Grease is a thickened lubricant that remains in contact with moving surfaces. It is formulated from a base oil thickened with a soap, clay, or polymer. Grease properties depend on the base oil viscosity and consistency grade determined by penetration testing. Additives provide oxidation resistance, extreme pressure properties, anti-wear performance, and other characteristics. Standard tests evaluate grease properties like dropping point, oil separation, load carrying capacity, and resistance to water and corrosion. Proper grease selection depends on application parameters like temperature, speed, and load.
9. Base Oil Viscosity
VISCOSITY APPLICATION
ISO 15 ‐ 32 Used for high speeds (>3600 rpm), lower loads, good at
low temperatures
ISO 68 ‐ 100 Used for high speeds (>3600 rpm), lower loads, higher
temperatures
ISO 100 ‐ 220 Moderate speeds (<3600 rpm), good load carrying,
typical multi‐purpose grease’s oil
ISO 460 Medium speeds, high load carrying
ISO 1000 ‐ 1500 Slow speeds (<100 rpm), excellent load carrying