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- W2013663681 abstract "Abstract The permeability of rubber membranes was found to be approximately inversely proportional to thickness. The recently developed “super” automobile inner tubes are therefore undoubtedly better air containers than the ordinary tubes of smaller gage. Most of the increase in permeability resulting from stretch can be accounted for by the decrease in thickness accompanying stretch. Pure-gum stocks made from various commonly used plantation rubbers did not vary much in permeability. A stock made from a wild rubber, caucho ball, had a somewhat lower permeability. Milling on a steam-heated mill was found not to change permeability appreciably. The early stages of milling on a cold mill reduced the permeability of a stock slightly. The temperature of vulcanization seemed to have no influence on permeability, provided the test slabs were cured to the same state. It may be concluded, therefore, that the recent trend towards higher temperatures of cure for inner tubes has not adversely affected their air-retaining capacities. None of the various softeners or other organic materials tried was found to effect any appreciable decrease in the permeability of a rubber stock The results indicate that permeability is roughly proportional to the volume of rubber hydrocarbon present in a stock. The nature of the principal compounding ingredient used in a stock does have some influence on permeability, however Clay, channel black, and blanc fixe are among the compounding ingredients having the most beneficial influence on permeability. Experiments with stocks containing various quantities of zinc oxide indicate that permeability varies inversely with the volume of pigment present. From the standpoint of the air-retaining capacity, the loading of inner-tube stocks with pigments is therefore desirable." @default.
- W2013663681 created "2016-06-24" @default.
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- W2013663681 date "1931-12-01" @default.
- W2013663681 modified "2023-09-27" @default.
- W2013663681 title "Permeability of Rubber to Air. II: Effect of Stretch, Thickness, Milling, Compounding Ingredients, Kind of Crude Rubber, and Temperature of Vulcanization" @default.
- W2013663681 doi "https://doi.org/10.5254/1.3547520" @default.
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