TYRE TUBES
RESISTANCE TO HEAT. A temperature of more than 160 de"'fpes, even in moderate weather and iuSor ordinary road conditions, is gencritcd in an automobile tyre, while runring, according to tests made by the s igineering department of an American tyre company. This means that the inner tube must be so constructed as to withstand this and even higher temperatures when occasion arises. Various experiments as regards tubes and their reaction against heat have been made. “Experts have found,” says one authority, “that zinc oxide compounded with rubber, producing u white tube, forms a greater heat combatant than where pure gum is used. Tests were made in the intense heat of the Majuve desert, and .‘-bowed that under the most excessive heat white tubes retained tlieir tensile ‘strength with but a slight reduction in elongation, while the pure gum tube lost over 30 per cent, of its tensile strength and over 37 per cent, of its elongation qualities. These facts were particularly noticeable in larger sized tubes where more material is involved/'
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Bibliographic details
New Zealand Times, Volume L, Issue 11655, 20 October 1923, Page 14
Word Count
173TYRE TUBES New Zealand Times, Volume L, Issue 11655, 20 October 1923, Page 14
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