FIELD: physics.
SUBSTANCE: method enables to adjust the diameter of a workpiece by depositing a layer of especially pure quartz glass. The method includes high-temperature heating of a workpiece with an oxyhydrogen torch in the flame of which tetraethoxysilane vapour is fed. Tetraethoxysilane is fed via saturation thereof with oxygen vapour which is bubbled through liquid tetraethoxysilane.
EFFECT: reduced loss of workpiece glass due to evaporation thereof at high temperatures of the production process thereof.
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