Product Overview
Prepainted Galvanized Steel (PPGI) is produced by coating a hot-dip galvanized steel substrate with a high-performance paint system through a continuous roll-coating process. The base steel provides excellent strength and corrosion resistance (zinc coating range: Z40–Z275 g/m²), while the topcoat delivers aesthetic appeal and additional protection against weathering, chemicals, and UV radiation. Our PPGI coils are manufactured with strict quality control, offering consistent thickness, flatness, and color uniformity. They are widely used in building construction, roofing, wall panels, household appliances, and light industry.
Key Specifications
| Parameter | Range / Options |
|---|---|
| Base Material | Hot-dip galvanized steel (GI) / Galvalume (GL) optional |
| Zinc Coating (double-sided) | Z40 – Z275 g/m² (standard factory coating: Z40 with actual ~25-30 g/m²; higher grades available) |
| Thickness (BMT) | 0.15 mm – 1.2 mm (common: 0.3–0.6 mm for building) |
| Width | 914 mm, 1000 mm, 1200 mm, 1219 mm, 1220 mm, 1250 mm (custom up to 1500 mm) |
| Coil Weight | 3 – 15 MT (standard export packing) |
| Paint System | Top side: Primer + Topcoat (e.g., 5+20 μm) Back side: Backcoat (e.g., 5–10 μm) |
| Paint Types Available | PE (Polyester) – lifespan 3–5 years SMP (Silicon Modified Polyester) – 10–15 years HDP (High Durability Polyester) – 10–12 years PVDF (Polyvinylidene Fluoride) – 20–25 years |
| Color | RAL standard colors (e.g., RAL 9002, RAL 5010, RAL 6005) or custom matching |
| Surface Finish | Regular, embossed, printed, or anti-fingerprint (optional) |
| Coating Hardness | Pass MEK test (≥50 rubs) and T-bend test (0T–3T) per international standards |
Core Advantages
Superior Corrosion Resistance – The zinc layer (Z40–Z275) protects the steel from rust, while the paint film adds a barrier against moisture and chemicals. Salt spray test (SST) performance meets 240–1000 hours depending on coating system.
Excellent Formability – The paint system withstands bending, stamping, and profiling without cracking or peeling (T-bend as low as 0T for thin films).
Long Service Life – Choose PVDF or SMP for up to 20+ years of outdoor durability with minimal fading and chalking.
Aesthetic Versatility – Available in a wide spectrum of RAL colors, gloss levels, and decorative patterns (e.g., wood grain, embossed).
Cost-Effective – Lighter than solid metal sheets, easy to install, and reduces maintenance costs over the building lifecycle.
Applications
Building & Construction: Roofing sheets, wall cladding, ceiling panels, garage doors, shutters.
Industrial: Ventilation ducts, silos, storage tanks, workshops.
Household Appliances: Refrigerator panels, microwave ovens, air conditioner housings.
Agricultural: Poultry houses, greenhouses, livestock shelters.
Automotive & Transportation: Interior trims, trailer panels.
Quality Assurance & Testing
All our PPGI products undergo rigorous inspection per international standards:
MEK Rub Test – to evaluate solvent resistance (≥50 rubs without bare metal).
T‑Bend Test – to measure paint adhesion and flexibility (0T–3T acceptable).
Salt Spray Test (SST) – to confirm corrosion protection (e.g., 240h for PE, up to 1000h for PVDF).
Impact Test – to ensure coating integrity under mechanical stress.
Color Difference (ΔE) – controlled within ≤2.0 for batch consistency.
