FIELD: chemistry.
SUBSTANCE: invention relates to glass and fibre compositions. The glass composition contains, wt %: SiO2 53-64; Al2O3 9-12; R2O 8.5-18; Fe2O3 less than 1, wherein the glass composition contains 0-3 wt % ZnO and R2O contains K2O in amount of 2-4 wt %. The composition also contains RO in an amount which provides the weight ratio R2O/RO in the range of about 0.15 to about 1.5.
EFFECT: high resistance to alkaline and acid corrosion and mechanical strength.
30 cl, 9 dwg
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