Contact Platform Support
Help CenterSteel Coil & Strip & Color Coated Steel Coil，1000/1200/1250/1500mm
Related Products
-
Steel Coil & Strip & Color Coated Steel Coil，1000/1200/1250/1500mmNegotiableMOQ: 5 Metric Tons -
Steel Coil & Strip & Color Coated Steel Coil，1000/1200/1250/1500mmNegotiableMOQ: 5 Metric Tons
-
Steel Coil & Strip & Cold-Rolled Steel Coil，DP590/780/980、QP980、DC01、DC04、DC06NegotiableMOQ: 5 Metric Tons
-
Steel Coil & Strip & Cold-Rolled Steel Coil，DP590/780/980、QP980、DC01、DC04、DC06NegotiableMOQ: 5 Metric Tons
-
Steel Coil & Strip & Cold-Rolled Steel Coil，DP590/780/980、QP980、DC01、DC04、DC06NegotiableMOQ: 5 Metric Tons
Pre-painted Steel Coil Product Detailed Description
Pre-painted steel coil (also known as color steel coil, PPGI / PPGL) is a composite material made by chemical pretreatment, roller coating with organic paint, and high-temperature baking curing on the surface of hot-dip galvanized / galvalume / electro-galvanized steel substrate. It combines the structural strength of steel with anti-corrosion, weather resistance and decorative properties of paint. It can be directly processed and is a core material for construction, home appliances, new energy and other industries.
1. Core Structure (Five-layer Protection)
A standard pre-painted steel coil consists of five layers for comprehensive protection and longer service life:
Substrate: Provides mechanical strength and basic anti-corrosion performance; mainstream types are Hot-Dip Galvanized (GI) and Galvalume (GL, 55%Al+43.4%Zn+1.6%Si), with a small quantity of Electro-Galvanized (EG).
Chemical Conversion Layer: Passivation and chromate treatment to improve coating adhesion and enhance rust resistance.
Primer Layer: Epoxy / polyester primer for enhanced anti-corrosion and stable interlayer bonding.
Topcoat Layer: Determines color, gloss and weather resistance; common types include PE / SMP / HDP / PVDF.
Back Coat Layer: Protects the back side from corrosion and extends overall service life.
2. Substrate Types & Characteristics
| Substrate Type | Main Composition | Coating Weight | Corrosion Resistance | Application |
|---|---|---|---|---|
| Hot-Dip Galvanized (GI) | Pure Zinc | 80–275g/m² (double side) | Medium | Inland dry areas, ordinary industrial buildings, home appliances |
| Galvalume (GL) | 55%Al+43.4%Zn+1.6%Si | 100–150g/m² (double side) | 2–3 times of GI | Coastal areas, chemical industry and other high-corrosion environments |
| Electro-Galvanized (EG) | Pure Zinc | 20/20g/m² (double side) | Weak | Indoor home appliances, decoration; not recommended for outdoor use |
3. Main Coating Systems (Core of Weather Resistance & Cost)
3.1 Polyester (PE)
Service Life: 5–10 years
Features: Lowest cost, rich color options, excellent workability
Application: Ordinary factory buildings, warehouses, indoor home appliances, civil buildings
3.2 Silicon Modified Polyester (SMP)
Service Life: 10–15 years
Features: High hardness, anti-pollution, better weather resistance than PE
Application: Urban factory buildings, commercial buildings, outdoor enclosure panels
3.3 High Durability Polyester (HDP)
Service Life: 15–20 years
Features: Strong UV resistance, salt spray resistance, weather resistance close to PVDF
Application: High altitude & strong UV areas, high-end industrial buildings
3.4 Polyvinylidene Fluoride (PVDF)
Service Life: More than 20 years
Features: 70% PVDF + 30% acrylic, acid & alkali resistance, superior corrosion and weather resistance
Application: Coastal landmark buildings, high-pollution industrial zones, high-end curtain walls, cross-sea structural components
Reference Coating Thickness
Topcoat: PE/SMP 20–25μm; HDP/PVDF ≥25μm
Back Coat: 5–10μm
4. Standard Product Specifications
Thickness: 0.3–1.5mm (common: 0.4–0.8mm)
Width: 1000/1200/1250/1500mm
Coil Weight: 3–8 tons (customizable)
Color: Ocean Blue, Light Grey, Brick Red, Off-white, Ivory White, etc. (customizable)
Gloss: Low Gloss (≤30°), Medium Gloss (30°–60°), High Gloss (≥60°)
5. Core Performance Features
Light Weight & High Strength: Light self-weight with high structural strength, reducing structural load.
Anti-corrosion & Weather Resistant: Isolates corrosive media with long service life far exceeding ordinary steel plates.
Excellent Decoration: Rich colors and textures, permanent appearance without fading.
Good Processability: Suitable for shearing, bending, stamping and lock forming to match various processing technologies.
Economical & Eco-friendly: No later painting required, low maintenance cost, fully recyclable.
6. Main Application Fields
Construction (Primary): Roof & wall panels of industrial factories and warehouses, steel structure enclosure, curtain walls, roof tiles, construction hoardings.
Home Appliances: Shells of refrigerators, washing machines, air conditioners, microwave panels, home appliance side panels.
Transportation & Equipment: Rolling shutters, chassis and cabinets, light steel structural parts, municipal facilities.
New Energy: Photovoltaic brackets, energy storage equipment shells, wind power accessories.
Others: Advertising billboards, furniture, interior decorative panels.
7. Quality Inspection Key Points
Surface Condition: No missing coating, scratches, bubbles or color difference; uniform gloss.
Coating Adhesion: No cracking or peeling after 180° bending test.
Coating & Zinc Layer Thickness: Compliant with contract standards (e.g. zinc coating 120g/m², topcoat 25μm).
Salt Spray Resistance: PVDF ≥5000h, HDP ≥3000h, SMP ≥2000h, PE ≥1000h without rust spots.
8. Selection Suggestions & Delivery
Inland Ordinary Environment: Hot-dip galvanized substrate + PE/SMP coating, best cost performance.
Coastal / Chemical Industrial Zone: Galvalume substrate + HDP/PVDF coating, long-term anti-corrosion.
High Altitude / Strong UV Area: Galvalume substrate + HDP/PVDF coating, anti-fading performance.
Indoor / Home Appliance Use: Hot-dip / electro-galvanized substrate + PE coating, economical and practical.
Delivery Time: 5–7 days for conventional sizes, shipped from Tianjin Port.
Send Inquiry to This Supplier
You May Also Like
-
Steel Coil & Strip & Cold-Rolled Steel Coil，DP590/780/980、QP980、DC01、DC04、DC06NegotiableMOQ: 5 Metric Tons
-
Steel Coil & Strip & Cold-Rolled Steel Coil，DP590/780/980、QP980、DC01、DC04、DC06NegotiableMOQ: 5 Metric Tons
-
Steel Coil & Strip & Cold-Rolled Steel Coil，DP590/780/980、QP980、DC01、DC04、DC06NegotiableMOQ: 5 Metric Tons
-
Steel Coil & Strip & Cold-Rolled Steel Coil，DP590/780/980、QP980、DC01、DC04、DC06NegotiableMOQ: 5 Metric Tons
-
Steel Coil & Strip & Cold-Rolled Steel Coil，DP590/780/980、QP980、DC01、DC04、DC06NegotiableMOQ: 5 Metric Tons
-
Steel Coil & Strip & Cold-Rolled Steel Coil，DP590/780/980、QP980、DC01、DC04、DC06NegotiableMOQ: 5 Metric Tons
-
Steel Coil & Strip & Cold-Rolled Steel Coil，DP590/780/980、QP980、DC01、DC04、DC06NegotiableMOQ: 5 Metric Tons
-
Steel Coil & Strip & Hot Rolled Steel Coil，EN 10025、ASTM A36/A572、JIS G3101NegotiableMOQ: 5 Metric Tons
-
Steel Coil & Strip & Hot Rolled Steel Coil，EN 10025、ASTM A36/A572、JIS G3101NegotiableMOQ: 5 Metric Tons
-
Steel Coil & Strip & Hot Rolled Steel Coil，EN 10025、ASTM A36/A572、JIS G3101NegotiableMOQ: 5 Metric Tons
