This part of ISO 6272 describes a method for rapidly deforming, by impact with a spherical indenter of diameter 12,7 mm or 15,9 mm, a coating film and its substrate and evaluating the effect of such deformation.
NOTE The term “impact resistance” is included in the title and text of this part of ISO 6272, but one important characteristic of theapparatus used is that it should produce rapid deformation rather than a true impact.
This test method should be restricted to testing in only one laboratory when numerical values are used because ofthe poor reproducibility of the method. Interlaboratory agreement is improved when ranking is used in place ofnumerical values.