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#097 Alumite Classification according to JIS Standards: Anodic Oxide Films on AL and AL Alloys - 1

Category : Anodizing
October 7, 2011

JIS standards specify anodic oxide films on aluminum and its alloys as follows:

(1) Classification of anodic oxide films

Table 1 shows the classification of anodic oxide films by film thickness. "AA" stands for an alumite film on an aluminum material, and the numeral suffixes indicate the film thickness:

[Table 1] Classification of anodic oxide films
Type Main applications
(for reference)
AA3 Reflectors, parts (interior parts) for home electronic appliances, etc.
AA6, AA10 Kitchenware, daily appliances, parts for home electronic appliances, ornaments, vehicle interior parts, building materials (for interior uses), etc.
AA15, AA20, AA25 Kitchenware, vehicle exterior parts, civil engineering and building materials (for exterior uses), vessel equipment, etc.

(2) Test items by use

Table 2 lists the test items required for anodic oxide films by use. When an anodic oxide film does not fall into a single category of use, the test items required for the anodic oxide film shall be determined by agreement between the interested parties.

[Table 2] Test items by usage environment (marked with as applicable)

(3) Film thickness ranges

Table 3 shows the allowable film thickness ranges determined from microscopic coating thickness measurements, the eddy current method, the split beam method, and the coating mass measuring method. Any film with a thickness less than 80 percent of the lower limit of the applicable value range shall be rejected.

[Table 3] Film thickness ranges (μm)
Type AA3 AA6 AA10 AA15 AA20 AA25
Mean film thickness 3.0 or more 6.0 or more 10.0 or more 15.0 or more 20.0 or more 25.0 or more

(To be continued)

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