Thickness Information
Standard national-spec thicknesses commonly used for exterior walls and roofing (excluding the coating layer)—classified based on the thickness of the base substrate (excluding the coating layer)—are as follows:
- Single-layer sheets: 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm (most commonly used), 0.6 mm.
I. Common thicknesses for wall panels:
- 0.35 mm, 0.40 mm, 0.45 mm, 0.50 mm (most commonly used).
II. Common thicknesses for roofing panels:
- 0.40 mm, 0.45 mm, 0.50 mm (standard configuration), 0.60 mm (commonly used in heavy-load or high-wind/snow regions).
III. Supplementary notes for export / frequently asked questions:
- International clients typically distinguish between: Nominal Thickness / Actual Thickness.
- Thicker options available: 0.7 mm, 0.8 mm (rarely used in standard industrial workshops).
What are the common types of coatings for color-coated steel sheets?
Span, height, crane requirements, and structural loads are the four core factors that determine the steel content required for a project; specifically, the larger the span, the greater the building height, the presence of cranes, or the more severe the wind and snow conditions → the higher the required steel content. The common coatings for color-coated steel sheets generally fall into these four major categories:
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PE (Polyester) Coating (Most Commonly Used)
- English: Polyester
- Features: Low cost, wide range of colors, excellent formability, high cost-performance ratio.
- Applications: Walls of standard factory buildings, interior spaces, general outdoor environments.
- Weather Resistance: Moderate (approx. 5–10 years).
-
SMP (Silicone Modified Polyester) (Moderately Priced)
- English: Silicone Modified Polyester
- Features: High hardness, abrasion resistance; superior weather resistance compared to PE.
- Applications: Roofing, walls requiring high surface hardness.
- Weather Resistance: Medium (approx. 10 years); superior to PE.
-
HDP (High Durability Polyester) (Performance Approaching PVDF, Lower Cost)
- English: High Durability Polyester
- Features: UV resistance, fade resistance, high cost-performance ratio.
- Applications: Commonly used for export markets, factory buildings requiring long-term outdoor durability.
- Weather Resistance: Good (15–20 years).
-
PVDF (Fluorocarbon) Coating
- English: PVDF / Fluorocarbon
- Features: Top-tier weather resistance, corrosion resistance, fade resistance, UV resistance.
- Applications: Coastal areas, chemical plants, high-end projects, long-term export applications.
- Weather Resistance: Extremely strong (20–30 years or more).
Simple Summary (Quick Reference for Client Inquiries)
- For standard, budget-friendly use: PE
- For standard export applications: HDP
- For high-end, corrosion-resistant use: PVDF
