Patent ID: 7596968

Claim:
A method of making a borosilicate glass, comprising: forming a homogeneous mixture by mixing a plurality of components, comprising: silicon dioxide (SiO 2 ) in a range from about 60% to 74% by total composition weight, boric oxide (B 2 O 3 ) in a range from about 9% to 25% by total composition weight, aluminum oxide (Al 2 O 3 ) in a range from about 7% to 17% by total composition weight, and at least one alkali oxide in a range from about 2% to 7% by total composition weight; melting the homogeneous mixture; and sintering the homogeneous mixture forming a borosilicate glass, wherein the borosilicate glass has a coefficient of thermal expansion (CTE) that is in a range between about 30×10 −7 /° C. and 55×10 −7 /° C., and wherein the homogeneous mixture resists devitrification upon sintering without the addition of an inhibitor oxide.