This research work investigated and compared the cure characteristics of cockle sea shell powder and carbon black as fillers in natural rubber compounds. 65μm particle size of cockle sea shell powder, and N330 carbon black were used at filler loading of 10 – 70pphr. Standard Nigeria Rubber (SNR10) was used as the matrix. The cure characteristics of the composites were determined using Oscillating Disc Rheometer (ODR2000). The minimum and maximum torque of cockle sea shell powder increased with filler loading. The increment was not obvious at 10 – 40pphr. Scorch and cures time decrease as the filler loading increases, cure rate of the cockle sea shell composites increases with increasing filler loading. Percentage reversion decreases as the filler loading increases: with highest value of 16% at 10pphr, least value of 9% at 70pphr for cockle sea shell powder filled natural rubber and carbon black filled natural rubber has the highest value of 8% at 10pphr, least value of 4% at 70pphr. All these parameters followed similar trend with that of carbon black composites. When compared with carbon black composites, Cockle Sea shell powder composites has higher minimum and maximum torque, cured faster which in turn makes the percentage reversion faster and higher than the composites of carbon black. Considering cost, availability and applications cockle sea shell filler may serve as a good substitute for carbon black.
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