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Green retreaded tyre based on epoxidised natural rubber (ENR) blends in urban buses

Ahmad Kifli Bin Che Aziz, Siti Salina Sarkawi, Rohaidah Abdul Rahim


Utilization of Epoxidised Natural Rubber (ENR) in tyre tread compounds significantly improved wet grip performance and reduce rolling resistance of tyre. The blend of ENR with Polybutadiene Rubber (BR) shows a promising result for laboratory abrasion test however to date no direct correlation with the actual performance on the road. This study is conducted to evaluate on the road performance of ENR/BR blends tread compounds on retreaded tyre fitted on Malaysia’s urban buses. Two main routes which subjected with heavy traffic in Kuala Lumpur city center were selected for the test and a total of 10 buses were selected for this study. Each buses of rear drive axles was fitted with 2 units of ENR blends retreaded tyres on one side and 2 units of standard Natural Rubber (NR) blended with BR retreaded tyres formulation on the opposite side as comparison with both of tyre size of 275/70R22.5. The wear performance of the tyre tread was studied for 3 to 6 months and data collection of tread depth was done every two weeks interval. From the study, it was found ENR blends retreaded tyre formulation performed better wear resistance than standard retreaded tyres formulation. The mileage percentage of ENR tread compounds was found 30 % to 40% better than standard retreaded tyre formulation for both selected routes.


Keywords: epoxidised natural rubber; retreaded tyre; wear

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