Method of molding synthetic silica glass molded body

A method of molding a synthetic silica glass molded body by accommodating a synthetic silica glass block in a mold provided with a pressing portion, and by pressing the block while heating, the method comprising:

• washing the synthetic silica glass block so that a concentration of copper which is present on the surface of the synthetic silica glass block is 2 ng/cm2 or less, and so that a concentration of aluminum thereon is 10 ng/cm2 or less, before accommodating the synthetic silica glass block in the mold;
• heating high purity carbon powders in which a content of copper is 40 wt.ppb or less and a content of aluminum is 100 wt.ppb or less at a temperature condition of 1200° C. to 1900° C.;
• heating the mold at a temperature condition of 1700° C. to 1900° C.;
• after the heating the high purity carbon powders and the heating the mold, applying the high purity carbon powders on the inner surface of the mold, before accommodating the synthetic silica glass block in the mold;
• and
• molding the synthetic silica glass block in a predetermined form by pressing the block using the pressing portion while heating the block so that a temperature of the block is maintained within a hold temperature range of 1500° C. to 1700° C., after accommodating the washed synthetic silica glass block in the mold.