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nature : Shao Yi's Fall (Schopper) hardness measurements of hard rubber and plastic expressed by the hardness. Determination of a certain diameter steel balls, to a certain load under the pressure test unit sunk by depth. A, C, D type three. Indentation-load relations with Shore A, imposed load weight 1.0 kg; Shore C-type and D-type load imposed both weight 5.0 kg.
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