| 摘要 |
There is disclosed a concentrated stable alkaline silica sol having a pH of from 7.0 to 10.0 consisting essentially of from 35% to 70% by weight of large, spherical, uniform, non-aggregated silica particles having a weight-average particle diameter of about 45 to about 100 millimicrons and water as the hydrophilic liquid carrier of said particles, said sol at a 50% silica concentration having a viscosity of less than 10 cps at 25 DEG C. and a specific conductance of less than 5000 micromhos/cm.
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