(1) Equipment
See GB1732-79 "Determination of Coating Film Impact Resistance". The impact Tester is shown in Figure 6-5. (Related instrument: impact Tester)
(2) Sample
See Table 6-2.
(3) Test method
Under the test conditions of (23±2)°C and relative humidity of 5o%±5%, put the sample on the base of the impact instrument, press the button to make the steel ball drop from a predetermined height, and check whether the sample is impacted. Whether the coating film in the groove is separated or whether the coating film is detached from the bottom plate, change the height, and find the maximum height that does not appear to crack or detach. The distance between the edge of each impact point should not be less than 15 mm, the distance between the impact part and the edge of the sample should not be less than 15 mm, and two points should be measured for each sample.
(4) Results
Report the maximum height of the film without cracking or detachment.
