This test method covers a procedure for rapidly deforming by impact a coating film and its substrate and for evaluating the effect of such deformation.

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.
Coating on .036 inch thick phosphated steel panel shall withstand impact with 1/2" Gardener impact tester ball at 26 inch pounds direct and reverse.  No grazing or loss of adhesion.  Finish shall not be able to be removed at impact area with 3M Y-9239 tape.