The Basics of Greases


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Greases, mainly used for roller bearings, may be considered as semi-solid lubricants. The primary functions of greases are:

1.)  Reduce Friction

2.)  Minimize Wear

3.)  Seal against contaminants

4.)  Prevent Rust and Corrosion

Its pasty consistency (its non-flowing nature) allows for ease of application compared to oils.  One simply has to pack a bearing with grease, or dispense via a grease gun through a nipple.   Sumps, tubings, filters, coolers, and nozzles are typically not necessary, unlike with oils

bearing with grease and grease gun

Greases provide other advantages vs oils:

1.)  There is no lubricant drop-off at shut-down, preventing wear during start-up,

2.)  Greases provide noise and dampening owing to its consistency,

3.)  It acts as a strong seal or barrier against contaminants, and,

4.)  Leakages and throw-offs are minimized

On the other hand, greases cannot be used as a circulating oil, cannot generate force (hydraulic systems), and has a limited ability to absorb heat.

Greases may also be used with ball-screws, linear guides, open gears, journal bearings, gear couplings, and wire-ropes.

ball-screws, linear guides, open gears, journal bearings, gear couplings and wire-ropes.

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