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1. A method for increasing the hardness of silica/rubber mixtures comprising blending with said mixture at least one silane and a hardness-increasing amount of at least one member selected from the group consisting of thixotropic fumed silica; precipitated silica; an MQ resin wherein Q is SiO 4/2, M is R 1 R 2 R 3 SiO 1/2, and R 1, R 2, and R 3 are the same or different functional