International Organization for Standardization · 2018
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The international general-specifying standard for anodic oxidation coatings on aluminium and its alloys. Defines quality grades AA5, AA10, AA15, AA20, AA25 by minimum coating thickness in micrometres (e.g. AA25 = 25 μm minimum). Specifies sealing requirements, abrasion resistance, light-fastness for dyed coatings, and recommended test methods (cross-references ISO 2360 for thickness, ISO 2143 for sealing). The reference standard most-cited internationally outside the US (where MIL-A-8625 dominates) and India (where IS 1868 dominates).