Let me ask one question. If the required range is 5mpa. Dolly has removed from the substrate on 6mpa, but it shows cohesive failure. Can we accept because it has removed from 6mpa.
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.
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.
Hi, what is the thickness of paint you have chosen? or how thick would you have painted the paint to be sufficient for this test? thank you in advance!
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.
Thank you for clearly demonstrating the test method!
Thanks for your kind comment. Appreciate it.
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This music is perfect for everyone to remember this video.
Let me ask one question. If the required range is 5mpa. Dolly has removed from the substrate on 6mpa, but it shows cohesive failure. Can we accept because it has removed from 6mpa.
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.
Does pulloff adhesion test varies subjected to substrate thickness? Any reference?
Of course it matters. If the substrate is too thin and deformable, it will affect the test result and will be unpredictable.
How are test samples being obtained in the field as representative samples?
We do not prepare field samples, I will not answer unfortunately, but look for FROSIO inspector guides or others on the subject
How long do you let the glue set before performing the pull test?
It depends on the type of glue, but generally 24 to 48 hours at 23 °C/73.5 °F
Is this performed only in the lab?
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.
Hi, what is the thickness of paint you have chosen? or how thick would you have painted the paint to be sufficient for this test? thank you in advance!
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
In ASTM method
Does Scouring require??
All requirements about pull-off adhesion test you can find in the ASTM D4541 standard procedure www.astm.org/d4541-22.html
Good f music
Thank you!