure to moisture, heat, and contamination to maintain quality.
Is there a difference between peroxide and silane cross-linked XLPE?
Yes. Peroxide-based XLPE cross-links during the molding process, offering more uniform properties, while silane-based systems require post-treatment like moisture curing. Peroxide-based XLPE is more commonly used in Rotomoulding.