| 摘要 |
A rubber composition, expansible under vulcanization conditions consisting of at least one vulcanizable synthetic rubber, vulcanizing agents and a propellant gas donor under vulcanizing conditions consisting of (a) from 100 to 900 parts by weight, based on 100 parts by weight of said synthetic rubber, of natural, non-pretreated chalk, and (b) from 5 to 120 parts by weight, based on 100 parts by weight of said synthetic rubber, of at least one natural or synthetic fatty acid having from 12 to 22 carbon atoms.
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