Heraeus Quarzglas Gmbh & Co Kg

Gerhard Kotulla

Klaus Ruppert

The invention relates to a method for producing a silica glass tube which is characterized by depositing SiOparticles on an elongate support that rotates about its longitudinal axis, thereby producing a porous with a cylindrical inner bore. Said blank is vertically aligned, suspended in a furnace using a suspension that engages with a constriction in the upper zone of the inner bore of the blank, and vitrified. The aim of the invention is to provided a method with which also heavy blanks can be secured safely and substantially without any danger of contaminations of the inner bore without using complicated securing devices. To this end, the constriction () is generated by shaping the inner bore () when the SiOparticles are deposited. For vitrification a suspension () is used that supports itself on the constriction () and that otherwise projects into the cylindrical inner bore () without having any contact therewith.

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Hanau, Germany

Gerhard Kotulla