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WARNING: There will be a loud bang and the Adhesion Tester may jump up a few centimetres
as the dolly and coating detach and the energy in the tester is released. For personal safety it
is recommended that the operator does not lean over the Adhesion Tester during use.
4. Immediately after the test is complete and the pull-off force has been recorded, slacken the handwheel
or nut to remove all the force from the unit.
2.4 ASSESSING THE RESULTS
To record the result, first inspect the face of the dolly. In most cases the coating will fully adhere to the dolly
and the test can be claimed as 100% valid. In some cases, the coating will cover only part of the area of the
dolly and a partial adhesion failure should be recorded.
If no coating is present on the dolly this must be recorded as a failure of the adhesive (or glue). This is
normally due to incorrect or insufficient mixing of the component parts of the adhesive, or incompatibility of
the adhesive and the coating.
Observing the test area will give additional information about the type of failure; adhesion and cohesion
between different layers of the coating.
3 ADHESIVES
The adhesive supplied with the instrument is Regular Araldite which is a two component epoxy paste. When
mixed, it is to be used within 1 hour. The two components should be mixed in roughly equal portions.
Curing Times:
•
24 hours at 25° C
•
3 hours at 60° C
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