FIELD: manufacture of building materials. SUBSTANCE: invention concerns fibers predominantly of glass and basalt. Apparatus contains melting chamber of refractory material with orifice plate of platinum alloy and, placed inside the chamber, platinum alloy heater executed in the form of shaped perforated screen separating melting chamber over its cross-section, ratio of distance between lower edge of heater and inner surface of orifice plate to height of melting chamber being 0.25 to 0.75. EFFECT: improved structure. 1 dwg
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