PPGI & PPAL Coils – Engineered for Strength, Designed to Last
Product Overview
PPGI (Pre-Painted Galvanized Steel Coil) and PPAL (Pre-Painted Aluzinc Steel Coil) are premium pre-coated steel products manufactured from cold-rolled steel substrate, followed by hot-dip galvanizing or aluzinc coating and continuous roller coating.
They combine the mechanical strength of steel with high-performance organic coatings, offering excellent corrosion resistance, aesthetic flexibility, and formability. These coils are widely used in steel structure buildings, home appliances, agricultural facilities, transport equipment, and cleanroom systems.
Substrate Comparison – GI vs. GL
| Parameter | PPGI | PPAL |
|---|---|---|
| Substrate | Hot-dip galvanized steel (GI) | Hot-dip aluzinc steel (GL – 55%Al, 43.5%Zn, 1.5%Si) |
| Corrosion mechanism | Sacrificial zinc protection | Aluminum oxide barrier + zinc edge protection |
| Red rust resistance | Good for general environments | Excellent (2–4x longer than GI in harsh conditions) |
| Cut edge protection | Very good (zinc sacrificial action) | Moderate (design or coating for cut edge recommended) |
| Heat resistance | Up to ~200°C | Up to ~315°C (Al enhances thermal stability) |
| Typical applications | Standard roofs, walls, ducts, appliance casings | Coastal buildings, agricultural sheds, PV brackets, exhaust ducts |
Technical Specifications
| Parameter | Range |
|---|---|
| Base metal thickness | 0.15 – 1.2 mm (customizable) |
| Effective width | 600 – 1250 mm (up to 1500 mm on request) |
| Coil weight | 3 – 15 tons |
Key Advantages
Superior Weather Resistance
Manufactured on continuous 2-coat-2-bake or 3-coat-3-bake lines. Cross-cut adhesion 0–1 level (ISO 2409). QUV aging >1000h without chalking.
Excellent Formability
High flexibility and adhesion allow 180° bending, reverse impact, deep drawing without coating cracking or peeling.
Aesthetic Versatility
Over 1000 standard colors plus metallic, pearlescent, sandblasted look, wood grain, stone pattern, and printed designs.
Eco-Friendly
Chromium-free passivation (RoHS compliant) and low-VOC coatings available. Supports LEED & BREEAM certification.
Cost-Efficient
Eliminates on-site painting, reduces construction time by >60%, lowers maintenance costs over lifecycle.
Detailed Application Fields
| Industry | Typical Products | Recommended Type |
|---|---|---|
| Industrial construction | Metal roofs, wall panels, cleanroom panels, sandwich panels | PPGI (HDP/PVDF) |
| Residential | Villa roofing tiles, downspouts, roller shutter doors | PPGI (SMP/HDP) |
| Agriculture & livestock | Barn roofs, ventilation domes, grain silo panels | PPAL (PE/HDP) |
| Home appliances | Refrigerator side panels, washing machine casings, microwave housings | PPGI (PE/SMP) |
| Transport | Auto interior panels, van walls, bus shelters, noise barriers | PPGI (HDP/PVDF) |
| Renewable energy | PV mounting brackets, nacelle covers, energy storage cabinets | PPAL (PVDF) |
| Electrical & telecom | Control cabinets, server racks, outdoor distribution boxes | PPAL (HDP/PVDF) |
why choose us
why choose our products
20+ years of coil coating experience, annual capacity >300,000 tons.
Long-term partners with PPG, AkzoNobel, Beckers, etc.
Export to 60+ countries including SE Asia, Middle East, Africa, South America, Europe.
Certifications
Quality Management System Certificate
Certificate of Authorlty to use the official API Monogram
Certificate of Authorlty to use the official API Monogram
Quality Management System Certificate
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