RAL Color Prepainted Galvanized Steel Coil Z60–Z275 in 0.20–1.0mm Thickness for Roofing Sheets and Building Panels

RAL Color Prepainted Galvanized Steel Coil Z60–Z275 in 0.20–1.0mm Thickness for Roofing Sheets and Building Panels

1. Product Overview

Prepainted galvanized steel coil is used for roofing sheets, wall cladding, appliance panels, and other visible building components that require both corrosion protection and a finished colored surface. The product combines a galvanized steel substrate with an organic paint coating, so the steel surface is protected by both the zinc layer and the paint film.

For this specification, the thickness range of 0.20–1.0 mm and width range of 750–1250 mm are suitable for roll forming, cut-to-length production, and panel fabrication. It is commonly selected for metal roofing sheets and light construction panels where appearance consistency and outdoor durability are both important.

2. Technical Solution

Product performance is based on:

• Hot dipped galvanized base metal with Z60–Z275 zinc coating
• Organic paint layer providing additional barrier protection
• Top paint thickness of 25±5 μm for visible surface coverage
• Back paint thickness of 7±2 μm for reverse-side protection
• PE, SMP, or PVDF system selected according to exposure condition
• Soft commercial quality or LFQ for common forming operations

For roofing and wall use, the zinc layer mainly supports base corrosion protection, while the paint system affects weather resistance, chalking behavior, and color retention. In practice, PE is commonly used for standard projects, SMP for higher weather demand, and PVDF for stronger UV and long-term exterior exposure.

3. Specifications

4. Application

• Roofing sheets for workshops, airports, and warehouses
• Wall cladding and facade panels
• Home appliance outer panels
• Container and light enclosure sheet parts
• Roll formed construction profiles
• General decorative and functional building sheets

5. Processing

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

6. Advantages

• Z60–Z275 galvanized substrate supports different corrosion protection levels
• 25±5 μm top coating is suitable for visible construction panels
• 750–1250 mm width range fits mainstream roofing and cladding lines
• CGCC and DX51D grades support common roll forming and panel processing
• RAL color customization helps match project appearance requirements
• Applicable to both construction panels and appliance-related sheet fabrication

7. How to Choose

• General roofing and wall panels → PE is commonly selected
• Projects requiring better weather resistance → SMP is often preferred
• Long-term exterior exposure and stronger UV resistance → PVDF is usually selected
• Higher rigidity requirement → choose thicker sheet within the 0.20–1.0 mm range
• Visible architectural panels → confirm color, gloss, top paint thickness, and protective film requirement before order

8. FAQ

Q1: Is this product PPGI or bare GI coil?
This specification is PPGI, which uses a galvanized steel substrate plus an organic paint coating.

Q2: What does Z60–Z275 mean?
It refers to the zinc coating level on the galvanized base metal. Higher coating levels are generally selected when stronger corrosion resistance is required.

Q3: Can this coil be processed into roofing sheets?
Yes. It is commonly roll formed into corrugated roofing sheets and wall cladding profiles.

Q4: Why is the top paint thickness 25±5 μm important?
It affects visible surface coverage, color consistency, and outdoor weathering performance.

Q5: What is the difference between PE, SMP, and PVDF?
They are different paint systems. PE is used for standard projects, SMP for improved weather performance, and PVDF for stronger UV resistance and long-term exterior durability.