Military Specifications for Anodizing Aluminum

Military Class I - Clear Military Class II - Color
Specification	Coating Thickness	Coating Weight	ADT	Remarks
MIL-A-8625F Type I & IB				Chromic acid anodizing
MIL-A-8625F Type IC	> 0.02 mil (0.5 µm)	> 200 mg/ft²	None	Clear or Color
MIL-A-8625F Type II	> 0.1 mil (2.5 µm)	> 1000 mg/ft²	None	Clear or Color
MIL-A-8625F Type IIB	0.02-0.7 mil (0.5-18 µm)	> 200 mg/ft²	None	Clear or Color
MIL-A-8625F Type III				Hardcoat
MIL-STD-171D Finish 7.2.1	> 0.1 mil (2.5 µm)	> 1000 mg/ft²	None	Clear - Use Spec MIL-A-8625 Type II
MIL-STD-171D Finish 7.2.2	> 0.1 mil (2.5 µm)	> 1000 mg/ft²	None	Color - Use Spec MIL-A-8625 Type II

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