Prepainted Color Coated Aluminum Coil 3105
Prepainted Color Coated Aluminum Coil 3105 is a non-heat-treatable, manganese-alloyed aluminum coil optimized for building facades, roofing, ceilings, gutters, signboards, and household appliances. It offers excellent corrosion resistance, good forming performance, lightweight strength, and durable color finishes, making it a cost-effective and reliable choice for architectural and industrial applications.
Prepainted Color Coated Aluminum Coil 3105 is based on alloy 3105, a manganese-containing, non-heat-treatable wrought alloy designed for good corrosion resistance and moderate strength. By adding a high-quality organic coating system (polyester, HDPE, PVDF, or polyurethane), the coil becomes a durable, ready-to-use material for both interior and exterior applications.
The 3105 substrate provides a stable, formable core, while the color coating system delivers long-lasting aesthetics, UV resistance, and surface protection. This combination makes it especially suitable where appearance, weight reduction, and long service life are critical.
Features & Benefits
- Good corrosion resistance in urban, industrial, and marine-adjacent environments
- Excellent formability for bending, roll forming, punching, and profiling
- Lightweight and strong enough for most building envelope and cladding uses
- Uniform color and gloss with consistent coating thickness
- Good adhesion of paint to substrate after proper pretreatment
- Wide color range in RAL and custom shades, including metallic and textured finishes
- Environmentally friendly, recyclable aluminum substrate
Typical Applications
Building & Construction
- Roofing sheets and tiles
- Wall cladding and facade panels
- Soffits, ceilings, and eaves
- Gutter systems and downpipes
- Window and door trims
Sign & Display
- Traffic signs and information boards
- Advertising panels and display systems
- Corporate identity and branding panels
Household & Interior
- Appliance panels and casings
- Ceiling systems and partition panels
- Interior decorative panels
Industry & Transport
- Insulation jacketing for HVAC and piping
- Lightweight protective covers and enclosures
- Caravan and modular building panels
Alloy & Temper Information
The core of this product is aluminum alloy 3105 with various tempers, selected according to forming needs and mechanical performance.
Alloy & Temper Table
| Item | Specification / Description |
|---|---|
| Alloy designation | AA 3105 |
| Aluminum series | 3xxx, Mn-alloyed, non-heat-treatable |
| Main strengthening method | Cold work (strain hardening) |
| Common tempers | H14, H16, H18, H24, H26, H28 |
| Typical building temper | H24 / H26 (balanced strength–formability) |
| Forming-intensive uses | Softer tempers such as H14 |
| Harder, flat applications | H18 / H28 where minimal forming is required |
Chemical Composition (Typical Limits)
Although exact composition may vary slightly within the standard range, 3105 is characterized by manganese and trace additions for improved strength and corrosion resistance.
| Element | Symbol | Typical Range (wt. %) | Notes |
|---|---|---|---|
| Aluminum | Al | Balance | Remainder after alloying elements |
| Manganese | Mn | 0.30 – 0.80 | Main alloying element |
| Magnesium | Mg | ≤ 0.05 | Trace, minor solid-solution strengthening |
| Silicon | Si | 0.20 – 0.60 | Impurity/auxiliary element |
| Iron | Fe | 0.00 – 0.70 | Impurity/auxiliary element |
| Copper | Cu | ≤ 0.30 | Slight strength contribution |
| Zinc | Zn | ≤ 0.40 | Minor addition |
| Chromium | Cr | ≤ 0.10 | Trace |
| Titanium | Ti | ≤ 0.10 | Grain refinement |
| Others (each) | - | ≤ 0.05 | Residuals |
| Others (total) | - | ≤ 0.15 | Residuals |
Mechanical Properties (Typical Values)
Values below are indicative for common tempers. Actual values may vary according to thickness, temper, and coating system.
| Property | Unit | 3105 H14 | 3105 H24 | 3105 H26 |
|---|---|---|---|---|
| Tensile strength (Rm) | MPa | 130 – 180 | 150 – 200 | 165 – 215 |
| Yield strength (Rp0.2) | MPa | 85 – 130 | 110 – 160 | 125 – 175 |
| Elongation (A50, approx.) | % | 5 – 10 | 3 – 8 | 2 – 6 |
| Elastic modulus (E) | GPa | ~69 | ~69 | ~69 |
| Density | g/cm³ | ~2.73 | ~2.73 | ~2.73 |
| Brinell hardness (HB, approx.) | HBW | 30 – 45 | 35 – 50 | 40 – 55 |
Dimensional Range
Prepainted Color Coated Aluminum Coil 3105 is supplied in multiple thicknesses, widths, and coil dimensions. Custom sizes are available on request.
| Parameter | Typical Range |
|---|---|
| Coil thickness | 0.20 – 1.50 mm |
| Recommended roofing | 0.30 – 0.70 mm |
| Recommended facade | 0.50 – 1.20 mm |
| Coil width | 20 – 1600 mm (commonly 600 – 1500 mm) |
| Inner diameter (ID) | 405 mm, 505 mm, 508 mm, 610 mm (standard options) |
| Outer diameter (OD) | Up to 1800 mm (depending on thickness and weight) |
| Coil weight | 2 – 8 tons per coil, customizable |
| Width tolerance | ±0.5 mm or tighter on request |
| Thickness tolerance | In accordance with EN / ASTM standards |
Coating Systems
The performance of prepainted coils depends strongly on the coating system. Multiple resin types and layer structures can be supplied to match the application environment.
Coating Type Options
| Coating Type | Typical Use | Advantages |
|---|---|---|
| PE (Polyester) | Interior, mild exterior | Economical, wide color range, good flexibility |
| HDPE | Exterior cladding and roofing | Improved chalking and UV resistance |
| PVDF | High-end facades, tough climates | Excellent color retention and weather resistance |
| PU / SMP | Roofing, wall panels, industrial | Good hardness and durability |
| Back coat (EP/PU) | Inner side, non-visible surface | Adhesion to sealants, corrosion protection |
Typical Coating Structure
| Layer | Side | Thickness (µm) | Function |
|---|---|---|---|
| Top coat | Front | 15 – 25 | Color, gloss, environmental resistance |
| Primer | Front | 5 – 10 | Adhesion, corrosion protection |
| Conversion layer | Both | - | Enhances paint adhesion, corrosion resistance |
| Back coat | Reverse | 5 – 15 | Adhesion, basic protection |
| Optional back primer | Reverse | 3 – 5 | Additional adhesion, durability |
Color, Gloss & Surface Finish
Color-coated 3105 coils are available in standard palettes and custom-matched finishes.
| Parameter | Options / Description |
|---|---|
| Color standard | RAL classic, RAL design, NCS, or customer samples |
| Gloss level | Matt (15–30 GU), silk (30–60 GU), high gloss (70+ GU) |
| Surface textures | Smooth, embossed, stucco, woodgrain, metallic effect |
| Color tolerance | ΔE ≤ 2.0 (typical, vs. approved master panel) |
| Coating uniformity | Controlled for thickness, color, and gloss consistency |
Performance & Durability
With a suitable resin system, Prepainted 3105 coils serve reliably in demanding outdoor conditions. performance indicators are outlined below (typical values; dependent on system and standard).
| Property / Test | Typical Performance Range |
|---|---|
| Pencil hardness | HB – 2H |
| Adhesion (cross-hatch, after cure) | Class 0–1 (excellent adhesion) |
| Impact resistance | > 5 – 10 J (no cracking/peeling) |
| T-bend formability | 0T – 3T (depending on system and thickness) |
| Salt spray resistance | 500 – 1000 h with no significant blistering |
| Humidity resistance | 1000 h without loss of adhesion |
| UV chalking (PVDF) | Minimal chalking even at long-term exposure |
| Service life (PVDF facade) | 20–30+ years with correct design and maintenance |
Processing & Forming
Color Coated Aluminum Coil 3105 is designed for modern continuous-processing lines. It is compatible with most common fabrication techniques.
| Operation | Suitability / Notes |
|---|---|
| Roll forming | Excellent; ensure correct tooling radius to prevent micro-cracks |
| Bending | Good; use recommended min. radii per thickness and coating |
| Shearing & slitting | Clean cutting edges, adjust clearance to avoid edge burr |
| Punching | Suitable; support material to avoid paint chipping |
| Deep drawing | Feasible in softer tempers (H14 or equivalent) |
| Welding | Substrate weldable; local paint removal in weld zone recommended |
| Bonding / sealing | Good adhesion with suitable sealants after cleaning |
Advantages of 3105 for Prepainted Coils
- Higher corrosion resistance than many plain-carbon steel alternatives
- Lower density for reduced structural load and easier installation
- Non-magnetic and naturally resistant to many atmospheric agents
- Stable alloy system with predictable forming behavior
- Fully recyclable, supporting sustainable building certifications
Packaging, Protection & Storage
| Item | Description |
|---|---|
| Coil protection | Plastic film, moisture barrier paper, edge protectors |
| Packing format | Horizontal or vertical eye, steel/wooden pallets |
| Transport protection | Strapping, corner protectors, anti-rub interleaves |
| Recommended storage | Dry, ventilated area, away from corrosive atmospheres |
| Handling | Use soft slings and padded forks to avoid coil damage |
Quick Selection Guide
| Requirement | Recommended Choice |
|---|---|
| High-end architectural facade | 3105 H24/H26 + PVDF top coat |
| Standard roofing and wall panels | 3105 H24/H26 + PE or HDPE |
| Interior ceiling and decoration | 3105 H14/H24 + PE |
| Signboards & display panels | 3105 H24 + PE or PU, high-gloss finish |
| Coastal or harsh UV environment | 3105 H24/H26 + PVDF or high-durability system |
Prepainted Color Coated Aluminum Coil 3105 combines a proven, corrosion-resistant alloy with state-of-the-art coil coating technology, delivering a lightweight, durable, and visually consistent solution for modern architecture, signage, and industry. Through careful selection of temper, thickness, and coating system, it is possible to tailor both performance and appearance to the exact needs of each project.
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