Effect of air change rate on rubber accelerated ageing tests in hot air. Part 2. Ageing of different compounds

Seven different compounds based on NR, SBR, NBR and EPDM were aged at 100 and 125°C, and 3, 6.5 and 10 changes of air per hour, and in a normal oven at much lower air change rate at 100 °C. Ageing was evaluated by tensile strength, elongation at break, stress at intermediate elongation and changes of IRHD after ageing. The statistical analysis of results shows that air change rate has a significant effect on ageing results.