2025-04-11
1. Substrate quality High quality colour coated aluminium coils are usually made from aluminium of higher purity or specific aluminium alloys as the substrate. Material and alloy selection Purity and alloy type: Prefer high purity aluminium (e.g. 1-series pure aluminium) or corrosion-resistant alloys (e.g. 3-series aluminium-manganese alloy, 5-series aluminium-magnesium alloy). 3003/3105 (manganese-containing) is suitable for conventional architectural shading, while 5052/5754 (magnesium-containing) is more corrosion-resistant and is suitable for coastal or high humidity environments. Thickness uniformity: The thickness of the substrate is uniform and the tolerance is controlled within a small range. For example, the common architectural colour coated aluminium coil thickness tolerance is generally controlled within ± 0.05mm,