This Part of GB/T 20624 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, but one important characteristic of the apparatus 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 of the poor reproducibility of the method. Interlaboratory agreement is improved when ranking is used in place of numerical values.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this Part of GB/T 20624. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this Part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 20624.2-2006 The following standards are cited：
