Introduction
Colour GI Sheet is a premium-grade galvanized iron sheet with a color coating, offering an attractive finish and applying to a wide range of applications.
| Tolerance | ±1% |
| Zinc coating | 30-275g/m2, according to customer's requirement |
| Certificate | JIS, ISO9001, API , BIS, Gs |
| Surface | Hot-dip Galvanized |
| RAL Color | Can be customized |
| Length | 1.0m-12.0m, customized |
| Width | 4.0cm-2.4m, customized |
| Technique | Hot-dipped galvanized |
| Applications range | home appliance, building material, machinery, roofing sheet, metal roofing, container panels, etc. |
Features
- Excellent Corrosion Resistance
The galvanized steel substrate combined with a protective color coating effectively resists rust and environmental corrosion, helping extend the service life of the sheet.
- Excellent Weather Resistance
The combination of galvanized steel and advanced colour coating, these sheets exhibit excellent resistance to weathering, UV rays, moisture, and chemical exposure.
- Environmentally Friendly and good fire resistance
The sheets also offer good fire resistance and can be recycled, supporting sustainable building practices
Thickness and Tolerance
The national standard tolerance for the thickness of color-coated steel plates is usually within ±0.02 mm to ±0.05 mm, depending on the base plate thickness and coating process. According to the national standard GB/T 12754-2019, "Color Coated Steel Plates and Steel Strips," the thickness tolerance of color-coated steel plates is mainly divided into the following categories:
| thickness | tolerance | |||
| thickness is ≤ 0.5mm | the tolerance is ± 0.05mm | |||
| thickness is 0.5mm to 1.2mm | the tolerance is ± 0.06mm | |||
| the thickness is ≥ 1.2mm | the tolerance is ± 0.07mm | |||
| Sub-layer thickness tolerance: | ||||
| The coating thickness is usually 20μm to 25μm, with a tolerance of ± 2μm | ||||
Customization Options
- Color Customization
Available in a variety of colours such as red, blue, green, yellow, and more, the Colour GI Sheets allow you to select the perfect shade for your specific requirements.
- Surface Finish Options
Different finishes such as glossy, matte, textured, or patterned surfaces can be selected depending on project design requirements.
- Width and Length Customization
Sheet dimensions can be customized according to project specifications or installation requirements.
FAQ
Q: How is the Surface of Colour GI Sheets Prepared?
A: The steel substrate is carefully cleaned to remove oil and impurities using a soft cloth.
Filtered and dried air removes dust particles to ensure a clean surface.
Surface roughness is controlled at Ra ≤ 0.8 μm, providing optimal adhesion for primer and coatings.
Q: What is the coating process for Colour GI Sheets?
A: Primer Application: Applied using a reverse roll coating method with a roll speed ratio of 100:120–150 and wet film thickness tolerance of ±3 μm.
Intermediate Layer Treatment: Fills surface pores and levels the surface, polished to above 600 mesh at 40°C ± 2°C.
Topcoat Application: Coating viscosity is controlled at 10–20 seconds (25°C, Kopp-4 cup 10–25 mL) and spraying pressure at 0.4–0.5 MPa, ensuring a smooth, vibrant finish.
Q: How are Colour GI Sheets Cured and Finished?
A: UV Glossy Coatings: Light intensity is adjusted to 800–1200 mJ/cm² for proper curing.
Powder Coatings: Cured at 240–260°C to achieve a durable and long-lasting finish.
These curing steps ensure the coating hardens fully, enhancing durability, corrosion resistance, and aesthetic quality.
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