TT-C-490 Amended – Chemical Conversion Coatings

TT-C-490, “Chemical Conversion Coatings and Pretreatments for Metallic Substrates (Base for Organic Coatings),” Revision F has just been updated with the release of Revision F with Amendments 1 and 2 interfiled.  The new 34-page federal specification is widely used throughout industry, so many of you will need this new edition.  Changes are extensive.  Get your copies now from Document Center Inc.

When is TT-C-490 used?  It covers processes, pretreatments, and pre-primer surface preparation for metallic substrates prior to coating applications.  Why?  To delay the onset of corrosion and to promote the adherance of primers.  It’s called out in many government contracts, including those issued by the DoD (U.S. Department of Defense.)

The new update states that changes are too extensive to allow for those black lines in the margins that are often used to identify areas where revisions have been made.  I will say that they’re correct — there are a lot of changes.  The scope has been expanded, the reference documents section has been revised, and so on.  Of particular note is the expansion of the toxicity clearance from strictly to the Army supply system to the Government supply system in general.  And of course, the migration from the MSDS to SDS reporting remains on track.

You’ll also be pleased to note that in this new edition of TT-C-490F, inspection responsibilities have been expanded to include both ISO 9000/IEC 17025 or NADCAP certified facilities.

Meeting the requirements of the military and federal specification system is essential in successfully fulfilling government contracts.  If you’d like help setting up a compliant documentation system to ensure that these documents are being used correctly in your organization, you’ll want to check in with us for more information on our Standards Online custom multi-user service.  Contact our staff via phone (650-591-7600) or email ( for more information on how we can be of assistance to you and your compliance program.

Meantime, if you need a copy of the new TT-C-490 and want the no-charge notification service that comes with every Document Center purchase, go to our webstore at  Here’s a direct link to the order page for TT-C-490.  You’ll find our prices for government documents to be among the lowest around and our services to be the best!  Make us your Standards Experts.

New TT-C-490 Revision F released for Chemical Conversion Coatings and Pretreatments for Metallic Substrates (Base for Organic Coatings)

TT-C-490 Revision F, “Chemical Conversion Coatings and Pretreatments for Metallic Substrates (Base for Organic Coatings),” has just been released and is available now from Document Center Inc. in either pdf or paper format.  This federal specification replaced MIL-C-490 and MIL-P-14504 and is one of the most commonly used plating specifications we sell.

TT-C-490F covers processes, pre-treatments, 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 pre-treatments and pre-primer coatings.

The new 24-page revision has extensive changes from the now-obsolete 17-page TT-C-490E from 2002, so there are no lines in the margins showing you the updated material.   Changes appear to have been made throughout the document.

Document Center Inc. has been providing mil-specs and standards to industry for over 30 years, and since 1993 on our website, You can count on us to provide you with the latest information and updating services that are not available from many other sources.  Feel free to get in touch with us by phone (650-591-7600), fax (650-591-7617) or email (  We have the expertise to assist you with not only your standards purchases but other management services you need to keep your collection in good working order.

The Plating Spec Poster – A handy tool for plating and coating specialists

Techplate’s Plating and Anodizing Specifications Chart is a handy wall chart developed to summarize a variety of frequently referenced plating specs.

The 2006 Edition covers a wide variety of metals and coatings.  Various classes are covered, along with thicknesses, and applications.  It’s 18 inches wide by 24 inches high, so it’s easy to post and reference.

Here is a list of some of the coatings covered and specs that apply:

Anodic Coatings MIL-A-8625
Black Chromium Plating MIL-DTL-14538
Black Oxide Coating MIL-DTL-13924 and AMS-2485
Cadmium Plating AMS-2700 and ASTM-B766
Chemical Conversion Coatings MIL-DTL-5541
Chromium Plating AMS-2460
Chemical Finish Black MIL-F-495
Copper AMS-2418
Electroless Nickel Coatings AMS-2404 and AMS-C-26074
Electropolish ASTM-B912
Gold Plating ASTM-B488 and AMS-2422
Lubricant, Solid Film MIL-PRF-46010
Magnesium Anodic Treatment AMS-M-45202 and ASTM-D1732
Magnesium Chromic Treatment AMS-M-3171
Nickel Coatings AMS-QQ-N-290 and AMS-2403
Passivation Treatments AMS-2700
Light Phosphate Coating TT-C-490
Heavy Phosphate Coating MIL-DTL-16232
Salt Bath Nitride AMS-2753
Silver Plating ASTM-B700
Sulfamate Nickel MIL-P-27418
Tin Coatings ASTM-B545
Tin Lead Plating AMS-P-81728
Vacuum Cadmium Plating AMS-C-8837
Zinc ASTM-B633
Zinc Alloy Plating ASTM-B840 and ASTM-B841