The aluminum coil has appropriate climate resistance, with general thickness of oxide film (three μ m) will not change color, corrode, oxidize or rust in indoor use for a long time. The aluminum coil with thickened oxide film (10 μ m) may be used outdoors, and may be uncovered to sunlight for a long term without discoloration.
https://aludepot.com/product/3105-aluminum-coil/
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