Fillers are compounding ingredients added to rubber compounds for the purpose of
reinforcing them and/or cheapening their cost. Traditional fillers include carbon black, silica,
calcium carbonate, calcium silicate and clay. Carbon black is the most popular filler added to the
rubber compounds due to its ability to enhance certain properties, especially mechanical properties
[1-3]. Clay and calcium carbonate are considered as useful fillers in rubber compounds because of
their low cost. Much work [4-7] has been done to study the use of clay and calcium carbonate as
fillers for rubber compounds. Apart from the traditional fillers, the use of renewable materials such