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<p>Describes an investigation of the permeability of rubber to a number of different gases. It is found that the permeability of rubber compounds varies with the composition. Ageing, or over-vulcanisation is accompanied by a decrease in permeability. Rubber which shows a very low permeability for these reasons is, however, usually very much deteriorated and frequently brittle. The permeability to any gas is found to be directly proportional to its partial pressure, provided the total pressure is constant. The variation of permeability with total pressure depends on the thickness of the rubber and on the way in which it is supported. The permeability to hydrogen is inversely proportional to the thickness of the rubber, the specific permeability for this gas being, at 25° C., and for vulcanised r
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