| 摘要 |
A composition for use in polishing a magnetic disk substrate which comprises an aqueous medium containing an alkali metal ion, abrasive grains, a carboxylic acid, an oxidizing agent and an antigelling agent. The polishing of a substrate of a magnetic disk with the polishing composition provides a surface having a very small roughness and a magnetic disk using a substrate polished with the composition is useful as a low flying type hard disk and is capable of performing high density recording.
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