GLASS MATERIAL, METHOD FOR PRODUCING THE SAME AND METHOD FOR PRODUCING GLASS SUBSTRATE FOR INFORMATION RECORDING DISC USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a glass material with improved mold releasability which never affects planarity of a glass substrate for information recording obtained by molding it. SOLUTION: This glass material is characterized in that a paraffinic oil containing a higher fatty acid metal salt is formed on the surface as a releasing film with required film thickness.