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Understanding Adhesion Test Data - The Importanceof Round Robin Evaluations

Understanding Adhesion Test Data - The Importanceof Round Robin Evaluations
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Current ASTM standards require a statement of precision and bias as part of the standard test method. This statement allows a user to properly interpret results obtained by a competent operator. Development of these statements typically involves an interlaboratory study, commonly referred to as a round-robin test.  

Product Number: 41208-455-SG
Author: Lloyd Smith, J. Peter Ault
Publication Date: 2008
Industry: Coatings
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$20.00
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Current ASTM standards require a statement of precision and bias as part of the standard test method. This statement allows a user to properly interpret results obtained by a competent operator. Development of these statements typically involves an interlaboratory study, commonly referred to as a round-robin test.  The paper presents the results of an interlaboratory study (ILS) on ASTM D4541, Standard Test Method for Pull-Off Strength of Coatings Using Portable Adhesion Testers. A key finding of the study is that results vary depending on the test instrument used. In order to properly report on and interpret the test data, one needs to identify the instrument used. When the instrument is known, ASTM data on precision and bias allows a user to properly interpret the test data. The paper also discusses the process used by ASTM for conducting an ILS, and the round-robin tests currently under development by ASTM D01.46 – Industrial Protective Coatings.

Current ASTM standards require a statement of precision and bias as part of the standard test method. This statement allows a user to properly interpret results obtained by a competent operator. Development of these statements typically involves an interlaboratory study, commonly referred to as a round-robin test.  The paper presents the results of an interlaboratory study (ILS) on ASTM D4541, Standard Test Method for Pull-Off Strength of Coatings Using Portable Adhesion Testers. A key finding of the study is that results vary depending on the test instrument used. In order to properly report on and interpret the test data, one needs to identify the instrument used. When the instrument is known, ASTM data on precision and bias allows a user to properly interpret the test data. The paper also discusses the process used by ASTM for conducting an ILS, and the round-robin tests currently under development by ASTM D01.46 – Industrial Protective Coatings.

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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. 
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Author: Dr. Daniel Totev
Publication Date: 2018
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Pull-off adhesion testing of coatings is commonly used for product testing and qualification as well as quality control / quality assurance. However, initial adhesion values do not necessarily correlate with service life of coatings or their corrosion protection performance. Adhesion of several product chemistries to steel is examined in this study before and after immersion exposure. Results are presented within the context of laboratory corrosion testing in an effort to investigate the significance of adhesion testing in modern lining systems.
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