C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
261/2, 49/77
C03C 11/00 (2006.01) C03B 19/10 (2006.01)
Patent
CA 1117988
ABSTRACT A process of making cellulated glass beads by forming a mixture comprising glass particles and cellulating agent into nodules, heat treating the nodules to cause fusion of glass and evolution of gas from the cellulating agent to form cellulated glass beads, and cooling the cellulated glass beads to a rigid condition. The cellulating agent utilized has the characteristic of creating expansion forces due to the evolution of gas during heat treatment which are generated wholly or mainly while the glass viscosity is within the range 106.5 to 108.5 poises. The heat treatment is carried out with a quantity of cellulating agent at a maximum cellulation temperature which is not above the temperature corresponding with a glass viscosity of 105.5 poises and for a time such that the beads immediately following the heat treatment are populated with cells, and after cooling have a bulk density of not more than 0.5g/cm3 and a water-permeability of less than 15% by volume determined by measuring the volume of water absorbed by the cellulated glass beads when immersed in water at room temperature for a period of 24 hours.
303637
Florean Jean
Glineur Michel
Taupin Pierre
Bfg Glassgroup
Swabey Ogilvy Renault
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