Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Powder Coating Adhesion Testing
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Q. Sir, Is there a more accurate test method for adhesion of powder coat than cross hatch and pencil hardness? These are subjective and somewhat inconclusive. Please forward any additional methods that would be repeatable back to me. Thank you
David Ostrosky- Booneville, Arkansas
2000
A. Hi David, although everything is in the end somewhat subjective I suppose, if instead of just going for the general gist of cross-hatch testing you very carefully do standardized tests like ASTM D3359 tape test, with rollers per FED-STD-141, following the specs to the letter, I think the results will be reasonably repeatable and meaningful.
Luck & Regards,
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
A. Accurate test method: If you're using the right specified tape, cross-hatch cuts, procedures as per your adhesion testing standard used and the same as the pencil hardness test. Your tests should be as accurate as it should be. But you can include more severe tests like Mandrel bending, impact, pressure cook or permeability (done on sample plates), sawing and milling (on sample product) to reinforce your quality systems (ISO test methods). Dubious results may warrant adhesion failure of your product.
Carpo Tirol- Brisbane, Australia
2000
Q. Dear sir,
We have a powder coating plant and we want to test our powder coating components. please can you suggest a test method for powder coating components?
Presently we are using peel off test; can you suggest this method in detail?
engineering - India
February 18, 2010
Q. Is there an ASTM standard for the adhesion testing of powder coat on perforated metals? If so, what is it? If not, is there an accepted method in the industry and what is it?
Paul Brown- Dayton, Ohio
2003
A. GM9071P describes Tape Adhesion for Paint Finishes. I realize that is not your exact application, but it better describes the tape than the ASTM method.
Cynthia L. Meade- Sylvania, Ohio, USA
A. As with most people trying to obtain results using the "tape test", my frustration was with the variation in the method more so than the tape. The ASTM D3359 has an appendix that highlights some of the "Procedural Problems", such as the method of application of the tape and the angle it is removed. While searching the ASTM website for this standard I found links to companies that have made equipment that take that variation out of the test. It's interesting to know a problem that has been around for a long time has only recently been solved. I've done thousands of these tape tests now and can probably offer some decent advice on how to make them more consistent from operator to operator and from time to time. Thank you.
Dolph Himmelbauer- Cincinnati, Ohio
November 8, 2008
Q. What is the recommended tape to test according to GM9071P (tape adhesion test for paint finishes)? The more adhesive the tape the better reliability? Can I test the tape strength (N/m) by using a load cell and a caliper?
Rodrigo Madridwiper systems - Juarez, Chihuahua, Mexico
2004
A. GM 9071P mentions 3M 610, 3M 670, or 3M 898.
Christa Shirey- Sylvania, Ohio, USA
Q. Why can I not use ASTM D3359 on a paint with a hardwood substrate. Why does it matter if the blade may cut into the wood? The paint will come off the substrate if not well adhered.
George Pecoraroconsultant - Lower Burrell, Pennsylvania
January 21, 2009
Q. I'd like to add a variable to the tape adhesion test issue. Our coatings are exposed to moisture for extended periods of time. We perform a standard cross hatch/tape adhesion test but follow up with a water resistance/tape adhesion test. We place a wet cotton ball on the cross hatch pattern for 24 hours. We then remove the cotton ball, thoroughly dry the surface, apply tape and remove. We would like to know if there is an ASTM or other standard available for this - Does anybody know about this test?
Steve Coven- Skokie, Illinois
March 26, 2009
Q. Dear Sir,
Please let me know the adhesion property of tape to be used for peel off test of paint on ferrous surface.
Khare
- Jhansi, Uttar Pradesh, India
January 27, 2010
Adhesion test method
Q. How many blocks or % peel off is allowed in adhesion test and
is water boiling test the ultimate test for powder coating.
- Gujarat, India
August 18, 2019
A. Read ISO 2409 cross-cut test, then you will find answer! YES! IF boiling water cross-cut test passed, most of test of powder coating will pass too!
ANKA QIU- GZ CHINA
September 6, 2019
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Ed. note: Please see also topic 46657, "Process/Procedure for Cross Hatch Test - Measuring Adhesion by Tape Test" and topic 13961, "Strength of a powder coated part"
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