Prepainted Aluminium Coils (PPAL)
Prepainted Aluminium Coils (PPAL) are colour-coated aluminium coils manufactured for roofing, cladding, sandwich panels, ACP, ceilings, gutters and other architectural and industrial applications. PPAL combines the lightweight and corrosion-resistant properties of aluminium with a durable factory-applied paint finish.
PPAL Coil Specifications
| Specification | Available Range |
|---|---|
| Standard | ASTM B209 / EN / International Standards |
| Alloys | 1100, 3003, 3004, 3005, 3105, 5005, 5052 and others |
| Temper | H14, H16, H24, H26, H46, H48 and as required |
| Thickness | 0.20–1.20 mm |
| Width | Up to 1,350 mm |
| Coil ID | 508 mm standard; 610 mm optional |
| Coil OD | Up to 1,800 mm |
| Coating | PE, SMP, PVDF, Epoxy and other systems |
| Colours | RAL and customised colours |
PPAL Coil Applications
Prepainted aluminium coils are widely used for:
- Roofing & wall cladding
- Curtain wall systems
- Sandwich panels
- Aluminium Composite Panels (ACP)
- Ceiling systems
- Roller shutters
- Gutters & rainwater systems
- HVAC and architectural applications
- Home appliances
- Signage and decorative panels
PPAL Paint & Coating Systems
Depending on the application, PPAL coils can be supplied with PE (Polyester), SMP, PVDF, Epoxy and high-durability coating systems. PVDF-coated aluminium is commonly selected for demanding exterior architectural applications requiring enhanced colour retention and weather resistance.
Prepainted Aluminium Coil Supplier in UAE
PPAL coils can be supplied in customised alloy, temper, thickness, width, coating, colour and coil-weight specifications for customers across the UAE and GCC, including Saudi Arabia, Qatar, Oman, Kuwait and Bahrain.
SRK Steel supplies prepainted aluminium coils in the UAE and GCC for roofing, cladding, ACP, sandwich panels and architectural applications, with PE, PVDF and other coating systems available subject to the required specification.
Specifications – Prepainted Aluminium Coils (PPAL)
PPAL Coil Quality Standards & Testing
Prepainted Aluminium Coils (PPAL) are manufactured by continuously coating mill-finish aluminium coils with the specified primer and topcoat system. Factory quality control and coating performance are verified through relevant mechanical, paint and surface tests according to the applicable product specification.
Quality Tests for Prepainted Aluminium Coils
| Test | Purpose |
|---|---|
| Colour | Verifies colour consistency and RAL shade |
| Gloss | Checks surface gloss level and finish |
| Dry Film Thickness | Measures paint coating thickness |
| T-Bend Test | Evaluates coating flexibility during forming |
| Mandrel Bend Test | Checks coating performance during bending |
| Cross-Hatch Adhesion | Evaluates paint adhesion to the aluminium substrate |
| Pencil Hardness | Measures surface hardness and scratch resistance |
| Solvent Resistance | Checks coating resistance to solvents |
| Salt Spray Test | Evaluates corrosion resistance |
| Chalk Resistance | Assesses coating resistance to surface chalking |
PPAL coils can be supplied with PE, SMP, PVDF and other coating systems, with specifications tailored to roofing, cladding, ACP, sandwich panels and architectural applications in the UAE and GCC.
COATING COMPARISON
Prepainted Coil Coating Comparison: PVDF vs HDP vs PUPA vs SMP
| S.N. | Properties | PVDF | High Durable Polyester (HDP) | PUPA | Silicon Modified Polyester (SMP) |
|---|---|---|---|---|---|
| 1 | Colour Range | Good Range | Excellent Range | Good Range | |
| 2 | Durability | Outstanding | Excellent | ||
| 3 | Heat Resistance | Good–Excellent | Good | Excellent | Good–Excellent |
| 4 | Abrasion Resistance | Good | Excellent | Good | |
| 5 | Gloss Retention | Excellent | Good | ||
| 6 | Cupping / Formability | 6 mm | |||
| 7 | Pencil Hardness | F–HB | H | ||
| 8 | Cross-Hatch Adhesion | 100% Pass | |||
| 9 | Salt Spray Resistance | 2,000 hrs | 1,000 hrs | ||
| 10 | Warranty | 15–20 Years | 10–15 Years | 15 Years | 5 Years |
| 11 | UV Resistance | Excellent | Good | ||
| 12 | MEK Double Rub | Good | |||
| 13 | Impact Resistance | Good | |||
| 14 | T-Bend | 0T / 1T | 1T / 2T | ||
| 15 | Film Characteristics | Soft | Soft / Hard | Hard | |
| 16 | QUV-B Performance | Excellent | Good–Excellent | Poor / Good | |
Prepainted Coil Coating Types: PVDF, High Durable Polyester, PUPA & SMP
The performance of prepainted metal coils depends significantly on the organic coating system applied to the substrate. Different coating systems offer different levels of UV resistance, corrosion protection, colour retention, gloss retention, flexibility, hardness, abrasion resistance and weather durability.
Common coating systems for prepainted metal coils include PVDF, High Durable Polyester (HDP), PUPA and Silicon Modified Polyester (SMP). The appropriate system should be selected according to the building application, environmental exposure, forming requirements, required service life and project specification.
