Biodegradable lubricants are those products that decompose or transform in the environment due to the action of organisms or their enzymes (found in groundwater or soil). A lubricant is defined as biodegradable if it contains <10% by weight oxygen content and undergoes ≥60% biodegradation as theoretical CO2 in 28 days and ≥67% biodegradation as theoretical O2 uptake in 28 days in laboratory testing. Biodegradable products should not be confused with food grade.

The separation of liquid from a lubricating grease.

Blending is the process of mixing components to produce a mixture with desired properties.

The surface color (usually blue or green) of a lubricating oil or grease when viewed by reflected daylight at an angle of about 45 degrees from the surface. Bloom is associated with the absorption of ultraviolet light in the oil and may not be visible if the sample is viewed using artificial light.

See Lubrication.

Visual appearance of grease when the undisturbed surface is viewed in an opaque container. See also Texture. Bulk Appearance should be described in the following terms-

• Bleeding – Free oil on the surface or in the cracks of grease.
• Cracked – Surface cracks
• Grainy – Small granules or lumps of thickener or additive particles.
• Rough – Many small irregularities.
• Smooth – Relatively free of irregularities.