Measuring Peel Adhesion of Coatings.
Measuring Peel Adhesion of Coatings.
(545 K)
McKnight, M. E.; Seiler, J. F., Jr.; Nguyen, T.;
Rossiter, W. J., Jr.
Journal of Protective Coatings and Linings, Vol. 12,
No. 5, 82-89, May 1995.
Keywords:
adhesion; building technology; peel test; coatings
Abstract:
An essential requirement of protective coatings is that
they adhere to the substrate to which they are applied.
This is an obvious requirement, but it is a difficult
one to measure quantitatively. Many procedures are
available for assessing coating adhesion, including ASTM
D 3359 for peel, ASTM D 4541 and ISO 4642 for tensile,
and a reported procedure for shear. However, all of the
procedures have limitations. For example, the D 3359
peel test is qualitative, while the tensile and shear
tests require gluing a loading fixture to the surface of
the coating. None of the procedures is particularly
suitable for determining adhesion of coatings exposed to
a wet environment. This article describes a
quantitative, repeatable procedure for measuring peel
adhesion that was developed at the National Institute of
Standards and Technology (NIST) primarily to measure the
adhesion of coatings to a steel substrate exposed to a
wet environment. Two examples of its application are
presented. These examples are measurements of the wet
adhesion strength of powder coatings to steel and the
dry adhesion strength of water-borne coatings to steel.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899