JIS G3312 DX51D+Z Prepainted Color Steel Coils 0.12–1.20mm 700–1250mm for Roofing and Building Panels

JIS G3312 DX51D+Z Prepainted Color Steel Coils 0.12–1.20mm 700–1250mm for Roofing and Building Panels

1．Product Overview

This product should be defined as prepainted galvanized steel coil based on your latest master specification document for 彩涂卷, not as a mixed galvanized/galvalume page. The governing standards in the document are JIS G3312/94, GB/T 12754, and EN 10169 DX51D+Z, with commercial quality or lock forming quality LFQ.

It is suitable for roofing sheets, wall cladding, appliance panels, and other formed sheet applications where both substrate protection and finished surface appearance are required. The galvanized coating protects the base steel, while the paint system improves weatherability and color consistency in service.

2．Technical Solution

The product uses a galvanized steel substrate with a zinc coating range of 20–275g/m2. On the painted side, the top surface is defined as 10–20 micron polyester plus 5 micron primer. The back surface is 5–7 micron, or 7–8 micron polyester plus 5 micron primer. Available paint categories are polyester, SMP, and PVDF.

In practical outdoor use, the zinc layer mainly affects base corrosion protection, while the paint system controls surface weathering, chalking behavior, and color retention. Polyester is commonly used for standard projects, SMP for stronger exposure, and PVDF for longer exterior service and higher UV resistance. This is why coating choice should be matched to application environment instead of only color selection.

3．Specifications

4．Application

This material is suitable for roofing sheets and wall cladding in workshops, warehouses, airports, and storerooms. It is also suitable for home appliance panels and other visible sheet parts where a decorative surface and stable substrate protection are both required.

Because the product is defined as commercial quality or LFQ, it is suitable for common roll forming, bending, and panel fabrication rather than only flat decorative sheet supply.

5．Processing

• The coil can be supplied for cut-to-length production according to final sheet size requirements.
• It can be slit into narrower widths for downstream profiling and panel production.
• It is suitable for roll forming into roofing sheets and wall cladding profiles.
• Protective film can be supplied on the top side when required.
• With coil ID of 508mm or 610mm and coil weight up to 13 MT, it matches mainstream decoiling and roll-forming equipment.

6．Advantages

• The product uses a galvanized substrate with a clearly defined zinc coating range of 20–275g/m2.
• The thickness range of 0.12–1.20mm covers mainstream prepainted sheet processing.
• The width range of 700–1250mm matches common roofing and cladding production lines.
• The top and back coating structure is clearly defined for visible-side and reverse-side performance.
• Polyester, SMP, and PVDF options allow coating selection according to weather exposure and service target.
• 508mm / 610mm coil ID and max. 13 MT coil weight fit standard processing routes.

7．How to Choose

• Choose polyester for standard indoor or mild outdoor roofing and wall applications.
• Choose SMP when the project requires better weather resistance than standard polyester systems.
• Choose PVDF when the project has stronger UV exposure or longer exterior life requirements.
• Choose the upper end of the thickness range when higher panel rigidity is needed.
• Choose protective film when the visible surface must be protected during forming, transport, or installation.
• Confirm width according to the roll-forming line and final panel layout before production.

8．FAQ

Q1．Is this product PPGI or PPGL
This page is generated as prepainted galvanized steel coil according to your uploaded 彩涂卷 specification, so it is treated as PPGI rather than PPGL.

Q2．What is the valid thickness range
The valid thickness range is 0.12–1.20mm.

Q3．What is the valid width range
The valid width range is 700–1250mm.

Q4．What paint systems are available
The available paint systems are polyester, SMP, and PVDF.

Q5．Can protective film be supplied
Yes. The top side can be supplied with or without protective film according to order requirement.