FIELD: organic chemistry. SUBSTANCE: ARTIFICIALLY prepared vitreous fibers have solubility at pH of 4.5 of least 20 nm day, viscosity of melt at 1400 C is 17-70 p. Fibers are formed from composition which comprises from 18 to 30 wt % of Al2O3; from 32 to 48 wt % of SiO2; from 10 to 30 wt % of MgO and from 5 to less than 10% of FeO. EFFECT: use of cheap starting materials. 19 cl, 1 tbl
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