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| Specification | Common Range | What It Affects |
|---|---|---|
| Substrate thickness | 0.2–1.2 mm | Strength, weight, formability |
| Coil width | 700–1250 mm | Coverage, material utilization |
| Coating thickness | Primer 5–7 μm; topcoat 20–25 μm | Corrosion resistance, appearance |
| Application | Recommended Substrate Thickness | Recommended Coating | Key Requirements |
|---|---|---|---|
| Building roofing | 0.4–0.8 mm | SMP, HDP, or PVDF | Weather resistance, load capacity |
| Wall cladding | 0.35–0.6 mm | PE or SMP | Appearance, formability |
| Home appliance panels | 0.3–0.6 mm | PE or HDP | Surface quality, paint adhesion |
| HVAC ducting | 0.5–1.0 mm | PE | Formability, corrosion resistance |
| Container panels | 0.8–1.2 mm | HDP or PVDF | Impact resistance, corrosion resistance |
A thicker substrate does not automatically mean a better product. If the zinc coating is too thin or the paint adhesion is poor, a thick sheet can still fail early. Buyers should evaluate all three specifications together.
Specification selection is a balance between structural requirements, service environment, and cost. Understanding the common ranges helps buyers communicate their needs clearly and avoid over- or under-specifying.
