Patent ID: 11952303
Assignee: HERAEUS QUARZGLAS GMBH & CO. KG
Field: Measurement (Instruments)
Classification: CPC C  B  G  H  Y | IPC B  C  G  H

Claim 16:
17. The process of forming the quartz glass body according to claim 1, wherein the quartz glass body has at least one of the following features:
a chlorine content of less than 200 ppm;
an aluminium content of less than 200 ppb;
an ODC content of less than 5*1015/cm3;
a metal content of metals different from aluminium of less than 1 ppm;
a viscosity (p=1013 hPa) in a range from log 10 (η (1250° C.)/dPas)=11.4 to log 10 (η (1250° C.)/dPas)=12.9 or log 10 (η (1300° C.)/dPas)=11.1 to log 10 (η (1300° C.)/dPas)=12.2 or log 10 (η (1350° C.)/dPas)=10.5 to log 10 (η (1350° C.)/dPas)=11.5;
a refractive index homogeneity of less than 10−4;
a standard deviation of the OH content of not more than 10%, based on the OH-content A] of the quartz glass body;
a standard deviation of the Cl content of not more than 10%, based on the Cl content B] of the quartz glass body;
a standard deviation of the Al content of not more than 10%, based on the Al content C] of the quartz glass body;
a cylindrical form;
a tungsten content of less than 1000 ppb; and
a molybdenum content of less than 1000 ppb,, wherein the wt.-%, ppb and ppm are each based on the total weight of the quartz glass body.