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topic 60877

Does Wash Primer have Hexavalent Chrome?

October 19, 2018

Q. WHEN DID SHERWIN WILLIAMS REMOVE Cr 6+ FROM WASH PRIMER PER MIL-C-8514?

Randy Matuskey
- Glendale, California


October 2018

A. Hi Randy. According to https://www.paintdocs.com/docs/webPDF.jsp?SITEID=SWOEM&doctype=EDS&prodno=E90G16, it currently contains 0.8% by weight of Chromium, and 9.0 by weight chromium compounds. I am not familiar enough with their Environmental Data Sheets to be able to say whether this indicates that it is or is not free of hexavalent chromium.

The sheets do state --in capital letters -- "AS CURRENTLY FORMULATED", which is certainly an indication that they feel entitled to change the formulation of their product at will. Consequently, if the answer is important, the only safe thing to do is inquire directly of Sherwin-Williams with batch numbers, etc.

Your situation is probably interesting. Good luck.

Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
finishing.com - Pine Beach, New Jersey
Striving to live Aloha



March 18, 2019

Q. Is there a current replacement for DOD-P-15328? We had to stop using it due to the Hexavalent Chromium component within its mix. We have been struggling to find a suitable replacement that etches the surface of the metal to create a profile accepting to our top-coat and that has a fast dry time. Is there such a solution? Thanks for the input if there is any.

ADAM WESTHOFF
Comsaco Inc. - Norfolk, Virginia U.S.A.


March 2019

A. Hi Adam. DOD-P-15328 is long cancelled and was superceded by TT-C-490 [link is to free spec at Defense Logistics Agency, dla.mil]. This actually now covers 8 different types of conversion coatings and pretreatments for metallic surfaces, and three different classes. Type III is hex chrome free, and sounds to me like it describes wash primers. While hex chrome contributed corrosion resistance, it doesn't seem to me that chrome would have contributed to the etching you are seeking, so it sounds like there should be a suitable replacement that can etch the surface while being hex chrome free. Good luck.

Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
finishing.com - Pine Beach, New Jersey
Striving to live Aloha


March 19, 2019

Q. Ted, Yes I realize that 15328 has been canceled. We have been using formula 84, Molybdate, which is covered by TT-C-490. It does not perform as well as the wash primer did as a base primer for our enclosures. We are not getting the adherence that we were used to with the wash primer. Plus we have to wait hours before top coating. I am looking for a primer/pre-treatment, that will create a surface more accepting to our top coats without having to blast prior to. Years ago I found a company that claimed to have a wash primer without the harmful Hex-6. They have since fallen off the earth. Do you know of said sorcery? Any help you can offer is greatly appreciated.Thanks, Adam

ADAM WESTHOFF [returning]
Comsaco Inc. - Norfolk, Virginia U.S.A.


July 17, 2019

We use - DOD-P-15328D Metal Wash Primer Pretreatment Green (Part A)
Green (Part A) by Sherwin Williams - no hex chrome and no problems Product code E90G4

Sincerely,

Micheline Forth
Edwards Interiors - Rincon, Georgia

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