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23.20.12 - Refractory bricks, blocks, tiles and similar refractory ceramic constructional goods, other than of siliceous fossil meals or earths
23.20.12.10 - Refractory ceramic constructional goods containing >50 % of MgO, CaO or Cr2O3 including bricks, blocks and tiles excluding goods of siliceous fossil meals or earths, tubing and piping
23.20.12.33 - Refractory bricks, blocks..., weight > 50 % Al2O3 and/or SiO2: ≥ 93 % silica (SiO2)
23.20.12.35 - Refractory bricks, blocks, tiles and similar refractory ceramic constructional goods containing, by weight, > 7 % but < 45 % alumina, but > 50 % by weight combined with silica
23.20.12.37 - Refractory bricks, blocks..., weight > 50 % Al2O3 and/or SiO2: others
23.20.12.90 - Refractory bricks, blocks, tiles, etc., n.e.c.
Refractory bricks, blocks, tiles and similar refractory ceramic constructional goods, other than of siliceous fossil meals or earths
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