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In order to obtain the longest life for motor cover inflating air-bags two features are necessary in the rubber: (a) that it is a mixing not readily oxidized, (b) that it has a low permeability. This latter point has been discussed by Daynes (Trans. Inst. Rubber Ind., 3, 438 (1928)), and it is probable that it is a very important factor as at the temperatures normally used in vulcanizing the rate of diffusion of gas through rubber is greatly increased. It is conceivable that a mix having a low permeability and poor aging would outlast one having high permeability and good aging, as in the former case the deterioration of the rubber would be kept close to the surface. As little information is available on the effect of different mixing ingredients on the rate at which a gas passes through the rubber, the experiments outlined below were made.

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