Retorts crucibles mufflers nozzles plugs supports cupels tubes pipes sheaths rods and other refractory ceramic goods containing by weight 50 graphite other carbon or a mixture thereof excl refractory bricks blocks tiles and similarrefractory ceramic constructional goods

Could you correct the punctuation please?
Retorts, crucibles, mufflers, nozzles, plugs, supports, cupels, tubes, pipes, sheaths, rods and other refractory ceramic goods, containing, by weight, > 50% graphite, other carbon or a mixture thereof (excl. refractory bricks, blocks, tiles and similarrefractory ceramic constructional goods)