| http://www.w3.org/ns/prov#value | - The content of the tetravalent metal element hydroxide in the abrasive grains is preferably 50 mass % or greater, more preferably 60 mass % or greater, even more preferably 70 mass % or greater, especially more preferably 80 mass % or greater and extremely preferably 90 mass % or greater, based on the total mass of the abrasive grains.
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