Specifies a method for assessing the quality of sealed anodic coatings on aluminium and its alloys. The method depends on the measurement of the loss of mass after immersion in phosphoric-chromic acid solution. The method applies to anodic coatings meant for exposure to weather, where resistance to staining is important and for protective purposes in corrosive media. Does not apply to: anodic coatings that have been sealed only in dichromate solutions; hard-type anodic coatings which normally are not sealed; and anodic coatings that have undergone a treatment to render them hydrophobic.

BS EN 12373-6 : 1999

ISO 3210 : 2017 - Identical