Lignin is considered the second most abundant organic natural compound in the world. It is a complex, amorphous highly crosslinked polyphenolic. In fact, the lignin structure is composed of aromatic and aliphatic chains in which lignin may act to protect the rubber chain against oxidation attacks thereby increasing aging resistance. In this research, the effect of lignin as silica substitution of 10 and 15 phr on processability and aging resistance on tire compounds were studied. Tire compounds were prepared by mixing while vulcanized rubbers were made by vulcanization process. The compounds were characterized using Rheometer to determine processability, i.e.
viscosity, scorch time, and cure rate. The vulcanized compounds then formed into a tensile test samples and tested under fresh conditions and under aging conditions. The aging condition was applied by heating the vulcanized rubbers at temperature 100 °C for 24 hours. Compound with lignin substitution on silica decreased the viscosity thereby increased processability by 13,2% as compared to the standard compound without lignin modification. In addition, the vulcanisate with lignin substitution on silica also increased the aging resistance by 5,9% as compared to standard compound. The results showed that lignin have a potential to be used as a filler in tire compound for
improving processability and aging resistance.