… Slag wool, rock wool and similar mineral wools; exfoliated vermiculite, expanded clays, foamed slag and similar …
Explanatory notes
… - Other Slag wool and rock wool (e.g., of granite, basalt, limestone or dolomite) are obtained by melting one or more … these constituents and converting a stream of the resulting liquid into fibres, usually by centrifugal action and stream … into a mass of fibres. The mineral wools of this heading, like the glass wool of heading 70.19, have a flocculent or …