5. Significance and Use
5.1 Coatings attached to substrates are subjected to damaging impacts during the manufacture of articles and their use in service. In its use over many years, this test method for impact resistance has been found to be useful in predicting the
performance of organic coatings for their ability to resist cracking caused by impacts.which is made more visible by the use of a magnifier, by the application of a copper sulfate (CuSO4) solution on steel, or by the use of a pin hole detector.