Pre-Painted Galvanized & Galvalume Steel Coil (PPGI/PPGL)
Pre-painted galvanized (PPGI) and pre-painted galvalume (PPGL) steel coils are factory-coated products that combine a metallic substrate with a durable, decorative organic paint system for both protection and aesthetics.
Material
Pre-painted Carbon Steel with metallic substrate of Galvanized (GI) or Galvalume (AZ). Base steel grades include CQ, DQ, and HSLA.
Model
PPGI Coil, PPGL Coil
Size
Standard widths range from 600 mm to 1300 mm, with specific widths tailored for downstream profiling equipment.
Thickness
0.20 mm to 1.5 mm (including substrate and total coating).
Standard
ASTM A755/A755M, EN 10169, JIS G3312, GB/T 12754. Paint performance standards include AAMA 2603, 2604, 2605.
MOQ
15 Metric Tons per color.
Delivery Time
Standard lead time is 5 to 8 weeks from order confirmation, subject to color and specification.
Long Description
Pre-painted galvanized (PPGI) and pre-painted galvalume (PPGL) steel coils are manufactured through a continuous coil coating line. The process involves cleaning, chemical pre-treatment, and priming of a galvanized steel (zinc-coated) or galvalume steel (aluminum-zinc alloy coated) substrate, followed by the precise roller application of one or multiple layers of liquid paint, which is then cured in an oven. This integrated manufacturing creates a product with a uniform, high-quality painted finish that exhibits excellent color consistency, adhesion, and resistance to weathering, corrosion, and mechanical damage. The product eliminates the need for onsite painting, providing a cost-effective and environmentally friendly solution for applications requiring specific colors, gloss levels, and long-term durability in various exposure conditions.
Key Product Highlights
PPGI/PPGL coils combine the sacrificial corrosion protection of a metallic coating with the decorative and protective qualities of an organic paint system.
A wide range of paint systems is available, including polyester (PE), silicon-modified polyester (SMP), polyvinylidene fluoride (PVDF), and plastisol.
The product offers excellent color consistency, gloss retention, and resistance to chalking and fading.
It can be supplied with various surface textures, including smooth, embossed, or printed patterns.
The factory-applied coating ensures uniform film thickness, reduces VOC emissions, and speeds up construction and manufacturing timelines.
Product Advantages
The continuous coil coating process provides superior paint adhesion and consistency compared to post-fabrication painting.
A diverse color palette and finish selection allow for design flexibility and brand-specific aesthetic requirements.
Pre-painted coils are ready for fabrication, reducing production steps, on-site labor costs, and environmental impact.
The integrated paint system is formulated for specific environmental exposures, from mild interior to severe marine or industrial atmospheres.
Technical data sheets for both the substrate and paint system provide full performance specification and compliance documentation.
Industry Application
This coil is primarily used for manufacturing architectural roofing and wall panels, composite panels, garage doors, appliance cabinets, HVAC housings, interior ceilings, partitions, and various formed metal products.
Technical Specifications
| Parameter | Unit | Pre-Painted Galvanized (PPGI) | Pre-Painted Galvalume (PPGL) | Notes |
|---|---|---|---|---|
| Carbon Content (C) | % | ≤ 0.15 (CQ) | ≤ 0.15 (CQ) | Refers to base steel composition. |
| Manganese (Mn) | % | ≤ 0.60 (CQ) | ≤ 0.60 (CQ) | Refers to base steel composition. |
| Phosphorus (P) | % | ≤ 0.035 | ≤ 0.035 | Typical maximum for forming grades. |
| Sulfur (S) | % | ≤ 0.035 | ≤ 0.035 | Typical maximum for forming grades. |
| Tensile Strength | MPa | 270 – 550 | 270 – 550 | Depends on base steel grade. |
| Yield Strength | MPa | 140 – 550 | 140 – 550 | Depends on base steel grade. |
| Elongation | % | 22 – 40 | 22 – 40 | Minimum values for commercial quality base steel. |
| Hardness | HRB | 40 – 85 | 40 – 85 | Rockwell B scale; depends on base steel temper. |
| Thickness | mm | 0.20 – 1.5 | 0.20 – 1.5 | Total finished product thickness. |
| Width | mm | 600 – 1300 | 600 – 1300 | Standard range for coil coating lines. |
| Coil Weight | MT | 3 – 12 | 3 – 12 | Typical coil weight, varies with thickness. |
| Surface Treatment | – | Chemical Conversion Coating (Chromate/Non-Chrom) | Chemical Conversion Coating (Chromate/Non-Chrom) | Pre-treatment for paint adhesion and substrate protection. |
| Coating / Finish | – | Paint System (PE, SMP, PVDF, Plastisol) | Paint System (PE, SMP, PVDF, Plastisol) | Topcoat type defines durability and gloss. Metallic substrate differs. |
| Rolling Type | – | N/A | N/A | Parameter describes base metal production, not coil coating. |
| Standard Example | – | EN 10169 DX51D+Z275PE | EN 10169 DX51D+AZ150PE | Representative standard showing substrate and paint system. |
Packaging & Surface Treatment
Coils are packaged with extreme care to prevent damage to the painted surface. Standard packaging involves winding on a cardboard or plastic core, interleaving with protective plastic or paper between coil layers, wrapping with waterproof and scratch-resistant film, and securing on wooden cradles with edge guards. Special surface protection films are often applied to the top side for critical architectural applications. The finish is the cured paint system, supplied in a range of gloss levels and textures.
Aliases Names
Color Coated Coil, Prepainted Steel Coil, Coil Coated Steel, Painted Galvanized Coil, Painted Aluzinc Coil.
