Prepainted Galvanized Steel Coil (ppgi) is a high-performance steel product that combines the corrosion resistance of galvanized steel with a durable, pre-applied paint coating. Here’s a breakdown of its features and uses:

1.Composition & Manufacturing Process:

1. Base Material – Cold-rolled steel coil.

2. Galvanization – Coated with a layer of zinc (hot-dip galvanized or electro-galvanized) for rust protection.

3. Chemical Treatment – A passivation layer (e.g., chromate or phosphate) is applied to enhance paint adhesion.

4. Primer & Paint Coating – Multiple layers (primer, topcoat, and sometimes a backer coat) are applied via a continuous coil coating line, followed by baking for durability.

5. Protective Film – A removable plastic film may cover the surface to prevent scratches during transport.

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2.Key Features:

• Corrosion Resistance – Zinc layer protects against rust.

• Aesthetic Appeal – Available in various colors, gloss levels, and textures.

• Durability – Resistant to UV rays, weathering, and scratches.

• Formability – Can be bent, stamped, or rolled without cracking the paint.

• Cost-Effective – Pre-painting eliminates the need for post-fabrication painting.

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3.Common Applications:

• Roofing & Wall Cladding – Used in industrial, commercial, and residential buildings.

• Appliances – Refrigerators, washing machines, and air conditioners.

• Automotive Parts – Interior panels and trim components.

• HVAC Ducts & Electrical Enclosures – Combines protection with a finished look.

• Metal Furniture & Signage – Provides a decorative, long-lasting surface.

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4.Advantages Over Traditional Painted Steel:

✔ Uniform Coating – Factory-applied paint ensures consistent quality.
✔ Faster Installation – No on-site painting required.
✔ Eco-Friendly – Reduced VOC emissions compared to wet painting.

5.Standards & Grades:

Common standards include ASTM A755 (for prepainted steel) and EN 10169. Thickness typically ranges from 0.2mm to 1.5mm, with coatings measured in microns (e.g., 20-25μm paint layer).

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