… (for example, retorts, crucibles, muffles, nozzles, plugs, supports, cupels, tubes, pipes, sheaths, rods and slide …
Explanatory notes
… (for example, retorts, crucibles, muffles, nozzles, plugs, supports, cupels, tubes, pipes, sheaths, rods and slide … For the purpose of this subheading the term “free carbon” applies to carbon species such as graphite, amorphous carbon …