Hollow glass spheres

Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...

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501 39, 501 57, 501 58, 501 59, 501 63, 501 67, 501 68, 501 69, 501 70, 501 72, 524494, C03C 1200

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052179281

ABSTRACT:
Hollow glass spheres having average densities of approximately 0.10 grams/cc to approximately 2.0 grams/cc are prepared by heating solid glass particles. The glass spheres consist essentially of the following ingredients in the following amounts stated as weight percentages: SiO.sub.2 (50 to 57%); R.sub.2 0(2 to 15%); B.sub.2 O.sub.3 (0 to 20%); S(0.05 to 1.5%); RO(2 to 25%); RO.sub.2 (other than SiO.sub.2) (0 to 5%); R.sub.2 O.sub.3 (other than B.sub.2 O.sub.3) (0 to 10%); R.sub.2 O.sub.5 (0 to 5%); and F(0 to 5%). R represents a metal or an element like phosphorous which combines with oxygen in glass. The sizes of the hollow glass spheres are selected to produce a maximum average strength for a desired average density.

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Chemical Abstracts 88: 196379Q (1978).
Chemical Abstracts 109: 1065OV (1988).

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