Refractory bricks, blocks, tiles and similar refractory ceramic constructional goods, other than those of siliceous fossil meals or similar siliceous earths
Refractory bricks, blocks, tiles and similar refractory ceramic constructional goods containing, by weight, > 50% alumina, silica or a mixture or compound of these products (excl. those of siliceous fossil meals or similar siliceous earths)
Refractory bricks, blocks, tiles and similar refractory ceramic constructional goods containing, by weight, singly or together, > 50% of the elements mg, ca or cr, expressed as mgo, cao or cr2o3
Refractory bricks, blocks, tiles and similar refractory ceramic constructional goods (excl. containing, by weight, singly or together, > 50% of the elements mg, ca or cr, expressed as mgo, cao or cr2o3, containing, by weight, > 50% alumina, silica or a mixture or compound of these products and those of siliceous fossil meals or similar siliceous earths)