Pull-off adhesion ASTM D4541 [Paint Testing] 

Thanks for your kind comment. Appreciate it.

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It all depends on whether you accept cohesive failure at this value. In general, yes, if the result is 6 MPa / 870 psi and you have a minimum adhesion of 5 MPa / 725 psi in the specification, then the requirement is met.

It depends on the type of glue, but generally 24 to 48 hours at 23 °C/73.5 °F

Of course it matters. If the substrate is too thin and deformable, it will affect the test result and will be unpredictable.

It is depending on type of paint, agreement with client and thickness in real-life application. If we compare set of paints in the lab conditions we use the same thickness ensuring comparable results.

@@SpektrochemResearchLaboratory nicely put, is this possible with poliurethane for cross laminated timber construction ?

@@j0hnnybvllet If your substrate is strong enough that there will be no substrate failure (cohesive), then you can certainly use this test

We do not prepare field samples, I will not answer unfortunately, but look for FROSIO inspector guides or others on the subject

All requirements about pull-off adhesion test you can find in the ASTM D4541 standard procedure www.astm.org/d4541-22.html

Thank you!

The pull-off test is also used as a field method. However, we only use it under controlled temperature and humidity conditions in our laboratory. We do not perform field tests.