Patent ID: 6858553

Claim:
A glass composition comprising: 65 wt. % to less than 74 wt. % SiO 3 ; 0-5 wt. % B 2 O 3 ; 0.1-2.5 wt. % Al 2 O 3 ; 0.4 to less than 2 wt. % MgO; 5-15 wt. % CaO; 0-10 wt. % SrO; 0-10 wt. % BaO wherein a total amount of MgO, CaO, SrO, and BaO is greater than 10 wt. % to 15 wt. %; 0-5 wt. % Li 2 O; 10-18 wt. % Na 2 O; 0-5 wt. % K 2 O wherein a total amount of Li 2 O, Na 2 O and K 2 O is 10-20 wt. %; and 0-0.40 wt. % TiO 2 , wherein a product of a mean linear expansion coefficient if a range of 50-350° C. and Young's modulus is 0.71-0.90 MPa/° C., and a mean linear expansion coefficient in a range of 50-350° C. is 80×10 −7 −110×10 −7 /° C.