CLASS-FORMING SILICATE MINERALS AND THEIR DERIVED CHEMICAL-COMPOSITIONS - CHARACTERIZATION OF THE ALKALI RESISTANCE OF THE PREPARED COMPACTCLASSES AND DETERMINATION OF PHYSICAL-PROPERTIES WITH REGARD TO THEIRUSE AS FIBERS OR FOAMED CLASSES

29 glasses from natural raw materials and silicate wastes were prepare d and analysed and their glass properties were measured: transformatio n temperature T-g [degrees C], linear thermal coefficient of expansion (20/300 C) [10(-6)/K], hydrolytic resistance according to DIN ISO 719 and alkali resistance according to DIN 52 322. The chemical compositi on of the glass is based on the components SiO2, Al2O3, Fe2O3, TiO2, C aO, MgO, MnO, K2O, Na2O, P2O5, C-org, SO3 and H2O. The values of the b asic chemical characteristics B-cc of the glasses, expressed by the qu otient of basic (RO + R(2)O) and acidic (RO(2) + R(2)O(3)) components, are between 0.97 and 0.12. Values determined for alkali resistance of treated glasses in aqueous solutions of NaOH and Na2CO3 (loss of weig ht) ranged from 71.60 to 257.55 mg/dm(2), which corresponds to the val ues of the classification of the alkali resistance from 1 to 3.