| abstract |
The present invention relates to a molten, fluid refractory product comprising, in weight percentages on the basis of the oxides and for a total of 100% of the oxides:n ZrO 2 +Hf 2 O: remainder to 100% 4.5%<SiO 2 <6.0% Al 2 O 3 <0.80% 0.3%<B 2 O 3 <1.0% Ta 2 O 5 +Nb 2 O 5 <0.15% Na 2 O+K 2 O<0.1% K 2 O<0.04% CaO+SrO+MgO+ZnO+BaO<0.4% P 2 O 6 <0.05% Fe 2 O 3 +TiO 2 <0.55% other oxide species, optionally including Y 2 O 3 : <1.5%, where Y 2 O 3 <0.3%,n nthe “A/B” ratio of Al 2 O 3 /B 2 O 3 content by weight being 0.5 to 2.0. The invention can be used in glass melting furnaces. |