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A method which involves placing a drop of fluid on a permeable piece of paper and noting the development and nature of the halos, or rings, surrounding the drop through time. The roots of this test can be traced to the 1940s, when railroads used the 'blotter spot' tests.

Related Terms

ROTARY COMPRESSOR

Mechanism which pumps fluid by using rotating motion.

BUBBLE POINT

The differential gas pressure at which the first steady stream of gas bubbles is emitted from a wetted filter element under specified test conditions.

CUTTING FLUID

Any fluid applied to a cutting tool to assist in the cutting operation by cooling, lubricating or other means.

FILTER MANIFOLD

A filter assembly containing multiple ports and integral relating components which services more than one fluid circuit.

ANALYTICAL FERROGRAPHY

The magnetic precipitation and subsequent analysis of wear debris from a fluid sample .This approach involves passing a volume of fluid over a chemically treated microscope slide which is supported over a magnetic field. Permanent magnets are arranged in such a way as to create a varying field strength over the length of the substrate. This varying strength causes wear debris to precipitate in a distribution with respect to size and mass over the Ferrogram. Once rinsed and fixed to the substrate, this debris deposit serves as an excellent media for optical analysis of the composite wear particulates.

EFFLUENT

The fluid leaving a component.

A.S.T.M.

American Society for Testing Materials - a society for developing standards for materials and test methods.

COOLANT

A fluid used to remove heat. See Cutting fluid.

ATF

Fluid for automatic, hydraulic transmissions in motor vehicles.

DEMULSIBILITY

The ability of a fluid that is insoluble in water to separate from water with which it may be mixed in the form of an emulsion.
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