GM Specifications for Anodizing Aluminum

General Motors Corp. (All Grades)
Specification
Coating Thickness
Coating
Weight
ADT
Remarks
4472M - Type A > 0.3 mil (7.5 µm)
> 20.0 g/m2
< 6.0
 Clear - Exterior
4472M - Type B > 0.6 mil (15.0 µm)
> 40.0 g/m2
< 6.0
 Sandocolor® - Exterior
4472M - Type C > 0.1 mil (2.5 µm)
> 6.0 g/m2
None
 Clear - Interior
4472M - Type D > 0.3 mil (7.5 µm)
> 20.0 g/m2
None
 Electrolytic Color- Interior
4472M - Type E > 0.3 mil (7.5 µm)
> 20.0 g/m2
< 6.0
 Clear or Electrolytic Color
Nondec/Functional
4472M - Type F > 0.3 mil (7.5 µm)
> 20.0 g/m2
No seal
 Clear or Electrolytic Color
Functional/Unsealed
Anodizing Quality Testing Methods
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