| 摘要 |
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 HCl, 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. |
