Method of Molding Silica Glass

摘要

A method of molding a silica glass comprises: a first step of accommodating the silica glass containing OH groups in a concentration of 900 ppm to 1300 ppm by mass in a hollow portion of a mold provided with a press portion; a second step of molding the silica glass in a predetermined form by pressing the same by means of the pressing portion so that a maximum pressure can be 0.2 Kg/cm² to 0.8 Kg/cm² while heating the silica glass so that the temperature of the same can be within a hold temperature range of 1530° C. to 1630° C.; and a third step of cooling the molded silica glass.