| abstract |
The present invention relates to a fused and cast article comprising in wt% based on oxides and in general 100%, wherein the article contains an additive selected from NbO, TaO and mixtures thereof in an amount of 1.0 wt% or less, as well as the ratio A / B mass contents of AlO / BO is 2.0 or less, with the exception of fused and cast products in the form of blocks 220 × 450 × 150 mm or cylindrical bars with a diameter of 30 mm and a height of 30 mm, having the following chemical composition in wt% based on oxides: The invention can be applied to glass melting furnaces. |