3105 Alloy Color Coated Aluminium Coil for Down Gutter 

Product Introduce:

3105 Alloy Color Coated Aluminium Coil for Down Gutter refers to the 3105 alloy color - coated aluminium coil used for down gutters. 

The relevant information is as follows: Alloy Characteristics : The 3105 alloy belongs to the aluminum - manganese alloy series. It has stable mechanical properties and excellent corrosion resistance, which can effectively resist atmospheric corrosion and extend the service life of down gutters. Its density is about one - third that of steel, and the material is lightweight, facilitating processing and installation, and can reduce the structural load. 

Common coating types include polyester (PE), silicon - modified polyester (SMP), polyvinylidene fluoride (PVDF), etc. The PE coating has a high cost - effectiveness and is suitable for general construction scenarios; the SMP coating has good UV resistance and is suitable for environments with strong sunlight; the PVDF coating has excellent color retention and weather resistance and is often used in high - end buildings. 

Performance Parameters 

Taking 3105 H26 as an example, its tensile strength is generally between 160 - 200MPa, the yield strength is 130 - 170MPa, and the elongation is 2% - 6%. This state of the aluminium coil, while maintaining a certain strength, has good formability and can meet the processing requirements of down gutters. Product Specifications (Made - in - China.com): The thickness is usually between 0.16 - 2.50mm, and the width range is 50 - 2650mm, which can be customized according to requirements. Common colors include white, orange, black, etc., and can be customized according to the RAL color card or Pantone color system.

Application Advantages  

This kind of aluminium coil has good paint adhesion and is not prone to coating peeling during the forming and use process. Its surface coating is uniform with consistent color, which can not only improve the aesthetics of the down gutter but also provide good protection. In addition, it also has good processing performance and can be efficiently made into various specifications of down gutters through processes such as cutting and roll - forming.

Applications:

1. Residential Buildings: Downspouts, rain gutters for villas, apartments, and townhouses—blending with architectural styles while ensuring efficient drainage.

2. Commercial & Public Buildings: Drainage systems for shopping malls, office buildings, hotels, schools, and hospitals—resisting heavy rain and frequent use.

3. Industrial Facilities: Down gutters for factories, warehouses, and workshops—withstanding industrial fumes and harsh outdoor environments.

4. Municipal Engineering: Public infrastructure such as roads, bridges, and municipal buildings—supporting large-scale drainage projects.

5. Villa & High-End Communities: Custom-colored downspouts matching exterior decors—enhancing aesthetic appeal while maintaining functionality.

   
   

Process:

1. Raw Material Inspection: Select high-purity 3003 aluminum ingots, conduct chemical composition and mechanical property tests to ensure compliance with standards.

2. Melting & Casting: Melt the ingots in a professional furnace, cast into aluminum slabs (hot-rolled billets) through continuous casting technology.

3. 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.

4. Annealing Treatment: Heat the cold-rolled coils in an annealing furnace (300-400℃) to improve ductility and reduce internal stress.

5. Surface Pretreatment: Degrease, rinse, and conduct chromate conversion coating (or passivation) to enhance coating adhesion and corrosion resistance.

6. Color Coating: Apply primer and topcoat (PE/PVDF) via roller coating machine—control coating thickness evenly with automatic monitoring.

7. Curing Process: Bake the coated coils in a curing oven (230-250℃) to ensure coating curing and adhesion.

8. Slitting & Cutting: Slit the large coils into custom widths, cut into fixed-length coils or sheets according to customer requirements.

9. Quality Inspection: Test coating adhesion, thickness, color consistency, and mechanical properties; conduct salt spray tests for corrosion resistance.

10. Packaging & Shipping: Wrap coils with moisture-proof film, kraft paper, and steel rings; load into containers with anti-collision protection for export.

FAQS:

1. 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.
2. 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.
3. 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.
4. 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).
5. 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)

If you have needs on the aluminum coil/sheet product,please contact us for more discussing.

Dingang Painted aluminum coil is definately your good choie in the production area.

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)

Email: robert@cnchangsong.com

Phone: +0086 159 6120 6328 (whatsapp / wechat)