Royal Manufacturing - Industrial Greases and Lubrication

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ROYAL
Tulsa Plant
516 S. 25th West Ave.
Tulsa, OK 74127 USA
918.584.2671 918.592.6472
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Schertz Plant
(San Antonio Metro)
9998 Doerr Lane
Schertz, TX 78154 USA
210.651.7322 210.651.7405
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Glossary

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- D -

Demulsibility The ability of a non-water-miscible fluid to separate from water with which it may be mixed. The higher the demulsibility rating, the more rapidly the fluid separates from water. Demulsibility is sometimes expressed as the rate, in cubic centimeters per hour, or settling our of a fluid from an emulsion under specified conditions. See Steam Emulsion Number.

Density The mass of a unit volume of a substance. Its numerical value varies with the units used.

Detergent In lubrication, either an additive or a compounded lubricant having the property of keeping insoluble matter in suspension thus preventing its deposition where it would be harmful. A detergent may also re-disperse deposits already formed.

Dewaxing Process which removes wax from a lube distillate by solvent means (physical separation) or catalytic means (conversion).

Dielectric Strength A measure of the ability of an insulating fluid to withstand the electric stress (voltage) without failure. Fluids with high dielectric strength (usually expressed in volts or kilovolts) are good electrical insulators.

Dispersing In lubrication, usually used interchangeably with detergent. An additive which keeps fine particles of insoluble materials in a homogeneous solution. Hence, particles are not permitted to settle out and accumulate.

Distillate A term applied to a liquid collected when condensing distilled vapors such as naphtha, kerosene, fuel oil and light lubricating oils.

Drop Feed Lubrication – A system of lubrication in which the lubricant is applied to the bearing surfaces in the form of drops at regular intervals.

Dropping Point of Grease The temperature at which a grease passes form a semi-solid to a liquid state under specified test conditions.

Dynamic Viscosity See Absolute Viscosity.

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