A comparative study was performed of fly ash and nano-CaCO3 as fillers in polybutadiene rubber with 0, 4, 8 and 12% fly ash and nano-CaCO3. Uniform sheets were prepared of well-compounded rubber. Nano-CaCO3 was synthesized by in situ deposition. The CaCO3 nanoparticles as reinforcing agents improved the tensile strength more than 50% than fly ash, and the toughness and hardness also increased significantly. Up to a 75% reduction in flammability and a 100% improvement in the tear strength were observed with nano-CaCO3.© 2005 Wiley Periodicals, Inc. J Appl Polym Sci 96: 6–9, 2005
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