6902 Refractory bricks, blocks, tiles and similar refractory ceramic constructional goods (excl. those of siliceous fossil meals or similar siliceous earths)

6902 (01/1988-..) Refractory bricks, blocks, tiles and similar refractory ceramic constructional goods (excl. those of siliceous fossil meals or similar siliceous earths) 69021000 (01/1988-..) 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 69022010 (01/1988-..) Refractory bricks, blocks, tiles and similar refractory ceramic constructional goods containing, by weight, >= 93% silica (excl. those of siliceous fossil meals or similar siliceous earths) 69022091 (01/1988-..) Refractory bricks, blocks, tiles and similar refractory ceramic constructional goods containing, by weight, > 7% but < 45% alumina, but > 50% by weight combined with silica 69022099 (01/1988-..) 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. containing, by weight, >= 93% silica, > 7% but < 45% alumina and those of siliceous fossil meals or similar siliceous earths) 69029000 (01/1988-..) 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)