Gas-filled glass beads

Details Gas-filled glass beads Gas-filled glass beads

B - Operations, Transporting

01

J

52/49, 117/46.2

B01J 13/02 (2006.01) C03B 19/10 (2006.01) C03C 11/00 (2006.01) C03C 15/00 (2006.01) C06B 23/00 (2006.01)

Patent

CA 1242614

ABSTRACT GAS-FILLED GLASS BEADS A method of producing gas filled hollow glass beads comprises the steps of: i. manufacturing hollow glass beads having an alkali content of at least 20% calculated as weight per cent of oxide in the bead, ii. exposing the beads to an acidic treatment medium, for example HC1, HNO3, H2SO4, SO2, SO3, to reduce the alkali content of the beads to not more than 15%, and iii. causing gas to diffuse into the beads.

454054

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