High temperature resistant glass plumb bobs be crystallized

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The present invention comprises a high temperature resistant glass plumb bobs be crystallized, the 20-45 mol % BaO, 40-60 mol % SiO 2, 0-30 mol % ZnO, 0-10 mol % Al 3 2 O, 0-5 mol % [...] 2, 0-2 mol % MgO, 0-2 mol % CaO, 0-2 mol % [...] 2, 0-10 mol % 2 O 2 O3 and 0.5-4 mol % M B 3 ( M = Y, La or rare earth elements) contains 0.5-4 mol % ZrO and/or 2, and their use.