- It acts as a thickener.
- Presence of soap allows it to stick to the metal surfaces firmly and provides consistency.
- The nature of soap decides the temperature to which the greases can be used.
- It provides resistance to water, oxidation and breaking up of film on prolonged use. Thus, the nature of soap decides the working temperature, consistency, load-bearing capacity, resistance to water coefficient of friction.
- It remains in the dispersed phase and maintains the greases in the solid state.
- Sometimes, it provides viscosity to the greases.
- The nature of oil decides the viscosity of grease.
- It reduces the cost of grease.
- It provides heat cost grease to grease.
- Fillers like graphite , MoS2 etc adds to the lubricating property of greases.