… mineral wools; exfoliated vermiculite, expanded clays, foamed slag and similar expanded mineral materials; mixtures …
Explanatory notes
… mineral wools; exfoliated vermiculite, expanded clays, foamed slag and similar expanded mineral materials; mixtures … melting one or more of these constituents and converting a stream of the resulting liquid into fibres, usually by … varying proportions, sometimes with the addition of small amounts of other oxides such as zirconia, chromia or boric …