Isolante termico costituito da un insieme di fili sottilissimi di vetro, realizzati trattando con vapore surriscaldato una massa fusa di scorie a base di coke e silicati. I fili hanno buona resistenza a trazione; il V. è impiegato per riempire intercapedi- ni di pareti, rivestire tubazioni (il liquido o il gas non deve superare i 300°C), ecc.
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