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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,

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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A metal organic gel adapted for use as a starting material in the manufacture of hollow glass microspheres, said gel having an oxide equivalent glass composition consisting essentially of oxides of boron in the amount of about 4% to 10%, potassium in the amount of about 8% to 15%, sodium in the amou

A metal organic gel adapted for use as a starting material in the manufacture of hollow glass microspheres, said gel having an oxide equivalent glass composition consisting essentially of oxides of boron in the amount of about 4% to 10%, potassium in the amount of about 8% to 15%, sodium in the amount of about 1% to 10% and the remainder silicon, with a ratio of potassium to sodium in excess of 1.5, and which, when crushed and sieved to a particle size in the range of about 106 m125 m1500°C. in the presence of water vapor, is characterized by a silica concentration in excess of 99%. In a hollow glass microsphere consisting essentially of oxides of silicon, boron, potassium and sodium, the improvement wherein the concentration in mole percent of said oxide of silicon is at least 99%.