This Cylindrical Mandrel tester consists of three PVC rolls which are arranged side by side and run on pivoting bearings. Thus, the coating is not exposed to damage or shear stress during the test. The test can be carried out:
- either as a “pass/fail” test, by carrying out the test with a single specified size of mandrel, to assess compliance with a particular requirement.
- or by repeating the procedure using successively smaller mandrels to determine the diameter of the first mandrel over which the coating cracks and/or becomes detached from the substrate.