Explanatory notes
… purpose (e.g., for spinning, felting, etc., or for use as filtering, insulating, packing, etc., materials). Crude … cellulose fibres, sawdust, pumice stone, talc, plaster, siliceous fossil earths, slag, aluminium oxide, glass … and often also with natural resins, plastics, sodium silicate, asphalt or rubber, etc. These articles may be made …