TT-C-490F
Method IV - Emulsion cleaning, with or without added water. Method V - Derusting by chemical means.
Method VI - Phosphoric acid cleaner (detergent or solvent-type with detergent). Method VII - Steam cleaning, with or without assisted pressure washing.
1.2.1.1 Ozone depleting chemicals. To comply with the Clean Air Act regulations, materials can not contain class I or class II ozone depleting substances.
1.2.2 Conversion coatings, pretreatments, and pre-primer coatings. Chemical conversion and pretreatment coatings will be furnished in the following types (see 6.2).
Type I - Zinc phosphate.
Type II - Aqueous iron phosphate. Type III - Organic pretreatment. Type IV - Inorganic pretreatment.
Type V - Medium weight zinc phosphate.
Type VI - MIL-DTL-5541, Chemical Conversion Coatings on Aluminum and
Aluminum Alloys.
Type VII - Anodic coating and electrolytic passivation. Type VIII - Metal-rich coating for abrasive blasted surfaces.
1.2.2.1 Method of application. New design documents, engineering drawings and ordering data should indicate the type of coating required and method of application when applicable.
1.2.3 Metal classes. Each of the aforementioned types may have materials that are appropriate for multiple metals qualification. In order to systematize the listing of products qualified to this specification found in the Qualified Products Database (QPD), a class will be assigned to each metal type.
Class A - Steel alloys consisting mostly of iron other than corrosion resistant steel alloys which would be classified under class C.
Class B - Aluminum alloys.
Class C - Other alloys, multi-metal combinations of steel and aluminum or applications for other metallic substrates as required by the
manufacturer and where approved by the Army Research Laboratory (ARL)
during the qualification process.
2. APPLICABLE DOCUMENTS
2.1 Government publications. The issues of the following documents, in effect on the date of
invitation for bids or request for proposal, form a part of this specification to the extent specified herein.
FEDERAL STANDARDS
FED-STD 313 - Material Safety Data, Transportation Data, And Disposal Data
For Hazardous Materials Furnished To Government Activities.
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