Glass bubbles of increased collapse strength

Compositions: coating or plastic – Coating or plastic compositions – Metal-depositing composition or substrate-sensitizing...

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501 33, 501 65, C04B 3102, C03C 1300

Patent

active

043916465

ABSTRACT:
Glass bubbles of increased collapse strength are prepared. The bubbles have an average particle density of 0.4 or more and are made of glass that consists essentially of SiO.sub.2 (60-90 weight-percent), alkali metal oxide (2-20 weight-percent), B.sub.2 O.sub.3 (1-30 weight-percent), sulfur (0.005 to 0.5 weight-percent), and other conventional glass-forming ingredients.

REFERENCES:
patent: 3129086 (1964-04-01), Veatch et al.
patent: 3230064 (1966-01-01), Veatch et al.
patent: 3365315 (1968-01-01), Beck et al.
M. A. Krenzke and R. M. Charles ("Elastic Buckling Strength of Spherical Glass Shells, " David Taylor Model Basin Report No. 1759, Sep. 1963).

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