Hollow microspheres of silica glass and method of manufacture
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United States of America Patent
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Jun 22, 1982
Grant Date -
N/A
app pub date -
Aug 15, 1980
filing date -
Aug 15, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of manufacturing gel powder suitable for use as a starting material in the manufacture of hollow glass microspheres having a high concentration of silica. The powder is manufactured from a gel containing boron in the amount of about 1% to 20% (oxide equivalent mole percent), alkali metals, specifically potassium and sodium, in an amount exceeding 8% total, and the remainder silicon. Preferably, the ratio of potassium to sodium is greater than 1.5.
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