Abstract: A novel fused and cast refractory product with a high zirconia content having improved electrical resistivity includes, as a percentage by weight relative to the oxides and for a total of more than 98.5%: ZrO2+Hf2O: >85% SiO2: 2% to 10% Al2O3: 0.1% to 2.4%, with Al2O3/SiO2<0.5 Y2O3: ?1%, B2O3: <1.5%; and a dopant selected from the group formed by V2O5, CrO3, Nb2O5, MoO3, Ta2O5, WO3, and mixtures thereof, in a weighted quantity such that: 0.2%?2.43V2O5+8.84CrO3+1.66Nb2O5+6.14MoO3+Ta2O5+3.81WO3.

Abstract: The invention provides a novel fused and cast refractory product with a high zirconia content having improved electrical resistivity. Said refractory product comprises, as a percentage by weight relative to the oxides and for a total of more than 98.5%: ZrO2+Hf2O: >85% SiO2: 1% to 12% Al2O3: 0.1% to 2.4%, with Al2O3/SiO2<0.5 Y2O3: ?1%, B2O3: <1.5%; and a dopant selected from the group formed by V2O5, CrO3, Nb2O5, MoO3, Ta2O5, WO3, and mixtures thereof, in a weighted quantity such that: 0.2%?2.43V2O5+8.84CrO3+1.66Nb2O5+6.14MoO3+Ta2O5+3.

Abstract: The invention relates to a melted and cast refractory product which is intended, for example, for a checker work element of a glass furnace regenerator, having the following average chemical weight composition, expressed in weight percent based on oxide content: 0.4%<MgO<2.5%; 0.2%<SIO2<2%; CaO<0.4%; impurities<0.5% AL2O3: complement.

Abstract: An AZS type fused cast refractory product presenting the following chemical composition, as a percentage by weight: ZrO2: 15.5% to 22%; SiO2: 10.5% to 15%; Na2O+K2O+Li2O: 1.0% to 2.5%; impurities: <1%. Application to glass furnaces, in particular to the superstructures and crowns thereof.

Abstract: The invention concerns a refractory product comprising more than 85% of zirconia (ZrO2), characterized in that it comprises in wt. % with respect to oxides: ZrO2>92%, SiO2: 2 to 8%, Na2O: 0.12 to 1%, Al2O3: 0.2 to 2%, 0.5%?Y2O3+CaO?2.6%, with the proviso that Y2O3: 0.3 to 2% and that CaO: 0.5 to 1.93%.