Z275 PPGI Prepainted Galvanized Steel Coil with 750–1250mm Width and 25±5μm Top Paint for Structural Roofing and Cladding

1. Product Overview

PPGI coil is used when the project needs both substrate corrosion protection and a finished painted surface. In structural roofing, wall cladding, appliance shells, and light fabricated panels, the galvanized base metal provides the first protective layer, while the paint film improves surface stability and visual consistency.

This specification focuses on 0.20–1.0 mm thickness and 750–1250 mm width, which is suitable for roll forming, cut-to-length production, and panel fabrication. A Z275 option is often selected where a higher zinc coating level is required on the galvanized substrate.

2. Technical Solution

Product performance is based on:

• Hot dipped galvanized steel substrate with Z60–Z275 coating range
• Organic paint layer acting as an additional barrier above the zinc coating
• Top paint thickness of 25±5 μm for visible-side coverage
• Back paint thickness of 7±2 μm for reverse-side protection
• CGCC or DX51D substrate for general roll forming and panel processing
• Soft commercial quality or LFQ for roofing sheet and profile fabrication

For structural roofing and cladding, coating system and zinc coating level should be selected together. The zinc layer mainly affects substrate-side corrosion resistance, while the paint system affects weathering behavior, chalking resistance, and color retention.

3. Specifications

4. Application

• Roofing sheets for steel structure workshops, airports, and warehouses
• Wall cladding and facade panels
• Container-related sheet parts
• Home appliance outer panels
• General building panels and trims
• Roll formed construction 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 when required
• Custom cutting according to downstream designation

6. Advantages

• Z60–Z275 galvanized substrate range supports different corrosion protection requirements
• Top paint thickness of 25±5 μm is suitable for visible architectural panels
• 750–1250 mm width range fits mainstream roofing and cladding production lines
• CGCC and DX51D grades support common forming and panel fabrication
• Soft commercial quality and LFQ options improve processing flexibility
• RAL color customization supports project appearance matching

7. How to Choose

• General roofing and wall panels → polyester is commonly selected
• Projects requiring stronger weather resistance → SMP can be considered
• Higher UV and long-term exterior exposure → PVDF is usually preferred
• Higher substrate corrosion demand → Z180 to Z275 is commonly selected
• Higher rigidity requirement → choose higher thickness within the 0.20–1.0 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 is treated as PPGI because the source gives a zinc coating range of Z60–Z275 rather than an AZ coating range.

Q2: What does Z275 mean for prepainted galvanized steel coil?
It refers to the galvanized substrate coating level. Higher zinc coating levels are generally selected when stronger substrate corrosion resistance is required.

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

Q4: What is the meaning of top 25±5 μm and back 7±2 μm?
It refers to the nominal paint film thickness on the exposed side and reverse side, which affects surface coverage and coating performance.

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