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| Acid
Number |
A
measure of the amount of KOHL
needed to neutralize all or part
of the acidity of a petroleum
product. |
| Additive |
Any
material added to a base stock
to change its properties, characteristics
or performance. |
| Aniline
Point |
The
lowest temperature at which equal
volumes of aniline and hydrocarbon
fuel or lubricant base stock are
completely miscible. A measure
of the aromatic content of a hydrocarbon
blend, used to predict the solvency
of a base stock of the cetane
number of a distillate fuel. |
| Antifoam
Agent |
An
additive used to suppress the
foaming tendency of petroleum
products in service. May be a
silicone oil to break up surface
bubbles or a polymer to decrease
the number of small entrained
bubbles. |
| Antistatic
Additive |
An
additive that increases the conductivity
of a hydrocarbon fuel to hasten
the dissipation of electrostatic
charges during high speed dispensing,
thereby reducing the fire/explosion
hazard. |
| Antiwear
Agents |
Additives
or their reaction products, which
form thin, tenacious films on
highly loaded parts to prevent
metal-to-metal contact. |
| Apparent
Viscocity |
A
measure of the viscocity of an
non-Newtonian fluid under specified
temperature and shear rate conditions. |
| Ash |
Metallic
deposits formed in the combustion
chamber and other engine parts
during high temperature operation. |
| Ash
(Sulfated) |
The
ash content of an oil, determined
by charring the oil, treating
the residue with sulfuric acid,
and evaporating to dryness. Expressed
as % by mass. |
| Automatic
Transmission Fluid (ATF) |
The
ash content of an oil, determined
by charring the oil, treating
the residue with sulfuric acid,
and evaporating to dryness. Expressed
as % by mass. |
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