The paper deals with an important technological aspect regarding vitreous materials: to determine the optimal composition for glass fibres with low biopersistence and with high chemical stability in service.

To reach this goal, in the first part of the study, according with requirements of a systemic approach, a technologic characterisation of these fibre types is made. Also the properties of interest (chemical stability, dissolution rate of the fibres) are selected based on fixed points of viscosity, both in terms of production technology and the glasses behaviour in different fields of use.