PROCESS FOR PRODUCING GLASS SUBSTRATE FOR MAGNETIC DISC

摘要

Provided is a process for producing a glass substrate for a magnetic disc. According to the process, foreign particles are less susceptible to remaining on a glass substrate in polishing the principal surface of the glass substrate with a polishing fluid that contains a zirconia-containing polishing agent. The process includes a polishing step for polishing at least a part of the surface of a glass substrate with a polishing fluid which contains zirconia-based abrasive grains as a polishing agent, and a cleaning step for cleaning the polished glass substrate, wherein: a non-zirconia substance is formed on a part of the surface of each zirconia-based abrasive grain; and the cleaning step is conducted by bringing the polished surface of the glass substrate into contact with a cleaning fluid in which the non-zirconia substance can be dissolved.