4) Procedures(1) Set the impact tester on a hard and flat base (concrete, etc.), and set the test sample between a punch with a radiusof 6.35 ± 0.03 mm and the supporting base. The design surface shall be oriented upward.When applying punch to the back surface, use a punch and a supporting base for back surface impact. And set the test sample orienting the design surface downward and adjust the position to the center point of the supporting base.(2) Drop weight from the specified height onto the punch to make a dent on the test sample.