Selection, Function & Storage of Grease

Selection of Grease

Selection of grease are predicated on the following:

• Length of expected service.
• Expected temperature range of the application – cold or hot/low or high. Low-temperature applications can be handled by using smooth texture grease. A softer grease like NLGI 1 or 2 would assist the movement of the grease in the application. Remember high speeds – light oils: low speeds heavy oil.
• Speed of the application – slow or fast.
• Cost-effectiveness of the product for the applications.
• A load of the machine.

Functions of Grease

A satisfactory grease must:

• REDUCE friction and wear under various operating conditions.
• PROTECT against rust and corrosion.
• PREVENT dirt, water, and other contaminants from entering the parts being lubricated.
• MAINTAIN structure and consistency during long periods of use.
• PERMIT free motion of parts at low temperature and itself pump freely at those temperatures.

Storage of Grease

• The storage behavior of greases depends upon the viscosity of the base oil and the type and amount of thickener.
• The slight changes in the appearance of grease in storage have no effect on the performance of the product. Well-inhibited greases retain their quality in storage for many years.
• It is preferred to store grease in an indoor area and keep the container sealed. Use the oldest containers first and always clean grease handling equipment before using. Seal container tightly to avoid contamination.