Retorts, crucibles, mufflers, nozzles, plugs, supports, cupels, tubes, pipes, sheaths, rods, slide gates and other refractory ceramic goods, containing > 25 to 50% of free carbon (excl. refractory bricks, blocks, tiles and similar refractory ceramic constructional goods)
Retorts, crucibles, mufflers, nozzles, plugs, supports, cupels, tubes, pipes, sheaths, rods, slide gates and other refractory ceramic goods (excl. those of siliceous fossil meals or of similar siliceous earths, articles of heading 6902, articles containing carbon, alumina or silica of subheading 6903.10.00 and 6903.90.10)