What is HDPE Coating?
HDPE Coating, orHigh-Density Polyethylene Coating, is a protective layer primarily composed of high-density polyethylene resin, supplemented with additives such as antioxidants, light stabilizers, lubricants, and pigments.
This coating is applied to aluminum sheets through specialized processes to enhance corrosion resistance, wear resistance, and weather resistance, making it ideal for architectural cladding.
Key Components
- High-Density Polyethylene (HDPE) Resin: The primary material providing structural integrity and durability.
- Antioxidants: Prevent oxidative degradation during processing and service life.
- Light Stabilizers: Protect against UV radiation to maintain color and mechanical properties.
- Lubricants: Improve processing efficiency and surface finish.
- Pigments: Offer color customization based on Pantone or RAL color systems.
Structure
HDPE-coated aluminum typically adopts the following configurations:
- Two-Layer Coating: HDPE + Epoxy Resin
- Three-Layer Coating: HDPE + Cushion (Adhesive Layer) + Epoxy Resin
- Single-Layer Coating: Pure HDPE
Worthwill's HDPE Painted Aluminum Specifications
| Parameter | Details |
| Alloy | 1060, 3003, 3004, 3005, 3105, 5005, 5052, etc. |
| Temper | H12, H14, H16, H18, H22, H24, H26, H42, H44, etc. |
| Thickness | 0.1 mm – 6.0 mm (roll) or customized |
| Width | 30 mm – 2,200 mm |
| Primer Thickness | 5–10 μm |
| Coating Thickness | 20–50 μm |
| Colors | Black, white, blue, yellow, red, green, or custom (Pantone/RAL) |
| Production Process | Roller Coating Process |
Production Workflow
Worthwill utilizes advanced coating lines for efficient manufacturing:
- Pre-Treatment: Degreasing, rinsing, and passivation to remove surface contaminants and enhance adhesion.
-
Coating:
- Primer Application: Roller-coated and cured.
- Topcoat Application: HDPE layer applied and cured at200°C–300°C.
- Curing: Oven curing ensures complete polymerization of the coating.
- Post-Processing: Slitting, embossing, laminating, etc., based on requirements.
Quality Control
| Test Item | Standard (GB/T-17748-2016) | Result |
|---|---|---|
| Color Difference | ΔE ≤ 2.0 | ΔE ≤ 1.0 |
| Coating Thickness | ≥23 μm (2-layer) / ≥30 μm (3-layer) | ≥25 μm / ≥34 μm |
| Adhesion | Grade 0 | Grade 0 |
| Salt Spray Resistance | 4,000 hrs, ≤Grade 1 | No change |
| Color Retention | ΔE ≤ 4.0 after 4,000 hrs | ΔE ≤ 3.0 |
Properties
- Mechanical Strength: High rigidity and impact resistance.
- Chemical Resistance: Excellent resistance to acids, alkalis, and salts.
- Electrical Insulation: Superior dielectric properties.
- Weather Resistance: UV stability for long-term outdoor use.
- Low-Temperature Performance: Maintains flexibility in cold environments.
- Eco-Friendly: Non-toxic and recyclable.
HDPE Coating vs. PVDF Coating
| Property | HDPE-Coated Aluminum | PVDF-Coated Aluminum |
| Weather Resistance | Excellent UV resistance | Superior, best-in-class |
| Color Retention | Good | Exceptional |
| Corrosion Resistance | Resists acids, alkalis | Superior in harsh environments |
| Coating Thickness | 20–50 μm | 25–50+ μm |
| Hardness & Wear Resistance | Moderate | High |
| Cost | Cost-effective | Higher price |
| Applications | General construction, roofing | High-end architecture, airports, stadiums |
Applications
-
Construction:
- Curtain walls.
- roofing systems.
- exterior decoration.
- doors/windows.
-
Consumer Electronics:
- Refrigerator shells.
- washing machine panels.
- AC casings.
-
Transportation:
- Automotive.
- Shipbuilding.
- aircraft components.
-
Chemical Industry:
- Lining for tanks.
- pipelines.
Why choose us?
Worthwill is equipped withmultiple color coating production lines, including:
- 4 two-coat-two-bake lines,
- 2 three-coat-three-bake lines,
-
Over 300 sets of auxiliary automated equipment,
enabling us to select the optimal production line tailored to your specific requirements.
By choosing Worthwill's HDPE-coated aluminum, you benefit fromfaster delivery,competitive pricing, andpremium quality tailored to diverse industrial needs.
