Antiozonant effect of paraffin waxes based on their hydrocarbon characteristics

Properties of ten wax compositions recommended for rubber goods, especially for tyres were evaluated. Routine test methods and high temperature GC and DSC have been applied. A typical NR/SBR rubber compound and two tyre sidew all compounds were used. Ozone accelerated tests were carried out in an ozo ne chamber and a refrigerator equipped with an ozone generator at temperatu res of 40 and 0 degrees C. The antiozonant effect of waxes was related to t heir chemical structure, e.g. carbon number distribution of normal and bran ched paraffins. The most effective wax compositions at high and low tempera ture were selected.