Hollow glass spheres

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C - Chemistry, Metallurgy

03

C

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C03C 12/00 (2006.01) C03C 3/078 (2006.01) C03C 3/085 (2006.01) C03C 3/087 (2006.01) C03C 3/091 (2006.01) C03C 3/093 (2006.01) C03C 3/097 (2006.01) C03C 11/00 (2006.01)

Patent

CA 1335297

Hollow glass spheres having average densities of approximately .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: SiO2(50 to 57%); R2O(2 to 15%); B2O3(0 to 20%); S(.05 to 1.5%); RO(2 to 25%); RO2(other than SiO2) (0 to 5%); R2O3(other than B2O3) (0 to 10%); R2O5(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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