test plastic film, flake armor plate coating, etc material's impact strength, standards of GB 9639, ASTM D1709, JIS K7124, The ... to test the 50% energy ( figure in weight) of the impact failure ,in the condition of impacting freeness with the restrictive ... 9639, ASTM D1709, JIS K7124, etc. It is the necessary testing instrument for school, laboratory, graduate school, industry, mining and inspection ...