What Is Prepainted Galvanized Steel Coil
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:
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Base Material – Cold-rolled steel coil.
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Galvanization – Coated with a layer of zinc (hot-dip galvanized or electro-galvanized) for rust protection.
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Chemical Treatment – A passivation layer (e.g., chromate or phosphate) is applied to enhance paint adhesion.
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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.
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Protective Film – A removable plastic film may cover the surface to prevent scratches during transport.
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2.Key Features:
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Corrosion Resistance – Zinc layer protects against rust.
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Aesthetic Appeal – Available in various colors, gloss levels, and textures.
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Durability – Resistant to UV rays, weathering, and scratches.
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Formability – Can be bent, stamped, or rolled without cracking the paint.
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Cost-Effective – Pre-painting eliminates the need for post-fabrication painting.
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3.Common Applications:
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Roofing & Wall Cladding – Used in industrial, commercial, and residential buildings.
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Appliances – Refrigerators, washing machines, and air conditioners.
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Automotive Parts – Interior panels and trim components.
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HVAC Ducts & Electrical Enclosures – Combines protection with a finished look.
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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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