Patent ID: 8178450
Filing Date: 2012-05-15
Classification: C03B,C03C,Y02P

Abstract:
1. A TiO 2 -containing silica glass, having a fictive temperature of 1,000° C. or lower, having a TiO 2 content of from 8.5 to 12% by mass, a temperature at which a coefficient of linear thermal expansion is 0 ppb/° C., falling within a range of from 40 to 110° C., a standard deviation (σ) of a stress level of striae of 0.03 MPa or lower within an area of 30 mm×30 mm in at least one plane, and having an average coefficient of linear thermal expansion, in a range of from 20 to 100° C., of from −30 ppb/° C. to 30 ppb/° C.