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 13:
14. The process according to claim 1, wherein the silicon dioxide powder comprises at least one of the following:
a BET surface area in a range from 20 to 60 m2/g;
a bulk density in a range from 0.01 to 0.3 g/cm3;
a carbon content of less than 50 ppm;
a chlorine content of less than 200 ppm;
an aluminium content of less than 200 ppb;
a total metal content of metals different to aluminium of less than 1,000 ppb;
at least 70 wt.-% of the powder particles have a primary particle size in a range from 10 to 100 nm;
a tamped density in a range from 0.001 to 0.3 g/cm3;
a residual moisture content of less than 5 wt.-%;
a particle size distribution D10 in the range from 1 to 7 μm;
a particle size distribution D50 in the range from 6 to 15 μm; and
a particle size distribution D90 in the range from 10 to 40 μm;, wherein the wt.-%, ppm and ppb are each based on the total weight of the silicon dioxide powder.