Prepainted Galvanized Steel Coil

Prepainted galvanized steel coil (PPGI) is a steel product created by applying one or more layers of coating on the surface of galvanized steel after surface treatment, then curing it to improve corrosion resistance and decorative appeal. It has a smooth, flat surface with multiple color options and is suitable for various processing methods such as bending, stamping, and forming.

As a versatile raw material, prepainted galvanized steel coil is widely used in various downstream industries. Its continuous coil form, uniform coating, and excellent processability make it perfect for applications that require in-house forming or custom cutting before installation.

Zhaojian is a trusted supplier of prepainted galvanized steel coils, offering a wide range of thicknesses and coating systems that meet international standards such as ASTM and JIS. Our PPGI coils provide dependable durability while complying with environmental standards.

Product Specifications

Item	Specifications
Base Metal	Hot-dip Galvanized Steel (GI)
Steel Grade	DX51D, DX52D, SGCC, ASTM A653
Thickness	0.12 mm – 1.2 mm
Width	600 mm – 1250 mm
Coating Type	PE (Polyester), SMP (Silicon Modified Polyester), PVDF (Fluorocarbon)
Paint Thickness	Top: 10–25 μm / Back: 5–15 μm
Zinc Coating Weight	Z40 – Z275 (g/m²)
Surface Finish	Regular spangle, zero spangle, chromated or non-chromated
Color Options	RAL standard colors or customized
Paint Adhesion	≥1T bend, no cracking or peeling
Coil Weight	3 – 8 tons (customizable)
Coil Inner Diameter	508 mm / 610 mm
Standards	ASTM A755/A755M, JIS G3312, EN 10169

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Advantages

Stable production process and uniform coating quality
Suitable for slitting, shearing, and roll forming
Export-grade packaging, rust- and moisture-resistant
Ideal for OEM manufacturers and secondary processors
Excellent corrosion resistance with dual protection from zinc and topcoat

Applications

Building and Decorative Materials: Used for producing roofing panels, wall cladding, ceiling systems, and cold-formed sections like C/Z purlins.

OEM Appliances: Used in manufacturing outer casings for air conditioners, refrigerators, water heaters, and ducting systems.

Automotive and Transportation: Commonly used for vehicle bodies, trailers, containers, and agricultural machinery due to its corrosion resistance and broad color choices.

Buyer’s Guide

Recommended Coating & Zinc Layer Thickness

Top coat: 15–25μm Back coat: 5–10μm

Zinc layer: ≥ Z275 (G90) for improved corrosion resistance

Ensures long-term durability, color retention, and edge protection

Packaging, Storage & Installation Tips

Use waterproof wrapping, edge protection, and steel strapping

Store in dry, ventilated areas to prevent wet storage stains

During installation: remove metal chips, use compatible fasteners, and seal cut edges

At Zhaojian Steel, each prepainted galvanized coil undergoes a rigorous multi-step coating process, including degreasing, chemical pretreatment, high-adhesion priming, and precise top coating—followed by controlled curing.

This guarantees a flawless finish, excellent paint adhesion, and long-lasting protection against UV, corrosion, and peeling. Whether for outdoor roofing or appliance panels, you can rely on the coating to endure.

PPGI vs. PPGL – What's the Difference?

Feature	PPGI (Galvanized)	PPGL (Galvalume)
Base Metal	Zinc coated	Zinc-Aluminum coated
Corrosion Resistance	Good	Excellent (2–3× longer)
Surface	Smooth, paintable	Slight spangle, shiny
Ideal For	General use	Coastal/high humidity areas

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Prepainted Galvanized Steel Coil