When sourcing high-performance roofing and cladding materials, the color coated aluzinc steel coil stands out as a superior alternative to traditional galvanized options. Combining the corrosion resistance of aluzinc (55% aluminum, 43.4% zinc, 1.6% silicon) with a durable paint finish, this product—often called PPGL coil—delivers extended service life in harsh environments. At ChinaCNU Steel, our Qingdao factory produces ISO-certified color coated aluzinc steel coils with FOB pricing, backed by 15+ years of export experience to over 50 countries. With a minimum order quantity of just 25 tons, we make premium PPGL accessible for large-scale projects.
What Is Color Coated Aluzinc Steel Coil?
A color coated aluzinc steel coil starts with a cold-rolled steel substrate that is hot-dip coated with an aluzinc alloy (55% Al, 43.4% Zn, 1.6% Si). This base metal—also known as galvalume or GL coil—offers 2–4 times the corrosion resistance of standard GI coil (galvanized steel coil). After the metallic coating, the surface is chemically treated, primed, and painted with a topcoat (polyester, PVDF, or SMP) and a protective backing. The result is a prepainted metal coil that combines structural strength with aesthetic flexibility. Common applications include metal roofs, wall panels, garage doors, and agricultural buildings.
Zinc Coating Grade Comparison – Corrosion Protection Level
Reference: ISO 1461 / ASTM A653 | ChinaCNU Steel Technical Dept.
PPGI vs. PPGL: Key Differences
While PPGI coil (pre-painted galvanized iron) uses a zinc-only coating, PPGL (pre-painted galvalume) uses the aluzinc alloy. The aluminum in PPGL forms a passive oxide layer that prevents white rust and edge creep, making it the better choice for coastal or industrial environments. For projects requiring long-term color retention and minimal maintenance, the color coated aluzinc steel coil outperforms standard PPGI in salt-spray tests by up to 300%.
Technical Specifications and Grade Options
Our color coated aluzinc steel coils conform to ASTM A792, EN 10169, and JIS G3321 standards. Available thicknesses range from 0.25 mm to 1.2 mm, widths from 900 mm to 1250 mm, and coil weights up to 10 tons. The paint system can be polyester (PE), silicon modified polyester (SMP), or polyvinylidene fluoride (PVDF) for maximum UV resistance. We offer both reverse coating (for aesthetic interior surfaces) and standard single-sided coating.
| Property | Color Coated Aluzinc Coil (PPGL) | Standard GI Coil (PPGI) |
|---|---|---|
| Metallic coating | 55% Al + 43.4% Zn + 1.6% Si | 99.7% Zn + 0.3% Al |
| Coating weight (g/m²) | 100–200 (AZ150, AZ180) | 100–275 (Z275, Z350) |
| Salt spray resistance (hours) | 1,500–2,500 | 500–1,000 |
| Typical paint durability | 20–30 years (PVDF) | 10–15 years (PE) |
| Max operating temperature | 315°C | 200°C |
| Common applications | Coastal roofs, industrial walls | Rural sheds, interior panels |
Why Choose ChinaCNU Steel for Color Coated Aluzinc Coils?
ISO-Certified Production in Qingdao
Our Qingdao factory operates under ISO 9001:2026 quality management and ISO 14001:2026 environmental standards. Every color coated aluzinc steel coil undergoes rigorous testing for coating thickness, adhesion, flexibility, and color consistency. We maintain a 15+ year track record of zero major quality claims across 50+ export markets, including the USA, UAE, Australia, and Southeast Asia.
Competitive FOB Pricing with MOQ 25 Tons
Unlike competitors who require MOQs of 50–100 tons, ChinaCNU Steel offers a flexible MOQ of 25 tons per specification. Our FOB Tianjin pricing includes all export documentation, seaworthy packing, and third-party inspection (SGS or BV) upon request. For a quick cost comparison, request a quote via our RFQ system—we guarantee price transparency with no hidden fees.
Applications and Performance Benefits
Architectural Roofing and Cladding
The color coated aluzinc steel coil is the preferred material for standing seam roofs, corrugated sheets, and sandwich panels. Its reflective aluzinc substrate reduces heat absorption by up to 40% compared to dark-colored GI coil, lowering building cooling costs. In salt-laden coastal environments, PPGL resists corrosion where standard galvanized steel coil would fail within 5 years.
Agricultural and Industrial Structures
Poultry sheds, grain silos, and factory walls benefit from the anti-fingerprint and chemical resistance of the painted surface. The aluzinc coating prevents red rust from spreading even if the paint is scratched—a critical advantage over PPGI coil. With 15+ years of export data, we have documented case studies showing 25+ year service life in moderate climates.
FAQ – Color Coated Aluzinc Steel Coil
1. What is the difference between color coated aluzinc coil and standard galvanized coil?
Aluzinc (55% Al) offers 2–4× better corrosion resistance than zinc-only galvanized coating. It also withstands higher temperatures and reflects more solar heat. For long-term projects, the color coated aluzinc steel coil is the economical choice despite a slightly higher initial cost.
2. Can I order custom colors or paint systems?
Yes. Our Qingdao factory supports RAL, NCS, and custom color matching. We offer polyester (PE), SMP, PVDF, and HDP paint systems. Minimum order for custom colors is 25 tons per color. Standard stock colors include red, blue, white, and grey with 7–10 day lead time.
3. What is the minimum order quantity (MOQ) for FOB delivery?
Our standard MOQ is 25 tons per specification. For mixed containers (multiple colors or gauges), the minimum is 25 tons total. This is significantly lower than many competitors who require 50–100 tons. FOB Tianjin pricing includes loading and export packing.
4. How do you ensure the paint adhesion and color consistency?
Every production batch undergoes T-bend, impact, and MEK rub tests. We use a 5-roll reverse coating process for uniform paint thickness (±5 microns). Color consistency is verified with a spectrophotometer against the approved master sample. ISO 9001:2026 certification ensures traceability from substrate to finished coil.
5. What certifications do your color coated aluzinc coils have?
Our products meet ASTM A792, EN 10169, and JIS G3321. We provide mill certificates, SGS/BV inspection reports, and ISO certification documents. For projects requiring FM Approvals or CE marking, we can arrange additional testing at cost.
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