Glass fibers of superior physical properties are produced by drawing at a temperature between about 1250 DEG and 1350 DEG C a melt consisting essentially ZnO-MgO-Al2O3-SiO2-TiO2 of the following approximate composition by weight: }ZnO 15 to 23 % }SiO2 43 to 52 % }Al2O3 15 to 23 % }MgO 7 to 12 % }TiO2 3 to 7 %. } The fibers are especially suited for use as a reinforcement in a plastic, plaster, cement or low-melting metal structure.
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