Precision Glass & Optics offers the Schott Supremax 33, a rolled sheet borosilicate glass used for applications that require low thermal expansion, high thermal resistance, and low density (12% lighter than soda lime glass).
Other in-stock substrates include BK-7; Corning 0211; Corning Eagle 2000 XG; Corning ULE; Glaverbel float; OCLI front surface mirror; Pilkington Optiwhite; PPG Starphire; Schott’s AF-37, AF-45, and B-270; fused silica; and fused quartz.