OZONE RESISTANCE OF ELASTOMERIC VULCANIZATES AT ELEVATED TEMPERATURES

摘要

This report covers the results of accelerated ozone exposure tests of antiozonant inhibited NBR and NBR based vulcanizates at temperatures of 100°F, 120°F, and 158°F, and at ozone concentrations of 25 pphm and 50 pphm.nIt was found that the efficiency of the antiozonants decreased sharply with an increase in temperature.nIt was also discovered that the addition of special heat resistant additives, developed on a separate program at this Arsenal, greatly improved the ozone resistance of the antiozonant inhibited NBR and NBR based vulcanizates at elevated temperatures.