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

(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)

(To be continued)