275g/m² Zinc Coating Prepainted Color Steel Coil with SMP Polyester Coating for Roofing and Building Panels

275g/m² Zinc Coating Prepainted Color Steel Coil with SMP Polyester Coating for Roofing and Building Panels

1．Product Overview

275g/m² zinc coating prepainted color steel coil is designed for roofing sheets, wall cladding panels, steel structure buildings, and exterior construction applications requiring enhanced corrosion resistance and stable coating performance.

The product combines hot dipped galvanized steel substrate with primer and finish paint layers. The zinc coating provides corrosion protection for the steel substrate, while the painted surface improves weatherability, appearance consistency, and outdoor durability.

2．Technical Solution

The steel coil uses galvanized substrate together with continuous color coating technology.

The top surface coating structure uses 15–20 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 coating improves weather resistance and outdoor durability compared with standard polyester coating. PVDF coating is suitable for stronger UV exposure and long-term exterior applications.

The zinc coating range of 40–275g/m² supports different environmental exposure conditions and corrosion protection requirements.

3．Specifications

4．Application

This prepainted color steel coil is suitable for roofing sheets, wall cladding panels, steel structure workshops, warehouses, airport buildings, storage facilities, prefabricated buildings, home appliance panels, and decorative construction sheets.

It is commonly used where the final product requires stable forming performance, exterior durability, and corrosion resistance.

5．Processing

• The coil can be supplied in full coil form or processed into cut-to-length sheets.
• It is suitable for roll forming, bending, profiling, roofing sheet production, and wall panel fabrication.
• Protective film can be applied on the top side to reduce surface scratches during transportation and installation.
• Custom slitting and cut-to-length processing are available according to project requirements.

6．Advantages

• The galvanized substrate with up to 275g/m² zinc coating provides improved corrosion protection for outdoor environments.
• The 0.18–1.20mm thickness range supports mainstream roofing and cladding production requirements.
• The 700–1250mm width range is compatible with common roll-forming production lines.
• Polyester, SMP, and PVDF paint systems support different weather exposure conditions.
• The defined coating structure improves surface consistency and coating adhesion.
• Commercial quality and LFQ options support bending, profiling, and forming applications.

7．How to Choose

• Choose polyester coating for standard roofing and wall cladding applications.
• Choose SMP coating for improved weather resistance and outdoor durability.
• Choose PVDF coating for projects requiring stronger UV resistance and long-term exterior performance.
• Choose higher zinc coating levels for coastal, humid, or industrial environments.
• Choose embossed surface when additional decorative appearance is required.
• Confirm coating type, gloss level, color, and protective film requirements before production.

8．FAQ

Q1．What is the maximum zinc coating available
The available zinc coating range is 40–275g/m².

Q2．What coating systems are available
Polyester, SMP, and PVDF coating systems are available.

Q3．What is the available thickness range
The available thickness range is 0.18–1.20mm.

Q4．Can customized RAL colors be supplied
Yes. Customized colors can be produced according to RAL Card or client requirements.

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