Abstract
1. The yield values of silica-gel greases are little affected by viscosity of the dispersion medium. 2. For silica-gel greases prepared from highly treated oils, the yield values decrease monotonically with temperature. For those prepared from less highly treated oils, an extremal relation is observed between yield value and temperature, with a maximum at 50 or 80°C. 3. Increasing the dispersion-medium viscosity improves the colloidal stability (oil separation) and increases the apparent viscosity of the greases. 4. Petroleum oil origin and type of treatment have no effect on the colloidal stability or apparent viscosity of silica-gel greases. 5. The relative thickening effect of hydrophobized silica gel increases as the dispersion-medium viscosity decreases.
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