ASTM D2794 is a standard test method for resistance of organic coatings to the effects of rapid deformation (impact). This test involves applying organic coatings to suitable 24 gauges metal panels and dropping a standard weight from a certain distance to induce an indenter deforming the coating as well as the substrate. UNITEDTEST offers ASTM D2794 as part of its paint testing services.

The point at which failure can occur can be determined by increasing the distance from which the weight is dropped. Paint films typically break down by cracking. The use of a magnifier such as copper sulfate or a pin hole detector is a way to allow a better visualization of the cracking. Stereoscopic evaluations can also be used.

1.1 deforming by impact a coating film and its substrate and for evaluating the effect of such deformation. 

1.2 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. 

1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 

1.4 This standard does not purport to address the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.