… plugs, supports, cupels, tubes, pipes, sheaths, rods and slide gates), other than those of siliceous fossil meals …
Explanatory notes
… plugs, supports, cupels, tubes, pipes, sheaths, rods and slide gates), other than those of siliceous fossil meals … more than 50 % of alumina (Al 2 O 3 ) or of a mixture or compound of alumina and of silica (SiO 2 ) 6903.90 - Other … vessels, crucibles, cupels and similar articles for industrial or laboratory use, muffles, nozzles, plugs, …