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Help CenterSteel Coil & Strip & Prepainted Galvanized Coil，ASTM A755、EN 10169、JIS G3312、JIS G3322、ISO 9001
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1. Product Overview
Color Coated Steel Coil, abbreviated as PPGI (Prepainted Galvanized Coil) and PPGL (Prepainted Galvalume Coil), takes cold rolled coil, hot-dip galvanized coil, galvalume coil or Zn-Al-Mg coil as substrate. It undergoes continuous degreasing & cleaning, chemical passivation pretreatment, double-side roller coating of organic paint and high-temperature baking & curing to form pre-painted metal coils.
Combining high tensile toughness of steel and anti-corrosion & decorative performance of organic coating, the finished coil is equipped with complete color protective paint film without secondary on-site painting. It features rich colors, excellent weather & corrosion resistance and outstanding bending & roll forming performance, serving as mainstream enclosure & decorative raw materials for steel structure buildings, home appliances, photovoltaic and container industries.
Composite Anti-Corrosion Structure Principle
5-layer full protective system: Metal substrate → Alloy anti-corrosion coating → Chemical conversion passivation film → Primer layer → Topcoat layer.The bottom zinc/aluminum-zinc alloy provides sacrificial anode anti-rust protection; passivation film improves coating adhesion; primer blocks water vapor penetration; topcoat isolates UV ray, acid rain and salt fog erosion. Multi-layer composite greatly extends outdoor service life and effectively prevents steel rusting, color fading and chalking.
2. Substrate Types, Steel Grades & Applicable Working Conditions
2.1 Hot-Dip Galvanized Substrate PPGI (Mainstream Product)
Grades: DX51D+Z, DX52D+Z, DX53D+Z, S220GD, S250GD, S350GD, S550GDZinc coating weight: Z40~Z275g/㎡Application: Ordinary workshops, warehouses, fences, prefab houses, indoor home appliance shells with highest cost performance.
2.2 Galvalume Substrate PPGL (High Weather Resistance)
Grades: DX51D+AZ, DX52D+AZ, S350GD+AZ, coating with 55%Al+43.5%Zn+1.5%SiApplication: Coastal high salt fog areas, high-temperature workshops, photovoltaic supports, long-term outdoor buildings, service life over 1.5 times of ordinary galvanized substrate.
2.3 Zn-Al-Mg Substrate ZM (Heavy-Duty Anti-Corrosion Premium Grade)
DX51D+ZM, ternary alloy coating of Al, Zn, Mg with self-healing cut edges, superior salt fog & acid rain resistanceApplication: Chemical plants, coastal heavy corrosion zones, livestock breeding workshops.
2.4 Cold Rolled Substrate CRC (Indoor Only)
SPCC, DC01 without galvanized layer, only for dry indoor short-term use, indoor decoration & small home appliance inner liners.
3. Main Topcoat Coating Systems (Classified by Weather Resistance Grade)
PE Polyester (Standard Polyester)Total top film thickness ≥20μm, back coat ≥8μm; weather resistance 5–8 years; cost-effective for general factories.
SMP Silicon Modified PolyesterWeather resistance 8–12 years; superior UV & chalking resistance for rainy & windy area roof & wall panels.
HDP High Durability PolyesterWeather resistance 12–18 years; anti-fading & acid rain performance for commercial stadiums, high-rise facades & photovoltaic roofs.
PVDF Polyvinylidene FluorideWeather resistance 20–30 years; stable C-F chemical bond, ultra-strong UV & chemical corrosion resistance for coastal & chemical factory high-end buildings.
Surface Texture Types
High gloss, matt, orange peel texture, embossed pattern, film-laminated color coated coil (PVC film attached on surface to prevent scratch)
4. Applicable Standard System
Domestic Chinese Standards
GB/T 12754-2019 Color coated steel sheets and stripsGB/T 17395 Steel tubes — Dimensions, shapes, masses and tolerancesGB/T 2518 Continuously hot-dip galvanized steel sheets and stripsGB/T 14978 Continuously hot-dip aluminum-zinc alloy coated steel sheets and strips
International Export Standards
ASTM A755, EN 10169, JIS G3312, JIS G3322, ISO 9001
5. Complete Specification Parameters
Thickness Range: 0.12mm–1.5mm, regular stock 0.3–1.2mm; customized ultra-thin 0.12–0.3mm & heavy gauge 1.2–1.5mm available
Standard Width: 900mm, 1000mm, 1200mm, 1250mm, 1500mm; slitted narrow strips 30–900mm on request
Coil Inner Diameter: Standard 508mm (20 inch), 610mm (24 inch)
Single Coil Weight: Regular 3–10 tons, split small coils 2–5 tons available
Standard Coating ThicknessFront side: primer 5–8μm + topcoat 15–25μm, total 20–35μm; back protective paint 7–15μm
Color SystemFull RAL color chart series (red, blue, white, grey, green, beige, black etc.), custom special colors, metallic colors & wood grain colors supported by color samples
Further Processing FormsWhole coil, leveled color coated sheets, slitted narrow strips, roll-formed tiles, bent decorative parts, cut & stamped components
Dimensional Tolerance Control
Thickness tolerance ±0.02mm; width tolerance 0~+2mm; strict control on flatness, camber and coil telescoping, no paint cracking & peeling after bending.
6. Complete Continuous Production Process
Uncoiling of cold rolled / galvanized substrate → Degreasing & washing → Pure water rinsing → Chemical passivation conversion treatment → Drying → Front side primer roller coating → Baking & curing → Front side topcoat roller coating → High-temperature curing & cooling → Back side back coat roller coating → Secondary baking → Surface film lamination (optional) → Tension coiling → Coil marking & coding → Finished product inspection → Strapping & warehousing
7. Mandatory Batch Inspection Standards (Sampling Test Per Batch)
7.1 Mechanical & Coating Performance Tests
Tensile test: Yield strength, tensile strength, elongation after fracture, classified into CQ commercial grade, FH forming grade and high-strength structural grade
180° T-bend test: No paint cracking or peeling at T0–T3, suitable for roll forming & bending
Film thickness test: Random inspection of coating thickness to guarantee weather & anti-corrosion service life
Cross-hatch adhesion test: No paint peeling, firm bonding between coating and substrate
Salt spray test: PE ≥500h, HDP ≥1000h, PVDF ≥3000h without red rust
UV aging test: Simulate outdoor exposure to test color fading and chalking grade
7.2 Appearance & Dimensional Inspection
Uniform paint film free of missing coating, sagging, bubbles, scratches, roll marks and color difference; neat coil shape without loose winding or telescoping; thickness, width and coil weight checked & recorded coil by coil.
7.3 Impact Resistance Test
No paint peeling after front impact, protecting surface from collision scratch during transportation and installation.
8. Core Product Advantages
Pre-finished color coating, eliminate on-site painting proceduresComplete uniform paint film delivered, no rust removal or painting required on construction site, greatly shorten project period and cut labor cost.
Multi-layer composite anti-corrosion, long outdoor service lifeDual protection of substrate alloy coating & multi-layer organic coating, matching inland, windy, coastal and chemical corrosive environments with different coating systems.
Rich colors with strong decorative effectThousands of standard RAL colors available, multiple textures including matt & high gloss, unified beautiful building appearance.
Excellent formability without paint peeling after shapingSpecial passivation & industrial topcoat ensures no cracking or peeling during bending, roll forming, punching and shearing, compatible with all tile pressing and sheet metal equipment.
Light weight & high strength to reduce steel structure loadMuch lighter than concrete and tiles under same enclosure area, lower load bearing requirement for factories and save structural steel consumption.
Eco-friendly & recyclable with easy maintenance100% recyclable steel material; compact waterproof & dustproof surface, only clean with fresh water daily without scale & rust accumulation.
9. Main Application Fields
Construction Industry (Core Application)Roof & wall panels for industrial workshops, warehouses, logistics parks, prefab houses, clean rooms, stadiums, airport terminals, fences, canopies and ceiling decorative sheets.
Photovoltaic New EnergyPV roof color steel tiles, photovoltaic support enclosures, energy storage equipment shells.
Home Appliance ManufacturingRefrigerator, air conditioner, washing machine, microwave oven shells, electric distribution boxes, metal furniture cabinets.
Transportation IndustryContainer side panels, truck carriage plates, highway noise barriers, simple ship interior sheets.
Livestock & AgricultureBreeding sheds, greenhouse enclosures, grain silos, feed equipment shells.
General Sheet Metal DecorationStorefront decoration, advertising billboards, pipeline outer cladding, small equipment shells.
10. Packaging, Loading Port & Lead Time
Standard Export Seaworthy PackagingSteel guard rings fitted on inner & outer coil circles, cross strapping with steel bands for reinforcement; inner layer wrapped with VCI volatile anti-rust paper, outer layer fully covered with blue waterproof woven cloth; paper tube inside coil core to avoid deformation, plastic end guards to prevent collision scratch on paint film.
Loading Port: Tianjin Port, shipment available via Qingdao Port and Shanghai Port.
Lead Time
Regular stock PE polyester RAL color coated coils: 5–7 days
SMP/HDP high weather resistance & PPGL galvalume coils: 8–12 days
PVDF fluorocarbon, Zn-Al-Mg ZM, custom special color / embossed & film-laminated coils: 15–22 days
MOQ & SamplesMinimum order quantity 5 tons; 30cm test samples provided free for salt spray, T-bend and adhesion tests.
11. Supporting Quality Assurance Documents
Complete set of original Chinese & English factory certificates:
Substrate chemical composition analysis report
Mechanical test report (tensile, T-bend, coating adhesion)
Film thickness, salt spray & UV aging test data sheet
Surface appearance inspection record
GB/ASTM/JIS factory certificate, packing list, certificate of origin, SGS third-party test report
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