Synthetic Rubber Inner Tubes Lose Less Air
Large scale tests of inner tubes made from Butyl are, despite certain difficulties, being continued at Fort Dunlop. “Production must be restricted at present because supplies of Butyl have to be obtained abroad and because certain technical and production problems still need attention,”' a Dunlop official explained, “but we find that this synthetic rubber which made a name for itself during the wartime shortage is ten times better "'than natural rubber in resisting the passage of air through the walls of the tube. “As a result, less frequent topping- up of inflation pressures is needed and forgetfulness in.this direction is much less, harmful to the cover. In other respects, such as elasticity and resistance to injury, Butyl is very similar' to natural rubber in its general suitability for inner tubes.”
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https://paperspast.natlib.govt.nz/newspapers/BPB19480806.2.25
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Bay of Plenty Beacon, Volume 12, Issue 78, 6 August 1948, Page 5
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137Synthetic Rubber Inner Tubes Lose Less Air Bay of Plenty Beacon, Volume 12, Issue 78, 6 August 1948, Page 5
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