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INCH-POUND MIL-DTL-81706B 25 October 2004 SUPERSEDING MIL-DTL-81706A 18 February 2002 DETAIL SPECIFICATION CHEMICAL CONVERSION MATERIALS FOR COATING ALUMINUM AND ALUMINUM ALLOYS This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers chemical conversion materials used in the formation of coatings by the reaction of the material with the surfaces of aluminum and aluminum alloys. 1.2 Classification. The chemical conversion materials and application methods are of the following types, classes, material forms, and methods. 1.2.1. Types. The chemical conversion materials are of the following types (see 6.2). Type I – Compositions containing hexavalent chromium.