ISO

International Standards Organization, sets viscosity reference scales.


Related Terms

PISTON VISCOMETER

A device for the measurement of viscosity by the timed fall of a piston through the liquid being tested.

LIQUID SULFUR DIOXIDE-BENZENE PROCESS

A petroleum-refinery process using a mixed solvent (SO2 and benzene) to dewax lubricating oils or improve their viscosity indices.

LARAY VISCOMETER

An instrument designed to measure viscosity and other properties of ink.

JEANS VISCOSITY EQUATION

An equation which states that the viscosity of a gas is proportional to the temperature raised to a constant power, which is different for different gases.

HOT SPRAYING

A paint-spraying technique in which paint viscosity is reduced by heat rather than a solvent.

HYDRAULIC FLUID

Fluid serving as the power transmission medium in a hydraulic system. The most commonly used fluids are petroleum oils, synthetic lubricants, oil-water emulsions, and water- glycol mixtures. The principal requirements of a premium hydraulic fluid are proper viscosity, high viscosity index, anti-wear protection (if needed), good oxidation stability, adequate pour point, good demulsibility, rust inhibition, resistance to foaming, and compatibility with seal materials. Anti-wear oils are frequently used in compact, high-pressure, and capacity pumps that require extra lubrication protection.

BRIGHT STOCK

A heavy residual lubricant stock with low pour point, used in finished blends to provide good bearing film strength, prevent scuffing, and reduce oil consumption. Usually identified by its viscosity, SUS at 210°F or cSt at 100°C.

FLUID FRICTION

Friction due to the viscosity of fluids.

BROOKFIELD VISCOSITY

Apparent viscosity in cP determined by Brookfield viscometer, which measures the torque required to rotate a spindle at constant speed in oil of a given temperature. Basis for ASTM Method D 2983; used for measuring low temperature viscosity of lubricants.

ISO VISCOSITY GRADE

A number indicating the nominal viscosity of an industrial fluid lubricant at 40°C (104°F) as defined by ASTM Standard Viscosity System for Industrial Fluid Lubricants D 2422. Essentially identical to ISO Standard 3448.

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