FIELD: manufacture of fibrous blanks for quartz light conduits used in communication lines.
SUBSTANCE: method consists in coaxially placing the pre-blank containing core inside tube made from quartz glass, filling the gap between them with quartz grist and fusion. Grist taken in the amount equal to 20-70% of mass of blank is preliminarily subjected to gas phase cleaning with NH4Cl vapor at temperature above 337°C. Fusion is effected at pressure inside tube below atmospheric.
EFFECT: possibility of producing blanks having mass more than 1 kg by means of horizontal thermal and mechanical machines.
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