- Author
-
Seiler, J. F., Jr.
|
McKnight, M. E.
|
Masters, L. W.
- Title
- Development of a Test Apparatus and Method for Measuring Adhesion of Protective Coatings.
- Coporate
- National Bureau of Standards, Washington, DC
- Sponsor
- Tri-Services Building Materials Investigation Program Committee
- Report
-
NBSIR 82-2535
July 1982
- Distribution
- Available from National Technical Information Service
- Keywords
-
protective coatings; tests; test equipment; measurement; adhesion; pneumatic equipment
- Abstract
- A pneumatic test apparatus and associated test method for measuring the adhesion of coatings have been developed with particular emphasis on: (1) overcoming some of the shortcomings of existing tests; and (2) providing a method which can provide quantitative information for both laboratory and field applications. The test apparatus utilizes compressed air to lift a stainless steel loading fixture (button) which is bonded with an adhesive to the surface of the protective coating. The rate at which the loading fixture is loaded is controlled by a precision air pressure gauge and the tensile force required to lift the button from one coating is measured. Assuming the level of adhesion of the adhesive to the coating is greater than that of the coating to the substrate, the tensile force provides a measure of the coating adhesion. Laboratory studies with two coating materials have been performed to assess the method. This report describes the test apparatus and associated test method and presents test data obtained to date, proposed modifications to the initial test apparatus design, and additional research needs. An Instruction Manual for use of the test apparatus is included in the Appendix.