DX51D Prepainted Galvanized Steel Coil with 25±5μm Top Coating and 700–1250mm Width for Roofing, Construction, and Home Appliance Panels

1. Product Overview

DX51D prepainted galvanized steel coil is used in roofing sheets, wall cladding, home appliance panels, and light fabricated construction parts where both corrosion protection and finished appearance are required. The product combines a galvanized steel substrate with an organic paint coating, so it can provide base metal protection together with a stable color surface.

For this type of material, the main technical points are substrate grade, zinc coating level, paint system, and paint thickness. These factors directly affect forming performance, surface durability, and outdoor service stability.

2. Technical Solution

Product performance is based on:

• Galvanized steel substrate providing base corrosion protection
• Organic top coating acting as an additional barrier layer
• DX51D or CGCC grade supporting roll forming and general panel fabrication
• Top coat thickness of 25±5 μm for visible surface coverage
• Back coat thickness of 7±2 μm for reverse-side protection in standard applications

For roofing and wall panel use, the paint system should be matched to environment. PE is commonly used for standard projects, SMP is used when stronger weather resistance is needed, and PVDF is selected where UV resistance and long-term color retention are more important.

3. Specifications

4. Application

• Roofing sheets and roof accessories
• Wall cladding and facade panels
• Home appliance outer panels
• Light construction panels and trims
• Cut sheets for corrugated profile production
• General prepainted building sheet fabrication

5. Processing

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

6. Advantages

• DX51D and CGCC substrate grades support common roll forming operations
• Top coating of 25±5 μm is suitable for visible construction panels
• Width range of 700–1250 mm fits mainstream sheet and panel lines
• Z60–Z275 substrate coating range supports different service environments
• RAL color customization helps match project appearance requirements
• 508 mm and 610 mm coil IDs are compatible with common decoiling equipment

7. How to Choose

• General roofing and wall panels → PE is commonly selected
• Projects requiring better outdoor durability → SMP can be considered
• Higher UV exposure and long-term color retention requirement → PVDF is usually preferred
• Thicker or more rigid panels → select higher thickness within the 0.2–1.0 mm range
• Visible architectural panels → confirm color, gloss, paint thickness, and whether protective film is needed before production

8. FAQ

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

Q2: What is the meaning of 25±5 μm top coating?
It refers to the nominal top paint film thickness on the exposed side, which affects surface coverage and weathering performance.

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

Q4: What is the difference between PE, SMP, and PVDF?
They are different paint systems. PE is common for standard projects, SMP offers stronger weather resistance, and PVDF is generally selected for higher UV and long-term exterior exposure.

Q5: What coil size is suitable for standard processing lines?
Coil IDs of 508 mm and 610 mm and coil weights of 3–8 MT are commonly used in industrial decoiling and roll forming lines.