I-Slag wool iyi-fiber ye-inorganic efana nekotini eyenziwe nge-slag yemfucuza yezimboni (i-blast furnace slag), i-basalt, i-diabase, i-dolomite, njll., encibilika ekushiseni okuphezulu kwe-1450 ° C futhi iphothwe ukuphotha kwe-centrifugal ngesivinini esikhulu. Kwenziwe ngobude obunqunyiwe, ukususwa kwe-slag, ukwelashwa kwendawo nezinye izinqubo