A: The core is a pure aluminum sheet (typically 1000 or 3000 series aluminum alloy) used as the top skin, polished to a mirror finish through precision grinding and electrolytic or mechanical polishing (very low Ra value). Then, a transparent protective coating (usually PVDF or acrylic) is applied over it. This transparent layer protects the underlying aluminum mirror from corrosion and scratches while maximizing its reflectivity.
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