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Groups of fine dust particles clinging together to form a larger particle.

Related Terms

SEQUESTER

To form a stable, water-soluble complex.

CUTTING WEAR

Comes about when hard surface asperities or hard particles that have embedded themselves into a soft surface and plough grooves into the opposing harder surface, e.g., a journal.

ISO SOLID CONTAMINANT CODE (ISO 4406)

A code assigned on the basis of the number of particles per unit volume greater than 5 and 15 micrometers in size. Range numbers identify each increment in the particle population throughout the spectrum of levels.

BALL BEARING

An anti-friction rolling type bearing containing rolling elements in the form of balls.

ADSORPTIVE FILTRATION

The attraction to, and retention of particles in, a filter medium by electrostatic forces, or by molecular attraction between the particles and the medium.

CLOUD POINT

The temperature at which waxy crystals in an oil or fuel form a cloudy appearance.

CRACKING

The process whereby large molecules are broken down by the application of heat and pressure to form smaller molecules.

AGGLOMERATE

The clustering together of a few or many particles into a larger solid mass.

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.

FATIGUE PLATELETS

Normal particles between 20 and 40 microns found in gear box and rolling element bearing oil samples observed by analytical ferrography. A sudden increase in the size and quantity of these particles indicates excessive wear.
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