The Charpy impact test has been standardized for metals [23] and organic plastics [24] The types and characteristics of impact tests have been discussed by Sayre [25] and Soxman [26] has studied the drop test for cermets A highly specialized impact test employing a fly wheel was reported by Maxwell [27] The reproducibility of the Charpy test results was investigated by Driscoll [28] and the reduction in impact value by notching was studied by Quackenbos [29] who with others [30] correlated impact values with flexure tests There has been considerable difference in opinion as to the correct method of test and the interpretation of results for the impact t est.