Product Introduction
Galvalume Colour Coated Sheet is a high-performance building material with 55% Al-Zn alloy base, offering superior corrosion resistance, excellent color retention and long service life.It combines barrier protection from aluminum and sacrificial protection from zinc, with good formability and heat reflection, ideal for roofing, wall cladding and exterior applications.
| Name | GI Roof sheet | |||
| Grade | SGCC,DX51D+Z,SGLCC,DX51D+AZ | |||
| Thickness | 0.1mm-10.0mm,as your requirement | |||
| Width | 4.0cm-2.4m, or customized | |||
| Length | 1.0m-12.0m, or customzied | |||
| Color | RAL color customized, or according to the sample | |||
| Zinc coating | 30-275g/m2, according to customer's requirement | |||
| Application | Structural use ,roofing, corrugated roofing, commercial use, household appliance, industry. | |||
Key Features
Galvalume colour coated sheet is a kind of steel sheet with organic coating applied on the surface of galvalume substrate. It combines the corrosion resistance of the substrate with the aesthetics and weather resistance of the colour coating, with the following core advantages:
Extreme Corrosion Resistance
55% Al-Zn alloy substrate delivers 2–6 times better corrosion protection than regular galvanized sheets, with up to 20+ years of outdoor service life.
Long-Lasting Weather Performance
Resists fading, chalking and peeling under -40℃~200℃, supported by high-durability coatings and excellent UV & heat resistance.
Strong Formability & Coating Adhesion
Flexible for bending, stamping and rolling; the color coating stays intact without cracking or peeling during fabrication.
Low Maintenance & Aesthetic Versatility
Custom colors and smooth finish avoid on-site painting; easy to clean with water, keeping a great appearance for years.
Long-Term Cost Efficiency
Longer service life cuts replacement and maintenance expenses, providing a lower total lifecycle cost.
Differences Between Galvanized Sheet (GI) and Galvalume Sheet (GL)
When choosing metal sheets for construction, roofing, cladding or outdoor applications, buyers often struggle to decide between standard GI and more advanced GL sheets.
Understanding their core differences helps you pick the right material for long term performance and better value for your projects.
|
Comparison Dimension |
Galvanized Sheet (GI) |
Galvalume Sheet (GL) |
|
Coating Composition |
Pure zinc (≥99%), trace impurities optional |
55%Al+43.5%Zn+1.5%Si alloy coating |
|
Corrosion Principle |
Zinc sacrificial anode protection; general ZnOx film |
Dual protection (Al₂O₃ film + Zn anode); Si boosts adhesion |
|
Corrosion Resistance |
5-10 years outdoor bare; poor in harsh environments |
2-6x GI's resistance; 20+ years outdoor bare; salt-spray resistant |
|
Heat Resistance |
Poor; >120℃ softens zinc layer (melting point 419℃) |
Excellent; withstands 300℃ long-term (Al melting point 660℃) |
|
Processability |
Superior plasticity; easy bending/stamping |
Good for ≤90° bending; deep processing needs process control |
|
Applications |
Indoor, home appliances, mild corrosion scenarios |
Outdoor, coastal/harsh environments, heat-resistant parts |
Application of Galvalume Colour Coated Sheet
• Industrial & commercial building roofing and wall cladding
• Agricultural buildings: barns, greenhouses, storage sheds
• Prefabricated houses, container houses and light steel structures
• Garage doors, shutters and interior decorative panels
• Coastal & anti-corrosion projects, photovoltaic brackets
Packing and delivery
Lined with rust-proof paper for inner protection
Outer wrapped with steel sheet for extra safety
Optional wooden pallet packing available
Why you choose us
We excel in galvalume colour coated sheet, GI and GL sheet production with core strengths to support your needs:
Advanced Production Lines
Equipped with professional hot-dip coating and colour coating lines, ensuring stable coating uniformity and high precision for various processing requirements.
Strict Quality Control
Full-process inspection from substrate selection to finished products, complying with international standards to guarantee consistent corrosion and weather resistance.
Customization Capability
Flexible supply of different coating thicknesses, colours and sizes, tailored for roofing, construction and harsh-environment applications.
Cost & Delivery Assurance
Large-scale production reduces unit cost; mature supply chain ensures on-time delivery for bulk orders.
Technical Support
Professional team provides installation and maintenance guidance, optimizing material selection based on your specific application scenarios.
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