The grinding characteristic silica which can be used for the kneading tooth polishing

摘要

(57) Abstract This invention, approximately the BET specific surface of 60 - approximately 150m2/g, approximately RDA grinding power of 30 - approximately 90, approximately 1.440 - approximately 1.450 refractive index, approximately 115 - approximately 170ml/l00g, desirably the DOP oil absorption quantity to 170ml/100g and discloses the sinkage silica which approximately possesses the average particle diameter d of 6 - approximately 13 millimicrons₅₀ from above 120ml/100g. In addition, this invention the said silica discloses the kneading tooth polishing composition which at weight is contained in 5 - 50% ratios.