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Abstract

A known method for producing synthetic quartz glass comprises the method steps of: forming a stream of a SiO₂ feedstock material which contains octamethylcyclotetrasiloxane (D4) as the main component which has a reference molecular mass assigned to it, feeding the stream to a reaction zone in which the feedstock material is converted under formation of amorphous SiO₂ particles by pyrolysis or hydrolysis into SiO₂, depositing the amorphous SiO₂ particles on a deposition surface while forming a porous SiO₂ soot body, and vitrifying the SiO₂ soot body while forming the synthetic quartz glass. Starting therefrom, to enable the production of large-volume cylindrical soot bodies with outer diameters of more than 300 mm of improved material homogeneity, it is suggested according to the invention that the feedstock material contains additional components in the form of further polyalkylsiloxanes, wherein light polyalkylsiloxanes with a relative molecular mass of less than the reference molecular mass are contained with a weight fraction of at least 50 ppm, and heavy polyalkylsiloxanes with a relative molecular mass of more than the reference molecular mass are contained with a weight fraction of at least 30 ppm.

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First Claim