Custom Color SMP Coated Prepainted Galvanized Steel Coil
Custom Color Prepainted Galvanized Steel Coil for Roofing & Building Applications
Prepainted galvanized steel coils are produced with Galvanized Steel Coil substrate for roofing systems. Witop provides reliable bulk supply.
Durable Color Coating System; Strong Corrosion Protection; Wide Color & Specification Options; Reliable Bulk Supply Support;Consistent Surface Finish;
Prepainted Galvanized Steel Coil Technical Sheet
| Prepainted Steel Coil | ||
| Standard | JIS G 3312, EN 10169, ASTM A755 | |
| Grade | CGCC/CGCH,DX51D/DX52D | |
| Color | Clientโs Sample Color or Any Ral Colorย (Down Load RAL Color Chart) | |
| Painting Brand | Nippon, Akzo-Nobel, KCC | |
| Top Side Paintingย Film | Primer | 5-10ฮผm |
| Top Coating | 10โ25ฮผm | |
| Back Side Paintingย Film | Primer | 5-10ฮผm |
| Top Coating | 10โ25ฮผm | |
| Surface Treatment | PVC Film, Wrinkle/Matt, Printed, Embossed | |
| Thickness | 0.12-3.00MM | |
| Width | 20-1250MM | |
| Zincย Coating | 40-275G/M2 | |
| Hardness | Softy,ย Semiย Hard, Full Hard, G550 | |
| Coilย Weight | 3-5MT/Coilย orย Customized | |
| Coil Inner Diameter | 508MM or 610MM | |
| Package | Standard Seaworthyย Exportingย Packing | |
| MOQ | 25MT | |
| Capacity | 12500MT/Month | |
| Transportย Type | Vessel Container, Vessel Bulkย ,Railway Container,Railway Wagon | |
| Loadingย Port | Tianjin,ย Qingdao, Ningbo, Shanghai and other port | |
Prepainted Galvanized Steel Coil Description
Prepainted Galvanized Steel Coil Description highlights color coated GI steel designed for roofing panels and wall cladding systems. As a professional manufacturer and bulk supplier, we provide coils with PE, SMP or PVDF coating, thickness from 0.12โ3.0mm and customizable widths.
Compared with galvanized steel coil, prepainted coils eliminate secondary painting processes and improve production efficiency. Widely used by roofing sheet factories, sandwich panel makers and distributors, our PPGI steel coil helps reduce maintenance costs, ensure consistent color finish and secure reliable long-term supply for construction projects.
Prepainted Galvanized Steel Coil Applications
Roofing Sheet Manufacturing
PPGI steel coil is primarily used for producing color coated roofing sheets. The prepainted surface eliminates additional painting processes and ensures consistent color finish in residential and commercial roofing systems.
Sandwich Panel Production
Prepainted galvanized coils are widely applied in insulated sandwich panels for warehouses, cold storage and prefabricated buildings, combining structural durability with aesthetic appearance.
Wall Cladding & Facade Systems
Due to its smooth surface and customizable RAL colors, PPGI coil is ideal for decorative wall cladding and exterior facade panels in commercial buildings.
Prefabricated & Modular Houses
Lightweight and easy to form, prepainted galvanized steel coil supports fast construction of modular housing and temporary structures.
Home Appliance Outer Panels
Selected PPGI grades are used for appliance panels such as washing machine or refrigerator exteriors where color consistency and surface quality are required.
Agricultural & Industrial Buildings
Color coated steel is suitable for barns, storage facilities and factory buildings needing weather resistance and visual uniformity.
Prepinted Galvanized Steel Process Flow Chart
1. Pay Off
2. Welder
3. Entry Looper
4. Oil Degreasing
5. Dry Section
6. Primer Coating
8. Refined Coating
9. Dry Baking
10. Looper
11. Cutting
12. Finshed Products
Packing Details Standard export package
3 layers of packing, inner side is anti-water craft paper, PVC plastic film is the middle and outer side covered by at least 0.45mm thick steel sheet,wrapped by minimum seven steel strapping strips with lock catch.
In particular, WITOP steel places desiccant on the coil inner core side and on both lateral sides of the coil for bulk transportation to ensure that coils are delivered to clients in good condition.
Package can be customized as client’s requirements.
FAQ โ Prepainted Galvanized Steel Coil (PPGI)
Prepainted galvanized steel coil (PPGI) is a steel product made by applying paint coatings to galvanized steel coils (GI). The galvanized steel base provides corrosion protection, while the paint coating enhances durability, appearance, and weather resistance.
PPGI steel coils are widely used in roofing sheet manufacturing, wall cladding panels, sandwich panel production, prefabricated buildings, household appliances, interior decoration panels, and industrial buildings or warehouses. It is a staple material in the construction and building materials industries.
PPGI uses galvanized steel as the base and is generally more cost-effective. PPGL uses Galvalume steel as the base, which provides better corrosion resistance and a longer service life in harsh environments.
Typical thickness ranges include:
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0.12 โ 0.25 mm for roofing sheet production
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0.30 โ 0.50 mm for standard roofing and wall panels
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0.50 โ 0.80 mm for industrial building panels
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0.80 โ 1.2 mm for structural decorative panels Custom thickness can be produced based on specific project requirements.
Common zinc coating weights include Z60 for indoor applications, Z80 โ Z120 for standard roofing, Z180 for outdoor construction, and Z275 for high corrosion resistance environments. The zinc coating is essential for improving corrosion protection and overall durability.
Common paint systems include:
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Polyester (PE): The most widely used and economical choice.
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SMP: Features improved weather resistance.
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HDP: Offers higher durability.
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PVDF: Provides excellent UV and corrosion resistance, often used for high-end projects.
PPGI steel coils are available in a wide range of RAL standard colors, including RAL 3003 (Red), RAL 5015 (Blue), RAL 6005 (Green), RAL 7016 (Dark grey), and RAL 9002 (Grey white). Custom colors can also be produced according to project specifications.
Standard coil widths include 914 mm for roofing sheets, 1000 mm for general sheet processing, 1200 mm for wall panels, and 1250 mm for construction panels. Custom widths can also be supplied.
Key advantages include good corrosion resistance, an attractive color appearance, and a lightweight profile. It is also easy to install, provides a cost-effective roofing solution, and has a wide application range in modern building materials.
Typical service life depends on the paint system:
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PE coating: 10โ15 years
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SMP coating: 15โ20 years
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PVDF coating: 20โ30 years Proper installation and maintenance can further extend the service life.
Major buyers include roofing sheet and sandwich panel manufacturers, construction companies, building material distributors, prefabricated building manufacturers, and steel structure contractors. Bulk orders usually range from 20 to 200 tons.
Common international standards include ASTM A755, ASTM A653, EN 10169, JIS G3312, and GB/T 12754. These standards define critical parameters like paint thickness, coating weight, and mechanical properties.
Yes. PPGI steel coils are commonly processed through roll forming machines to produce corrugated roofing sheets, trapezoidal sheets, and various other roofing profiles.
Standard export packaging includes waterproof paper protection, plastic film covering, a steel outer sheet protection shell, steel strapping, and wooden pallets or skids. Proper packaging prevents moisture damage and surface scratches during shipping.
Key factors include stable paint coating quality, accurate thickness tolerances, consistent color finishes, and reliable export packaging. Many buyers prioritize direct manufacturers with strong production capacity and extensive export experience.
