Brush Colors Coated Aluminium Strips
Brush colors coated aluminium strips combine the warm metallic character of a brushed surface with the long-lasting protection of a factory-applied color coating. The material is produced from aluminium coil or strip that is mechanically brushed to create fine, directional lines, then treated and coated with decorative paint systems. It delivers a refined metal appearance while offering better color consistency, corrosion resistance, and fabrication efficiency than many post-painted metal parts.
This strip is widely selected for products requiring a premium visual effect without the high cost or maintenance demands of stainless steel, copper, or solid brass. Brushed gold, champagne, silver, bronze, black, grey, red, blue, and custom RAL colors can be supplied for interior and exterior-facing components. Depending on the coating system, brush colors coated aluminium strips can be formed, slit, stamped, roll-formed, bent, or laminated into finished profiles and assemblies.
Material Structure and Surface Effect
The brushed finish is formed by controlled mechanical abrasion. Fine linear grain marks are created along the rolling direction, providing a satin-like appearance that softens glare and helps conceal minor handling marks. After brushing, the aluminium receives cleaning and conversion treatment before coating. This preparation supports reliable paint adhesion and improves resistance to moisture and corrosive environments.
| Layer | Function | Typical Characteristics |
|---|---|---|
| Aluminium substrate | Provides strength, formability, and low weight | 1xxx, 3xxx, or 5xxx alloy strip |
| Surface cleaning | Removes rolling oil and contaminants | Chemical degreasing and rinsing |
| Conversion layer | Enhances adhesion and corrosion protection | Chrome-free or chromate treatment options |
| Primer coating | Builds adhesion and barrier protection | Approx. 4-8 μm, subject to coating design |
| Brushed decorative finish | Creates directional metallic texture | Fine, uniform grain along strip length |
| Top coating | Provides color, gloss, weatherability | PE, SMP, HDPE, PVDF, or special lacquer |
| Back coating | Protects reverse side during fabrication | Usually 5-10 μm, optional service-grade coating |
The visible brushing direction should be confirmed before production, especially for fascia, trim, appliance panels, ceiling strips, and architectural joints. Consistent grain alignment gives completed products a cleaner, more continuous appearance.
Common Alloys and Temper Conditions
Alloy selection depends on required forming depth, mechanical strength, corrosion exposure, and final application. AA 3003 and AA 3105 are widely used for painted decorative strip because they provide an effective balance of formability, strength, and coating compatibility. AA 5052 is often chosen where higher strength and improved corrosion resistance are needed.
| Alloy | Main Alloying Elements | Typical Temper | Suitable Uses |
|---|---|---|---|
| AA 1050 | Aluminium, minor Fe and Si | H14, H24 | Light decorative trim, reflectors, general bending |
| AA 1060 | Aluminium, minor Fe and Si | H14, H24 | Interior strips, signage, low-strength profiles |
| AA 1100 | Aluminium with controlled Cu | H14, H24 | Decorative components and forming applications |
| AA 3003 | Mn, minor Cu | H14, H16, H24 | Roofing accessories, shutters, appliance panels |
| AA 3105 | Mn, Mg | H14, H16, H24 | Building trim, ceiling systems, coated fascia |
| AA 5052 | Mg, Cr | H32, H34 | Transport components, humid areas, marine-adjacent use |
| Temper | Condition | Forming Behavior | Typical Selection Reason |
|---|---|---|---|
| H14 | Strain-hardened, half hard | Good bending with moderate rigidity | General roll forming and slitting |
| H16 | Strain-hardened, three-quarter hard | Higher stiffness, reduced deep drawing ability | Flat panels and rigid trim |
| H24 | Strain-hardened and partially annealed | Balanced strength and bend performance | Decorative profiles and stamped parts |
| H32 | Strain-hardened and stabilized | Good corrosion resistance and moderate forming | 5052 structural decorative applications |
| H34 | Higher-strength stabilized temper | More rigid, suitable for controlled bends | Durable exterior components |
Chemical Composition Reference
Chemical composition is controlled according to the selected alloy specification. The values shown are common maximum or nominal limits in percent by weight; final mill certification should govern purchase requirements.
| Alloy | Si | Fe | Cu | Mn | Mg | Cr | Zn | Al |
|---|---|---|---|---|---|---|---|---|
| AA 1050 | 0.25 | 0.40 | 0.05 | 0.05 | 0.05 | - | 0.05 | Balance |
| AA 1060 | 0.25 | 0.35 | 0.05 | 0.03 | 0.03 | - | 0.05 | Balance |
| AA 1100 | 0.95 Si + Fe | - | 0.05-0.20 | 0.05 | - | - | 0.10 | Balance |
| AA 3003 | 0.60 | 0.70 | 0.05-0.20 | 1.0-1.5 | - | - | 0.10 | Balance |
| AA 3105 | 0.60 | 0.70 | 0.30 | 0.30-0.80 | 0.20-0.80 | 0.20 | 0.40 | Balance |
| AA 5052 | 0.25 | 0.40 | 0.10 | 0.10 | 2.2-2.8 | 0.15-0.35 | 0.10 | Balance |
Technical Specifications
Brush colors coated aluminium strips can be tailored to width, thickness, coil weight, color, coating thickness, and packaging requirements. Narrow slit coils are commonly used for roll-formed trim and stamped accessories, while wider coils serve panel and cladding production.
| Property | Standard Supply Range | Customization Notes |
|---|---|---|
| Thickness | 0.20-1.50 mm | Heavier gauges available for special projects |
| Width | 20-1,600 mm | Slit width tolerance agreed before production |
| Coil inner diameter | 150 mm, 300 mm, 405 mm, 508 mm | Selected to match customer equipment |
| Coil outer diameter | Up to approx. 1,800 mm | Depends on thickness and coil mass |
| Coil weight | 0.5-5.0 tonnes | Small coils available for compact lines |
| Front coating thickness | 15-35 μm | Higher build available for demanding exposure |
| Back coating thickness | 5-10 μm | Double-side decorative coating optional |
| Gloss range | 10-80 gloss units | Matte, satin, semi-gloss, and high-gloss options |
| Surface protection film | 30-80 μm | Recommended for fabrication and installation |
| Color tolerance | Subject to approved sample | RAL, Pantone, metallic, wood-like, and custom colors |
For projects requiring durable exterior performance, PVDF Coated Aluminum Strip options provide enhanced resistance to UV exposure, color fading, and chalking. PE coatings are frequently used for indoor furniture, ceiling, appliance, and light-duty decorative applications where economy and clean appearance are priorities.
Coating Systems and Performance
| Coating Type | Typical Coating Build | Recommended Environment | Performance Characteristics |
|---|---|---|---|
| PE polyester | 15-25 μm | Interior and mild outdoor use | Good appearance, forming ability, and economy |
| HDPE | 20-30 μm | Moderate outdoor exposure | Improved hardness and durability over standard PE |
| SMP | 20-30 μm | Roofing, cladding, exterior trim | Strong weather resistance and scratch performance |
| PVDF | 25-35 μm | Facades and high-UV locations | Excellent color retention and chemical resistance |
| Anti-scratch lacquer | 5-15 μm additional layer | Appliance and high-contact surfaces | Better abrasion resistance and handling protection |
Typical coating performance is evaluated through tests for adhesion, pencil hardness, impact resistance, bending, solvent resistance, gloss retention, salt spray behavior, and accelerated weathering. Actual results vary with alloy, coating formulation, film thickness, and exposure conditions.
| Test Item | Typical Requirement | Reference Method |
|---|---|---|
| Coating adhesion | No peeling after cross-hatch test | ASTM D3359 / ISO 2409 |
| Pencil hardness | HB to 2H, coating dependent | ASTM D3363 |
| T-bend | 0T-3T, alloy and temper dependent | EN 13523-7 |
| Impact resistance | No visible cracking at agreed impact level | ASTM D2794 / EN 13523-5 |
| Salt spray resistance | 500-1,000 hours or project requirement | ASTM B117 |
| Color consistency | Compared with approved standard panel | ASTM D2244 |
| Specular gloss | As agreed at 60° angle | ASTM D523 |
Applications Across Decorative Manufacturing
Brush colors coated aluminium strips are used where visual impact, low mass, corrosion protection, and efficient continuous processing are important. The material can replace heavier decorative metals in many applications while retaining a modern brushed-metal identity.
| Application Area | Typical Components | Preferred Features |
|---|---|---|
| Architecture | Edge trim, soffits, flashings, ceiling grids, facade details | Weather resistance, controlled color, low maintenance |
| Home appliances | Refrigerator trims, cooker hoods, control-panel frames | Brushed appearance, stain resistance, forming ability |
| Furniture | Cabinet edging, drawer profiles, display systems | Decorative flexibility and scratch-resistant finishes |
| Transportation | Interior trim, caravan fittings, trailer profiles | Light weight and corrosion resistance |
| Lighting | Lamp housings, reflector trims, linear light channels | Clean surface and consistent grain direction |
| Signage | Letter returns, frames, decorative bands | Color options and easy fabrication |
| Packaging and closures | Caps, bands, specialty containers | Fine appearance and coating adhesion |
Processing and Handling Guidance
Brushed coated strip should be processed with clean rollers, dies, and work surfaces to avoid transferring particles into the finish. Protective film is particularly useful during stamping, profiling, and installation, but it should be removed within the recommended storage period to prevent adhesive residue or difficult peel-off.
Bending radii should be matched to alloy, temper, thickness, and paint system. More formable tempers such as H14 or H24 are generally preferred for sharp-profile work. For best appearance, keep the brush grain direction consistent across adjoining parts. Avoid prolonged contact with wet packaging, alkaline cleaners, cement dust, copper, and dissimilar metals that may encourage staining or galvanic corrosion.
Implementation commonly follows ASTM B209 for aluminium sheet and strip, EN 485 for aluminium wrought products, EN 1396 for coil-coated aluminium, and applicable ASTM or ISO coating test methods. Project specifications may also require RoHS, REACH, fire-performance, or environmental compliance documentation.
Brush colors coated aluminium strips offer a practical route to premium metal styling, dependable coating protection, and high-speed fabrication. With the right alloy, temper, brush pattern, and paint system, they support durable results across building, appliance, transport, and interior decoration markets.
