TT-C-490F
w/AMENDMENT 2
24 September 2015
SUPERSEDING
TT-C-490F
w/AMENDMENT 1
17 May 2013
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. Unless otherwise
specified in the contract, the Supplementary Requirements (Appendix A) section covers cleaning, and
pretreatment by chemical conversion of ferrous metals and zinc/zinc alloy coated metals and provides
specific requirements for applying Non-Chemical Agent Resistant Coatings (Non-CARC), such as a
single coat ammunition coating.
1.2 Classification. This specification covers the following cleaning methods, surface preparation
processes, and substrate classes (see 6.2).
1.2.1 Surface cleaning. Surface cleaning may include one or more of the following methods to meet
surface cleanliness requirements (see 6.1.1 and 6.1.2).
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, U.S. Army Research Laboratory,
Weapons and Materials Research Directorate, Materials Manufacturing Technology Branch,
Specifications and Standards Office, ATTN: RDRL-WMM-D, Aberdeen Proving Ground, MD
21005-5069 or emailed to richard.j.squillacioti.civ@mail.mil. 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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