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Openings (not aligned with the perforations between the hole wall is not completely separated from each other, along with a certain degree of resistance) and the mixing holes (both open and closed cell

Two structures) three. Accordingly, microporous rubber including rubber and sponge rubber expanded categories. Because of different habits, domestic science and technology

Literature, meaning "sponge rubber" is not the opening of the cell and closed cell bodies distinction open. Many varieties of sponge rubber, a variety of classification.