GB/T 12754 Prepainted Color Steel Coil with SMP Polyester Coating for Roofing and Building Panels

GB/T 12754 Prepainted Color Steel Coil with SMP Polyester Coating for Roofing and Building Panels

1．Product Overview

GB/T 12754 prepainted color steel coil is designed for roofing sheets, wall cladding, building panels, and home appliance applications requiring a finished color surface and reliable substrate protection.

The product uses a hot dipped galvanized steel base with a controlled paint coating system. The zinc coating protects the steel substrate, while the color coating improves surface appearance, weatherability, and consistency for visible applications.

2．Technical Solution

The coil combines galvanized steel substrate with primer and finish paint layers. The zinc coating range is 20–275g/m², allowing selection according to service environment and corrosion protection requirements.

The top surface uses 10–20 micron polyester plus 5 micron primer. The back surface uses 5–7 micron or 7–8 micron polyester plus 5 micron primer. Available paint systems include polyester, SMP, and PVDF. SMP is suitable for projects requiring improved weather resistance compared with standard polyester coating.

3．Specifications

4．Application

This prepainted color steel coil is suitable for roofing sheets, wall panels, steel structure buildings, workshops, warehouses, airports, storerooms, home appliance panels, and decorative building sheets.

It is commonly used where the final product requires a clean painted appearance, stable forming performance, and corrosion protection.

5．Processing

• The coil can be supplied for cut-to-length sheet production.
• It can be slit into narrower widths for roofing sheet and wall panel fabrication.
• It is suitable for roll forming, bending, profiling, and general sheet processing.
• Protective film can be applied on the top side when surface protection is required during processing, transportation, or installation.

6．Advantages

• The galvanized substrate provides 20–275g/m² zinc coating for base corrosion protection.
• The 0.12–1.20mm thickness range covers common roofing and panel fabrication requirements.
• The 700–1250mm width range fits mainstream roll-forming and cladding production lines.
• Polyester, SMP, and PVDF paint systems support different weather exposure requirements.
• The defined top and back coating structure helps maintain stable coating performance.
• Coil ID 508mm / 610mm and max. 13 MT coil weight are suitable for standard processing equipment.

7．How to Choose

• Choose polyester for standard roofing sheets, wall panels, and general building applications.
• Choose SMP when improved weather resistance and better outdoor performance are required.
• Choose PVDF for higher UV exposure and longer exterior service requirements.
• Choose higher zinc coating levels for humid or more exposed environments.
• Choose thicker material when higher panel rigidity is needed.
• Confirm color, gloss, protective film, coil ID, and final processing method before production.

8．FAQ

Q1．What is SMP coating used for
SMP coating is used when better weather resistance and surface durability are required compared with standard polyester coating.

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

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

Q4．Can customized colors be supplied
Yes. Colors can be supplied according to RAL Card or client request.

Q5．Can protective film be applied
Yes. Protective film can be applied on the top side when required.