| abstract |
Sintered refractory product having the shape of a block and consisting of - a granulate consisting of all the grains having a size greater than 100 microns, called "coarse grains", and - a matrix bonding said coarse grains and constituted grains having a size less than or equal to 100 μm, the aggregate representing between 45% and 90% by weight of the product, said product having a composition such that, in weight percent on the basis of the oxides: Al 2 O 3> 80%, SiO 2 <15%, - Na 2 O <0.15% - Fe 2 O 3 <0.05%, - CaO <0.1%, - the other oxides constituting the 100% complement. |