| Lithium Base Grease -
A grease prepared from a lubricating fluid thickened
with Lithium soap.
Bentone Grease - A grease prepared
from a lubricating fluid thickened with bentone
clay.
Aluminum Base Grease - A grease
prepared from a lubricating fluid thickened with
aluminum soap.
A.P.I. Gravity - An arbitrary
scale established by the American Petroleum
Institute related to the Specific gravity of
petroleum oil in accordance with the formula,
Degrees A.P.I. = 141.5 - 131.5
Specific Gravity 60F/60F
Corrosion - Destruction of a metal
by chemical or electrochemical reaction with its
environment.
Dropping Point (Of Grease) - The
temperature at which a grease passes from a
semisolid to a liquid state under specified test
conditions.
EP (Extreme Pressure) Lubricants -
Lubricants that impart to
rubbing surfaces the ability of carrying appreciably
greater loads
than would be possible with ordinary lubricants
without excessive wear or damage.
Fire Point - The temperature to
which a combustible liquid must be heated so that
the released vapor will burn continuously when
ignited under specified conditions.
Flash Point - The temperature to
which a combustible liquid must be heated to give
off sufficient vapor to form momentarily a flammable
mixture with air when a small flame is applied under
specified conditions.
ISO - Abbreviation for
International Standards Organization.
Kinematic Viscosity - The absolute
viscosity of a fluid divided by its mass density.
Standard unit kinematic viscosity is the stoke and
is expressed in cm 2/sec.
Oxidation Stability - The
resistance of lubricants to chemical reaction with
oxygen. The absorption and reaction of oxygen may
lead to deterioration of lubricants.
Penetration - An arbitrary measure
of consistency. All penetration measurements are in
an inverse scale of consistency - that is, the
softer the consistency, the higher the penetration
number.
Worked Penetration - is the
penetration of sample of lubricating greases
immediately after it has been brought to 77 degrees
F. an then subjected to 60 strokes in a standard
grease worker.
Unworked Penetration - is the
penetration at 77 degrees F. of a sample of
lubricating grease which has received only the
minimum handling in transfer from sample can to test
apparatus and which has not been subjected to the
action of a grease worker.
Pour Point - The lowest
temperature at which a lubricant will pour or flow
under specified conditions.
Saybolt Universal Viscosity (SUV)
or saybolt Universal Seconds (SUS) - The time in
seconds required for 60 cubic centimeters of a fluid
to flow through the orifice of the standard Saybolt
Universal Viscometer at a given temperature.
Specific Gravity - The ratio of
the weight in air of a given volume of a material to
the weight in air of an equal volume of water at a
stated temperature.
Synthetic Lubricant - A lubricant
produced by synthesis rather than by extraction or
refinement.
Total Acid Number - The quantity
of base, expressed in milligrams of potassium
hydroxide, that is required to neutralize all basic
constituents present in 1 gram of sample.
Total Base Number - the quantity
of acid, expressed in terms of the equivalent number
of milligrams of potassium hydroxide, that is
required to neutralize all basic constituents
present in 1 gram of sample.
Viscosity - That property of a
fluid, semifluid or semisolid substance that causes
it to resist flow. It is defined as the shear stress
on a fluid element divided by the rate of shear.
Viscosity Index (VI) - a commonly
used measure of a fluid’s change of viscosity with
temperature. The higher the viscosity index, the
smaller the relative change in viscosity with
temperature.
Water Corrosion Resistance - The
ability of a lubricating grease to prevent corrosion
of surfaces when water is present in the lubricating
system. May be measured either statically by any of
a number of standard tests, or dynamically by actual
operation of bearings with water added to the
lubricant reservoir.
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