1250mm SGCC Blue RAL Prepainted Galvanized Steel Coil (PPGI) for Roofing Sheet with 20–275 g/m² Zinc Coating

1. Product Overview

PPGI steel coil combines a galvanized steel substrate with an organic coating system to provide both corrosion protection and decorative surface performance. It is widely used in roofing sheet production, where both durability and color consistency are required.

This specification focuses on widths up to 1250 mm and thickness from 0.12–1.20 mm, which matches mainstream roll forming and roofing panel manufacturing lines. Blue RAL color is commonly used in industrial buildings and prefabricated structures.

2. Technical Solution

The performance of this product is based on a dual-layer protection system:

• Galvanized substrate with zinc coating 20–275 g/m²

• Organic coating system (primer + top paint)

• Top coating structure: 10–20 μm polyester + 5 μm primer

• Back coating: 5–7 μm or 7–8 μm system

• Surface treatment options including chromated, oiled, or anti-fingerprint

The zinc layer provides base corrosion resistance, while the paint system improves weather resistance, color retention, and surface stability.

3. Specifications

4. Application

• Roofing sheets for steel structure workshops and warehouses
• Wall cladding and facade panels
• Prefabricated building panels
• Home appliance outer casings
• Container panel components
• General construction sheet forming

5. Processing

• Cut-to-length sheet production
• Slitting into narrow coils
• Roll forming into roofing profiles
• Bending and folding
• Surface protection film application
• Custom size cutting based on project requirements

6. Advantages

• Zinc coating range 20–275 g/m² supports different corrosion environments
• Standardized coating system ensures stable surface performance
• 1250 mm width matches mainstream roofing production lines
• Multiple coating systems (PE / SMP / PVDF) for different weather conditions
• Surface treatment options improve handling and storage performance
• RAL color system supports architectural design matching

7. How to Choose

• Standard roofing → Polyester coating is widely used
• Moderate outdoor durability → SMP coating
• Long-term exposure and UV resistance → PVDF coating
• Higher corrosion requirement → ≥ Z120 or Z180 recommended
• Roof panel forming → LFQ recommended
• Appearance-focused projects → confirm color, gloss, and coating system

8. FAQ

Q1: Is this PPGI or PPGL?
This specification follows galvanized substrate parameters (20–275 g/m²), so it is classified as PPGI.

Q2: What does 20–275 g/m² zinc coating mean?
It indicates the total zinc coating weight on both sides of the steel, affecting corrosion resistance.

Q3: Can this be used for roofing sheets?
Yes, it is specifically designed for roll forming into roofing and wall panels.

Q4: What is the coating structure of the paint system?
Top coating is polyester with primer, while the back side uses a thinner protective layer.

Q5: What is LFQ?
LFQ (Lock Forming Quality) ensures better forming performance during bending and roll forming.