Patent ID: 7687417

Claim:
A glass composition consisting essentially of, based on mole percent, (i) 46- 57.96% B 2 O 3 , (ii) a glass network former selected from the group consisting of 0.5-8.5% P 2 O 5 , 1.72-5.00% SiO 2 , and mixtures of P 2 O 5 and SiO 2 wherein the combined mole % of said mixture of P 2 O 5 and SiO 2 is 3.44-8.39%, (iii) 20-50% CaO, (iv) 2-15% Ln 2 O 3 where Ln is selected from the group consisting of rare earth elements and mixtures thereof; (V) 0-6% M′ 2 O where M′ is selected from the group consisting of alkali elements; and (vi) 0-10% Al 2 O 3 , wherein said glass composition is a ceramic-filled, devitrified glass composition, wherein said glass composition flows prior to crystallization, and with the proviso that the composition is water millable.