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Pull-Off Adhesion Testing of Coatings - Improve Your Technique

Pull-Off Adhesion Testing of Coatings - Improve Your Technique
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Pull-off adhesion testing is widely used to assess the protective coating process. It is also used to determine if a coating is fit for service in new construction and for repairs to existing structures. The result is often critical to the acceptance or rejection of a coating process, as the adhesion value quoted by the paint manufacturer can be adversely affected by aspects of the coating process. Low adhesion values are indicative of premature failure of the coating and are often due to inadequate surface preparation of the substrate. 

Product Number: 41215-893-SG
Author: JF Fletcher, DJ Barnes
Publication Date: 2015
Industries: Test Method , Coatings
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$20.00
$20.00

Pull-off adhesion testing is widely used to assess the protective coating process. It is also used to determine if a coating is fit for service in new construction and for repairs to existing structures. The result is often critical to the acceptance or rejection of a coating process, as the adhesion value quoted by the paint manufacturer can be adversely affected by aspects of the coating process. Low adhesion values are indicative of premature failure of the coating and are often due to inadequate surface preparation of the substrate. ASTM D4541 and BS EN ISO 4624 describe several different test apparatuses; however, the basic approach of gluing a test dolly to the coated surface and then exerting a perpendicular force to the surface in an effort to remove both the dolly and the coating from the substrate is common to all these standards. A measure of the adhesion of the coating system is the force at which the coating fails, and the type of failure obtained. Trials have demonstrated that many aspects of the testing method, such as the mixing of the glue, the preparation of the coating surface and the face of the dolly and the temperature of the test, all affect the results. This paper will investigate the effects of any deviation from the proscribed method in every aspect of the test. Each aspect is examined in turn, the results tabulated and the potential effect on a valid adhesion test result is discussed.

Pull-off adhesion testing is widely used to assess the protective coating process. It is also used to determine if a coating is fit for service in new construction and for repairs to existing structures. The result is often critical to the acceptance or rejection of a coating process, as the adhesion value quoted by the paint manufacturer can be adversely affected by aspects of the coating process. Low adhesion values are indicative of premature failure of the coating and are often due to inadequate surface preparation of the substrate. ASTM D4541 and BS EN ISO 4624 describe several different test apparatuses; however, the basic approach of gluing a test dolly to the coated surface and then exerting a perpendicular force to the surface in an effort to remove both the dolly and the coating from the substrate is common to all these standards. A measure of the adhesion of the coating system is the force at which the coating fails, and the type of failure obtained. Trials have demonstrated that many aspects of the testing method, such as the mixing of the glue, the preparation of the coating surface and the face of the dolly and the temperature of the test, all affect the results. This paper will investigate the effects of any deviation from the proscribed method in every aspect of the test. Each aspect is examined in turn, the results tabulated and the potential effect on a valid adhesion test result is discussed.

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