Other refractory ceramic goods (for example, retorts, crucibles, muffles, nozzles, plugs, supports, cupels, tubes, pipes, sheaths, rods and slide gates), other than those of siliceous fossil meals or of similar siliceous earths
Retorts, crucibles, mufflers, nozzles, plugs, supports, cupels, tubes, pipes, sheaths, rods and other refractory ceramic goods, containing > 50% alumina, or a compound of alumina and silica (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, containing by weight > 50% 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 similar siliceous earths, those of heading 6902, containing > 50% by weight of free carbon or containing > 50% by weight of alumina [al203] or a mixture or compound of alumina and silica [sio2])