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Silica ash.

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Google Goodyear on using silica from rice husks.    It is a cheaper way of obtaining silica for tire production than from using sand!


Rice husks are burned to generate electricity in some areas, and the resulting ash contains silica, which can be extracted.   Used in place of carbon black, silica rubber has 20% less rolling resistance, and can result in 3 - 5% better gas mileage!

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