Test 2: Test for Impact Strength Ambient/Cold Temperature
a) Impact Test: Ambient Temperature
Carry out impact test in accordance with 5(a). (Pendulum apparatus) The hardness of the hammer shall be at least 20 HRC The tools are to be tested at the ambient temperature (23+/-5C) of the test room.
The fall height of the hammer is determined by the formula:
H= fall height of the hammer, m.
F= weight of the tool tested N
P= weight of the hammer N
Determine the fall height H as a function of it's weight, P, so that the energy, w, of impact on the tool to be tested shall be equal to that of this tool falling from the height of 2m onto a hard surface. Three different locations will be impacted. The test is considered passed if no electrical punctures, spark over, or flashover occurs during the test period, and the limits of the leakage current are not exceeded.
b) Impact Test: Cold Temperature
Condition the tool by placement in a cooling chamber for 2 hours at -25+/-3C. The impact test shall take place within 2 minutes after removal from the cooling chamber. The ambient room temperature shall be 23+/-5C. The impact test should conform to the test in par. 2a. H=(w)/(p)=(0.6 x F)/P. Determine the fall height H as a function of it's weight, P so that the energy to that of the tool falling from a height of 0.6m on a hard surface.