Patent ID: 6119483
Filing Date: 2000-09-19
Classification: C03C,G11B

Abstract:
A process for producing a glass substrate for an information recording medium, comprising the steps of:(a) polishing a principal surface of a glass substrate;(b) washing the polished glass substrate with hydrochloric acid;(c) following the washing step, chemically strengthening said glass substrate by immersing said glass substrate in a chemical reinforcement liquid and exchanging ions on the surface layer of said glass substrate with ions in said chemical reinforcement liquid having a diameter larger than that in said glass substrate;(d) cleaning the surface of said glass substrate with a cleaning agent;(e) drying the surface of said glass substrate;(f) inspecting the surface of said glass substrate; and(g) packing said glass substrate in a container;wherein at least one of the steps (b), (c), (d), (e), (f) and (g) is performed in an atmosphere in which a clean filtered air is circulated so as to prevent particles from being adhered on the surface of said glass substrate.