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Engineered exclusively for roof gutter and downspout fabrication, this custom gauge color coated aluminium coil is a high-performance outdoor building material. It is produced from premium 3003 aluminum-manganese alloy, which boasts exceptional corrosion resistance, superior ductility and reliable outdoor weatherability, fully adapting to long-term outdoor drainage service conditions.
Adopting advanced continuous roller coating technology, the substrate is covered with high-grade polyester (PE) or PVDF fluorocarbon coatings. The finished paint film delivers firm adhesion, remarkable anti-fading and anti-rust performance. It can steadily withstand erosion from rainfall, intense ultraviolet radiation and drastic temperature changes all year round, maintaining intact performance for years.
We offer full customization on coil thickness, width, as well as complete RAL and PANTONE color options to satisfy the personalized demands of residential, commercial and industrial drainage projects. Featuring a perfect combination of light weight and structural rigidity, the material cuts down difficulties in transportation and on-site installation, helping clients lower comprehensive construction costs. Manufactured in strict accordance with ASTM, EN and GB international standards, this aluminium coil is a trustworthy raw material for gutter and downspout production across the globe.
Parameter | Specification |
|---|---|
Alloy Grade | 3003 (Al-Mn alloy) |
Thickness Range | 0.3mm - 1.2mm (customizable) |
Width Range | 800mm - 1600mm (standard: 1000mm/1220mm/1500mm) |
Length | 20m - 50m/coil (or custom cut-to-length) |
Coating Type | PE (polyester), PVDF (fluorocarbon), PE/PVDF composite |
Coating Thickness | Primer: 5-10μm; Topcoat: 15-25μm (total: 20-35μm) |
Color Standard | RAL, PANTONE, or custom color matching |
Surface Finish | Matte, glossy, semi-glossy |
Corrosion Resistance | Salt spray test ≥ 1000 hours (no rust) |
Weatherability | Anti-fading rate ≥ 95% (5-year outdoor exposure) |
Tensile Strength | 120-180 MPa |
Elongation Rate | ≥ 15% |
Application Temperature | -40℃ to +80℃ |
Certification | ASTM B209, EN 573-3, GB/T 3880, ISO 9001, SGS |
Residential Buildings: Downspouts, rain gutters for villas, apartments, and townhouses—blending with architectural styles while ensuring efficient drainage.
Commercial & Public Buildings: Drainage systems for shopping malls, office buildings, hotels, schools, and hospitals—resisting heavy rain and frequent use.
Industrial Facilities: Down gutters for factories, warehouses, and workshops—withstanding industrial fumes and harsh outdoor environments.
Municipal Engineering: Public infrastructure such as roads, bridges, and municipal buildings—supporting large-scale drainage projects.
Villa & High-End Communities: Custom-colored downspouts matching exterior decors—enhancing aesthetic appeal while maintaining functionality.
Raw Material Inspection: Select high-purity 3003 aluminum ingots, conduct chemical composition and mechanical property tests to ensure compliance with standards.
Melting & Casting: Melt the ingots in a professional furnace, cast into aluminum slabs (hot-rolled billets) through continuous casting technology.
Hot Rolling & Cold Rolling: Hot-roll the slabs into thick coils (6-10mm), then cold-roll to the target thickness (0.3-1.2mm) with precise thickness control.
Annealing Treatment: Heat the cold-rolled coils in an annealing furnace (300-400℃) to improve ductility and reduce internal stress.
Surface Pretreatment: Degrease, rinse, and conduct chromate conversion coating (or passivation) to enhance coating adhesion and corrosion resistance.
Color Coating: Apply primer and topcoat (PE/PVDF) via roller coating machine—control coating thickness evenly with automatic monitoring.
Curing Process: Bake the coated coils in a curing oven (230-250℃) to ensure coating curing and adhesion.
Slitting & Cutting: Slit the large coils into custom widths, cut into fixed-length coils or sheets according to customer requirements.
Quality Inspection: Test coating adhesion, thickness, color consistency, and mechanical properties; conduct salt spray tests for corrosion resistance.
Packaging & Shipping: Wrap coils with moisture-proof film, kraft paper, and steel rings; load into containers with anti-collision protection for export.
Q: Why is 3003 alloy suitable for down gutter applications?A: 3003 alloy is an Al-Mn alloy with excellent corrosion resistance (superior to pure aluminum), good ductility for bending and forming (easy to fabricate into downspouts), and lightweight (reduces installation labor and structural load). It balances cost and performance, making it the most widely used alloy for building drainage systems.
Q: How long does the color coating last outdoors?A: PE coating has a service life of 8-12 years, while PVDF coating (with fluorocarbon content ≥70%) can last 15-20 years. Both coatings are UV-resistant, anti-fading, and anti-cracking, ensuring long-term aesthetic and protective performance in outdoor environments.
Q: Can I customize the thickness, width, and color of the coil?A: Yes. We support custom thickness (0.3-1.2mm), width (800-1600mm), and color (RAL/PANTONE/customer-provided samples). Minimum order quantity (MOQ) for custom specifications is 5 tons, and sample confirmation is available before mass production.
Q: What certifications do your products have?A: Our 3003 color coated aluminium coils comply with international standards such as ASTM B209 (US), EN 573-3 (EU), and GB/T 3880 (China). We also hold ISO 9001 quality management system certification, and SGS/BV test reports for corrosion resistance, coating adhesion, and environmental friendliness (RoHS compliant).
Q: What is the lead time for bulk orders?A: For standard specifications (common thickness/width/color), lead time is 7-10 working days. For custom specifications, lead time is 12-15 working days. Shipping time depends on the destination port (e.g., 25-35 days to North America/Europe, 7-15 days to Southeast Asia).
Export Standard Seaworthy Packing With Wooden Pallets In Horizontal Or Vertical (As Per The Requirements Of Clients)
Dingang - The Professional Manufacturer On The Aluminum Alloy Color Coating Aluminum Coil / Sheet Since 2002
Welcome to enquiry us if you have any demand on the coating aluminum coil / sheet material.
Changzhou Dingang Metal Material Co,Ltd.
Robert Tang (Sales Director)
