JIS G3312 DX51D+Z Prepainted Color Steel Coils with Z60–Z275 Zinc Coating for

Product Specification

JIS G3312 DX51D+Z Prepainted Color Steel Coils with Z60–Z275 Zinc Coating for Roofing and Building Panels

1.Product Overview

Prepainted color steel coils are designed for roofing sheets, wall cladding, appliance panels, and light building components that require both corrosion protection and a finished decorative surface. The product uses a galvanized steel substrate and an organic paint system, so the steel surface is protected by both the zinc layer and the paint film.

For roofing and construction use, the key practical factors are substrate quality, zinc coating level, paint system, and paint film thickness. These parameters affect forming performance, outdoor durability, and appearance stability after installation.

2.Technical Solution

Product performance is based on:

• Hot dipped galvanized substrate with controlled zinc coating mass
• Polyester, SMP, or PVDF finish selected according to service condition
• Top coating of 10–20 micron polyester plus 5 micron primer
• Back coating of 5–7 micron, or 7–8 micron polyester plus 5 micron primer
• Commercial quality or LFQ substrate for roll forming and bending
• Optional protective film for visible-side handling protection

For building panels, the zinc layer mainly supports substrate corrosion resistance, while the paint layer controls surface weatherability, color retention, and visual uniformity. Higher coating selection is typically matched to stronger outdoor exposure.

3.Specifications

4.Application

• Construction roofing sheets
• Wall cladding and facade panels
• Steel structure workshop panels
• Airport and warehouse enclosure sheets
• Home appliance outer panels
• Container-related sheet parts

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

• 0.12–1.20 mm thickness range suits mainstream color-coated sheet processing
• 700–1250 mm width range fits common roofing and cladding lines
• 20–275 g/m² zinc coating range allows different substrate protection levels
• Multiple paint systems support different weathering requirements
• Top and back paint structure is suitable for visible construction panels
• 508 mm and 610 mm coil IDs match standard decoiling equipment

7.How to Choose

• General roofing and wall panels → polyester is commonly selected
• Projects requiring better weather resistance → SMP is often preferred
• Higher UV and long-term exterior exposure → PVDF is usually selected
• Higher substrate corrosion requirement → select higher zinc coating within the available range
• Visible architectural panels → confirm color, gloss, paint structure, and protective film requirement before order
• More demanding forming operations → LFQ can be considered

8.FAQ

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

Q2: What is the difference between polyester, SMP, and PVDF?
They are different paint systems. Polyester is common for standard applications, SMP is used for improved weather resistance, and PVDF is generally selected for higher UV resistance and longer exterior service.

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

Q4: What does LFQ mean?
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 with protective film?
Yes. The top side can be supplied with or without protective film according to order requirement.