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porn sex old,It is used to determine the impact resistance of materials including plastic films, paper, foils, etc. by free falling dart or ball method according to ASTM F1709 (method A and method B).
This instrument tests the impact resistance of plastic film and thin sheet.,porn sex old
The machine is suitable for plastic film or sheet under the impact of free dart impact at the given height, measure the impact mass and energy when 50% plastic film or sheet specimen is damaged.,kis cartoon