Journal of Metals, Materials and Minerals

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Sponge rubber used for monolayer rubber stamp was produced from nitrile butadiene rubber (NBR). Open cells in sponge rubber were created using salt leaching method. Effect of size and amount of sodium chloride which was used as a water soluble salt on the creation of open cells in the rubber was investigated. Carbon black was used as a filler. A different type of surfactant was added to increase the leaching out of salt from the rubber. Cure characteristics of the compound rubbers: maximum torque, minimum torque, scorch time and cure time as well as hardness of the prepared sponge rubber were determined. Morphology of the produced sponge rubber by scanning electron micrographs displayed interconnecting open cells. The monolayer sponge rubber assembled in rubber stamp had high oil ink absorption and gave clear imprint.

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