700–1250mm PPGI / PPGL Prepainted Steel Coil with 25±5μm Top Coating for Roofing, Construction, and Home Appliance Panels

1. Product Overview

Prepainted steel coil is used for roofing sheets, wall panels, appliance outer shells, and other formed sheet products that require both a decorative finish and basic corrosion protection. Compared with unpainted metallic sheet, the prepainted system combines substrate protection with a finished color surface, which reduces secondary painting work in downstream fabrication.

This product group includes both PPGI and PPGL options. PPGI uses a galvanized steel substrate, while PPGL uses a galvalume substrate. For projects covering 700–1250 mm width and 0.2–1.0 mm thickness, the material is suitable for roll forming, cut-to-length processing, and light panel fabrication.

2. Technical Solution

Product performance is based on:

• Galvanized or galvalume base metal for substrate corrosion protection
• Organic paint layer providing an additional surface barrier
• Top coat thickness of 25±5 μm for visible surface coverage
• Back coat thickness of 7±2 μm for standard reverse-side protection
• Soft commercial quality or LFQ for common profiling and bending operations

In practice, coating type and substrate type should be selected according to service environment. PPGI is commonly used for general roofing and panel applications, while PPGL is often considered where higher heat reflectivity or different atmospheric corrosion behavior is required. Paint system selection also affects weather resistance and color durability.

3. Specifications

4. Application

• Roofing sheets for workshops, airports, and warehouses
• Wall cladding and facade panels
• Home appliance outer panels
• Container-related sheet parts
• Light construction panels and trims
• General decorative and functional building sheets

5. Processing

• Cut-to-length sheet production
• Slitting into narrower strips
• Roll forming into roofing and wall profiles
• Bending and folding
• Custom cutting according to project size
• Protective film application when required

6. Advantages

• 700–1250 mm width range fits mainstream roofing and cladding production lines
• 0.2–1.0 mm thickness range covers light to medium formed sheet applications
• Top coating of 25±5 μm is suitable for visible construction panels
• PPGI and PPGL options allow substrate selection by project environment
• CGCC and DX51D grades support common roll forming requirements
• RAL color customization supports project-based appearance control

7. How to Choose

• General roofing and wall panels → PPGI is commonly selected
• Projects requiring different substrate behavior or reflective performance → PPGL can be considered
• Standard outdoor use → PE is commonly used
• Higher weather resistance requirement → SMP or PVDF is usually preferred
• More rigid panel requirement → choose higher thickness 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: What is the difference between PPGI and PPGL?
PPGI uses a galvanized steel substrate, while PPGL uses a galvalume substrate. The choice depends on the service environment, project requirement, and substrate preference.

Q2: Is this product suitable for roofing sheet production?
Yes. It is commonly used for roll formed roofing sheets and wall cladding panels.

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

Q4: What is LFQ in prepainted steel coil?
LFQ means lock forming quality, which is used when better forming performance is needed in profiling and sheet fabrication.

Q5: Can the coil be supplied in customized colors?
Yes. Colors can be produced according to the RAL color card or customer-approved samples.