| 摘要 |
An abrasive shaped article composed of at least 90% by weight, based on the weight of the abrasive shaped article, of silica and having a bulk density of 0.2 g/cm 3 to 1.5 g/cm 3 , a BET specific surface area of 10 m 2 /g to 400 m 2 /g and an average particle diameter of 0.001 ~m to 0.5 ~m. An abrasive disc having fitted thereto at least one of the abrasive shaped article is advantageously used for polishing a material such as substrate. Preferably at least two kinds of abrasive shaped articles are fitted to the supporting auxiliary, at least one kind of which has a bulk density of 0.7 g/cm 3 to 1.5 g/cm 3 and at least one kind of which has a bulk density of at least 0.2 g/cm 3 but smaller than 0.7 g/cm 3 . |
