Mirror finish aluminium

Selecting the correct alloy is critical for performance. For lighting reflectors and decorative trims, the 1xxx series (e.g., 1050, 1060, 1070) is preferred due to its high purity (99%+) which allows for a reflectivity rate of over 85-95%. For structural applications like facade cladding or signage, the 3xxx or 5xxx series (e.g., 3003, 5052) is better because it offers higher tensile strength and superior corrosion resistance, though the reflectivity may be slightly lower than pure aluminum.

Buyers must focus on Total Reflectance (TR) and Diffuse Reflectance. High-end mirror aluminum should achieve a TR of 86% to 98% depending on the polishing or anodizing process. Additionally, check the anodic oxidation film thickness, which should typically be between 3μm to 10μm to ensure the surface is scratch-resistant and anti-fingerprint. Ensure the flatness tolerance is strictly controlled to avoid 'oil canning' or visual distortion in large-scale installations.

To ensure international market entry, verify that the products meet ASTM B209 (US) or EN 485/573 (EU) standards for aluminum sheets. For architectural use, SGS or Intertek fire rating certifications (Class A1/A2) are essential. Furthermore, ensure the supplier complies with RoHS and REACH standards to guarantee the absence of hazardous substances in the coating or treatment process.

The mirror surface is highly sensitive. Ensure the supplier applies double-layered PE protective films (70-100 microns thick) to prevent scratches during fabrication and transport. Request Salt Spray Test reports (typically 48h to 150h) to evaluate corrosion resistance, especially if the product will be used in humid or coastal environments. For outdoor use, confirm if the surface has a UV-resistant coating to prevent yellowing or loss of gloss over time.

The biggest risks are surface oxidation due to moisture (white rust) and physical deformation. You must mandate seaworthy packaging, including silica gel desiccant packets and waterproof kraft paper wrapping. The sheets should be placed on fumigated wooden pallets with edge protectors and tightly strapped to prevent shifting inside the container.

Always use the Secured Trading Service on Made-in-China.com to protect your payment until delivery is confirmed. When negotiating, specify the exact reflectivity percentage and thickness tolerance (+/- 0.02mm) in the Proforma Invoice (PI). Request a pre-shipment inspection (PSI) by a third party like SGS or BV to verify the surface quality and quantity before the final balance is paid.

Be aware of Anti-Dumping Duties (ADD) that some countries (like the US or EU) impose on Chinese aluminum products. Consult with a customs broker to check the HS Code (typically 7606) and applicable tariffs. For large volumes, FOB (Free On Board) is recommended so you have control over the freight forwarder and shipping costs, whereas CIF might be more convenient for first-time buyers but offers less transparency on local port charges.