Patent ID: 8685506

Claim:
A tablet, comprising: bismuth-based glass; and a refractory filler, wherein the bismuth-based glass comprises, as a glass composition, in terms of mass %, 70 to 90% of Bi 2 O 3 , 2 to 12% of B 2 O 3 , 0 to 5% of Al 2 O 3 , 1 to 15% of ZnO, 0 to 10% of BaO, and 0 to 8% of CuO+Fe 2 O 3 , the tablet comprises 1 to 25 vol % of alumina as the refractory filler, a specific surface area of the alumina being 0.1 to 3 m 2 /g, the tablet has a filling ratio of 71% or more, and the alumina has a 10% particle diameter D 10 of 0.1 to 5 Î¼m, an average particle diameter D 50 of 1 to 10 Î¼m, and a 90% particle diameter D 90 of 10 to 30 Î¼m.