According to the Practical Handbook of Lubrication, grease is a lubricant composed of a fluid lubricant thickened with a material that contributes a degree of plasticity.
Greases are typically used in areas where a continuous supply of oil cannot be retained, such as open bearings or chassis components.
Grease Components
Greases are comprised of three essential components: a base fluid,a thickening system and an additive system. Different types and combinations of thickeners and base fluids, along with supplemental structure modifiers and performance additives, combine to give the final product its special lubricating properties. I like to use the analogy of a sponge saturated with oil.
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