1250mm Prepainted Steel Coil (PPGI / PPGL) to JIS G3312 / ASTM A792 for Roofing,

Product Specification

1250mm Prepainted Steel Coil (PPGI / PPGL) to JIS G3312 / ASTM A792 for Roofing, Construction, and Home Appliance Panels

1. Product Overview

Prepainted steel coil is used where a finished color surface and coated substrate protection are required in the same material. In roofing sheets, wall cladding, appliance housings, and light fabricated panels, the painted surface improves appearance consistency, while the metallic coating on the base steel helps reduce corrosion risk during service.

This product group covers both galvanized-based prepainted steel and galvalume-based prepainted steel. For practical processing, the 700–1250 mm width range and 0.2–1.0 mm thickness range are suitable for cut-to-length production, slitting, roll forming, and profile manufacturing.

2. Technical Solution

Product performance is based on:

• Hot dipped galvanized or galvalume substrate as the base protective layer
• Organic paint coating providing additional barrier protection and decorative finish
• Top paint thickness of 25±5 μm for visible-side coverage
• Back paint thickness of 7±2 μm for reverse-side protection in standard use
• Soft commercial quality or LFQ for roll forming and bending applications

For roofing and cladding production, service performance depends on substrate type, coating level, paint system, and forming condition. Z60–Z275 is typically used for galvanized substrate selection, while AZ30–AZ150 applies to galvalume substrate selection.

3. Specifications

4. Application

• Roofing sheets for steel structure workshops, airports, and storerooms
• Wall cladding and facade panels
• Home appliance outer panels
• Container-related sheet parts
• Light construction and decorative panels
• General roll formed building profiles

5. Processing

• Cut-to-length sheet production
• Slitting into narrow strips
• Roll forming into roofing and wall profiles
• Bending and folding
• Protective film application on the top side when required
• Custom cutting and slitting according to project designation

6. Advantages

• 700–1250 mm width range fits mainstream panel and roll forming lines
• 0.2–1.0 mm thickness range covers common roofing and cladding applications
• Top coating of 25±5 μm is suitable for visible construction surfaces
• PPGI and PPGL options allow substrate selection by project requirement
• CGCC and DX51D grades support common forming and panel processing
• RAL color customization helps match architectural and appliance appearance requirements

7. How to Choose

• General roofing and wall panels → galvanized-based PPGI is commonly selected
• Projects requiring galvalume substrate → PPGL should be specified in advance
• Standard outdoor use → PE is commonly used
• Higher weather resistance requirement → SMP or PVDF is usually preferred
• Higher rigidity requirement → choose thicker sheet within the 0.2–1.0 mm range
• Visible architectural use → confirm color, gloss, paint thickness, and protective film requirement before order

8. FAQ

Q1: Is this product PPGI or PPGL?
This specification covers both. PPGI uses a galvanized steel substrate, while PPGL uses a galvalume steel substrate.

Q2: Why does the specification include both Z and AZ coating ranges?
Because galvanized substrate uses zinc coating, while galvalume substrate uses aluminum-zinc coating. The final order should confirm which base metal is required.

Q3: What does top 25±5 μm and back 7±2 μm mean?
It refers to the nominal paint film thickness on the exposed side and reverse side, which affects surface coverage and coating durability.

Q4: Can this coil be processed into roofing sheets?
Yes. It is commonly used for roll formed roofing sheets, wall cladding profiles, and other construction panels.

Q5: What is LFQ in prepainted steel coil?
LFQ means lock forming quality, which is used when better forming performance is required in profiling and sheet fabrication.