3003 pre-painted aluminum coil is a coil product made from 3003 aluminum alloy as the base material, with one or more layers of organic coating applied to the surface, combining metal strength with the aesthetic appeal of coatings.
3003 aluminum alloy is an aluminum-manganese alloy with good corrosion resistance, moderate strength, and excellent formability, making it an ideal substrate for coated aluminum coils.
Pre-painted aluminum coil refers to aluminum substrate that is coated with a protective and decorative coating (usually PVDF or polyester) in continuous coil form before any fabrication. These coatings enhance weather resistance, color retention, and service life, making them an ideal choice for architectural and industrial applications.
3003 pre-painted aluminum coil is a commonly used industrial material that combines the strength and corrosion resistance of the 3000 series aluminum-manganese alloys with protective and decorative color coatings. Due to its “moderate strength” and high formability, it is widely used in construction and manufacturing fields.
The 3003 alloy is selected for pre-painting because its strength is approximately 20% higher than that of the 1100 series aluminum alloy, while still being easy to process.
3003 pre-painted aluminum coil perfectly integrates the excellent physical properties of 3003 aluminum alloy with the versatility of modern coating technologies, making it an ideal material for architectural, industrial, and decorative applications. When selecting, factors such as service environment, budget, and performance requirements should be considered to balance coating type, thickness, and surface finish, ensuring the product meets functional needs while maintaining good cost-effectiveness.
3003 Pre-painted Aluminum Coil Specifications
| Property | Typical Specification |
| Alloy / Temper | 3003 / H14, H16, H24, O |
| Coating Types | PVDF (High durability) or PE (Polyester) |
| Thickness | 0.2mm – 6.0mm |
| Width | 20mm – 2, 600mm |
| Standard Colors | RAL colors, metallic, or wood/stone patterns |
| Coating Thickness | PE: ≥18μm; PVDF: ≥25μm |
| Surface Finish | Matte (10–40% gloss), High gloss (60–90% gloss), embossed, wood grain, etc. |
3003 Pre-painted Aluminum Coil Coating Types
| Coating Type | Thickness Requirement | Price Range | Weather Resistance | Main Applications |
| PE (Polyester) | ≥18μm | Economical (Entry level) | 7–8 years (Indoor) | Interior decoration, advertising panels, appliance housings |
| HDP (High-durability polyester) | ≥20μm | Mid to high-end | 10–15 years | Building facades, roofing, general outdoor applications |
| PVDF (Fluorocarbon) | ≥25μm | High-end (30–50% higher than PE) | 20–30+ years | High-rise buildings, airports, commercial landmarks |
| Special Coatings | Customized | Customized | Customized | Wood grain, stone pattern, self-cleaning, antibacterial, and other special applications |
3003 Pre-painted Aluminum Coil Features
- Alloy & Temper: 3003 alloy (3004/3105 options are sometimes available), with H24 being the most common temper.
- Coating Types: PVDF (high durability) or PE/SMP (cost-effective) coating systems.
- Thickness: Typically ranges from about 0.2 mm to 1.5 mm (depending on application).
- Colors / Surface Finishes: Full RAL color range, wood grain, stone pattern, textured finishes, and more.
- Applications: Roofing, curtain walls, ceilings, gutters, signage, interior/exterior wall cladding.
- Non-heat-treatable; mechanical properties are improved through cold working.
- Low density (approximately 2.7 g/cm³), lightweight, easy to transport and install.
- Excellent corrosion resistance; a dense natural aluminum oxide film forms on the surface, providing resistance to atmospheric, water, and chemical corrosion.
- Good weldability and excellent workability, suitable for various forming processes.
Why Choose 3003 Pre-painted Coil?
- Corrosion Resistance: The addition of manganese (approx. 4% Mn) gives it outstanding atmospheric corrosion resistance, making it ideal for outdoor environments.
- Formability: After painting, it can be easily bent, stamped, or roll-formed without cracking or peeling of the coating (typically verified by the “T-bend” test).
- Weather Resistance (PVDF): When coated with PVDF, the coil can resist UV radiation and harsh weather conditions for more than 20 years without noticeable fading.
- Lightweight: Density of approximately 2.73 g/cm³, much lighter than steel, reducing structural load and transportation costs.
3003 Pre-painted Aluminum Coil Applications
Due to its attractive appearance and durability, 3003 pre-painted aluminum is widely used in the following fields:
- Architectural Decoration: Most commonly used in roofing systems, exterior wall panels, ceilings, curtain wall panels, rain gutters, rolling shutters, etc.
- Industrial & Civil Use: Air-conditioning ducts, electrical appliance panels, containers and components requiring high corrosion resistance.
- HVAC: Air conditioner fins and radiator components, which require very high corrosion resistance.
- Transportation: Truck trailer roofs, signage, and fuel tank housings.
- Home Appliances: Housings for refrigerators and ovens.
- Special Applications: Certain coatings (such as food-grade) can be used for packaging; high-reflectivity mirror aluminum coils can be used for lighting fixtures, solar reflectors, etc.
Construction Industry
- Roofing systems: Color-coated roofing sheets, metal roofs—waterproof, durable, and aesthetically pleasing.
- Exterior wall decoration: Curtain walls and decorative panels enhance building texture and resist wind and rain erosion.
- Interior decoration: Ceilings and wall finishes with diverse colors and easy cleaning.
- Ventilation ducts: Air-conditioning ducts with corrosion resistance and reduced bacterial growth.
Industry & Home Appliances
- Appliance housings: Refrigerator, air conditioner, and washing machine panels—attractive and durable.
- Electronic equipment: Enclosures and heat sinks with good heat dissipation and low weight.
- Chemical equipment: Storage tanks and pipelines with acid and alkali resistance and long service life.
- Food packaging: Non-toxic and odorless, meeting food safety standards, suitable for food processing equipment.
Transportation
- Automotive interiors: Door panels, dashboards, headliners—lightweight and attractive.
- Automotive exteriors: Bumpers and roof racks with strong weather resistance and minimal fading.
- Rail transit: High-speed rail and subway interiors combining lightweight design with safety.
- Marine: Cabin interiors and deck decoration with salt spray corrosion resistance, suitable for marine environments.
| Application Scenario | Typical Thickness | Recommended Alloy / Temper | Coating Type | Surface Finish |
| Metal Roofing | 0.6mm – 1.2mm | 3003 / 3004-H24 | PVDF or HDP | Embossed (diamond/orange peel), matte |
| Architectural Curtain Wall | 1.5mm – 4.0mm | 3003-H14 / 5052 | PVDF (fluorocarbon) | Metallic paint, pearlescent paint, stone-like finish |
| Interior Decoration | 0.2mm – 1.0mm | 3003 / 1100-O/H14 | PE (polyester) | Wood grain, brushed, mirror, high gloss |
3003 Pre-painted Aluminum Sheet Coil for Roofing Systems
Roofing is continuously exposed to UV radiation, rain, and snow loads, requiring the highest levels of corrosion resistance and workability.
- Thickness Selection: Industrial buildings commonly use 0.7mm–0.9mm; for large-span roofs, thickness may be increased to 1.0mm–1.2mm to improve wind pressure resistance.
- Coating Recommendation: PVDF (fluorocarbon coating) or HDP (high-durability polyester) is required. PVDF can ensure more than 20 years of color retention without fading or chalking.
- Surface Treatment: Embossed finishes are commonly used. This not only increases the stiffness of the 3003 aluminum coil but also reduces light pollution by avoiding glare from direct sunlight.
3003 Pre-painted Aluminum Sheet Coil for Curtain Walls & Cladding
Curtain walls primarily focus on flatness and visual appearance.
- Thickness Selection: Aluminum veneer curtain walls typically use 2.0mm, 2.5mm, or 3.0mm thickness to prevent the “oil canning” effect over large surface areas.
- Aluminum Composite Panel (ACP) Skins: Usually require only a 0.3mm–0.5mm aluminum sheet layer.
- Coating Recommendation: 70% Kynar 500 PVDF is the industry standard, providing resistance to urban acid rain and air pollution.
- Special Treatments: To simulate natural materials, multi-color spraying processes are often used to create stone-like or wood-grain effects, reducing building weight and overall cost.
3003 Pre-painted Aluminum Sheet Coil for Interior Decoration
Indoor environments are stable, with primary emphasis on formability and visual diversity.
- Thickness Selection: Suspended ceilings usually range from 0.5mm–0.8mm; wall panels may use up to 1.0mm.
- Coating Recommendation: PE (polyester coating) is the preferred choice due to its high color saturation, wide gloss range (from matte to high gloss), and significantly lower cost than PVDF.
- Special Treatments: Brushed finish to enhance a premium metallic appearance.
- Mirror finish: Used on ceilings to enhance spatial openness.
- Perforated: Combined with acoustic backing materials for sound control in concert halls or offices.
PVDF vs. PE: For building facades exposed to sunlight and pollution, PVDF coatings are recommended.
For cost-sensitive applications such as interior decoration or signage, PE (polyester) coatings are recommended.
3003 Pre-painted Aluminum Coil Performance Advantages
- Excellent weather resistance: UV resistance, acid and alkali resistance, salt spray resistance, suitable for various climatic environments.
- Long-lasting color: Coatings resist fading and maintain appearance for 10–30 years of service life.
- Excellent processability: Can be bent, stamped, and sheared to meet various design requirements.
- Energy-saving and environmentally friendly: Recyclable and reusable, in line with modern green building concepts.
- Low maintenance cost: Resistant to dirt accumulation, easy to clean, reducing long-term maintenance expenses.
3003 Pre-painted Aluminum Coil Manufacturing Process
- Uncoiling & Splicing: Large aluminum coils are uncoiled and end-welded for continuous production.
- Pretreatment: Degreasing, cleaning, and chemical conversion treatment to ensure coating adhesion.
- Coating: Roller coating with PE, PVDF, or other coatings; single-sided or double-sided coating available.
- Curing: High-temperature baking (approximately 200–220°C) to cure the coating and form a durable protective film.
- Slitting & Packaging: Cut into specified sizes according to customer requirements.
3003 Pre-painted Aluminum Coil Purchasing Guide
Select According to Application Scenario
- Indoor applications: Prioritize PE coatings for cost-effectiveness and rich color options.
- General outdoor use: HDP coatings offer excellent value with long service life.
- High-rise buildings / coastal areas: PVDF coatings are the best choice, offering ultra-long service life and resistance to extreme climates.
- Special functional requirements: Choose corresponding special coatings (such as self-cleaning or antibacterial).
Key Quality Inspection Points
- Appearance inspection: Uniform color, no obvious scratches, bubbles, or color differences.
- Coating adhesion: Cross-hatch test can be used; the coating should not peel off.
- Thickness measurement: Substrate and coating thickness should meet standard requirements; can be measured with a micrometer.
- Material verification: Use a spectrometer to verify alloy composition and ensure it is 3003 aluminum alloy.