TT-C-490G
9 September 2019 .
SUPERSEDING
TT-C-490F
w/AMENDMENT 4
20 July 2018
FEDERAL SPECIFICATION
CHEMICAL CONVERSION COATINGS AND PRETREATMENTS
FOR METALLIC SUBSTRATES (BASE FOR ORGANIC COATINGS)
The General Services Administration has authorized the use of this federal specification by all
federal agencies.
1. SCOPE AND CLASSIFICATION
1.1 Scope. This specification covers processes, pretreatments, and pre-primer surface
preparations of metallic substrates for coating applicators. It covers metal surface preparation for
delaying corrosion initiation and promoting primer adhesion. In addition, this specification
covers the testing requirements for qualification of conversion coatings, the pretreatments and
pre-primer coatings. Additional qualification requirements may be required based on each
specific application.
1.2 Classification. This specification covers the following cleaning methods, surface
preparation processes, and substrate classes (see 6.2).
AMSC N/A AREA MFFP
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
Beneficial comments, recommendations, additions, deletions, clarifications, etc. and any data that
may improve this document should be sent to: Director, CCDC Army Research Laboratory,
Weapons and Materials Research Directorate, CCDC ARL Specifications and Standards Office,
ATTN: FCDD-RLW-MC, Aberdeen Proving Ground, MD 21005-5069. Since contact
information can change, you may want to verify the currency of this address information using
the ASSIST Online database at https://assist.dla.mil/.
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