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| Bactericide |
Additive
to inhibit bacterial growth in
the aqueous component of fluids
preventing foul odors. |
| Bases |
Compounds
that react with acids to form
salts plus water. Alkalis are
water soluble bases used in petroleum
refining to remove acidic impurities.
Oil soluble bases are included
in lubricating oil additives to
neutralize acids formed during
the combustion of fuel or oxidation
of the lubricant. |
| Base
Number |
The
amount of acid (perchloric or
hydrochloric) needed to neutralize
all or part of a lubricant's basicity,
expressed as KOH equivalents. |
| Base
Oil Credit |
In
lubricant cost calculations, the
value of the base fluid displaced
by the additive package. |
| Base
Stock |
The
base fluid usually a refined petroleum
fraction or a selected synthetic
material, into which additives
are blended to produce finished
lubricants. |
| Bitumen |
Also
called asphalt or tar, bitumen
is the brown or black viscous
residue from the vacuum distillation
of crude petroleum. It also occurs
in nature as asphalt "lakes"
and "tar sands". It
consists of high molecular weight
hydro-carbons and minor amounts
of sulfur and nitrogen compound. |
| Black
Oils |
Lubricants
containing asphaltic materials
which impart extra adhesivness,
that are used for open gears and
steel cables. |
| Blow-by |
Passage
of unburned fuel and combustion
gases past the piston rings of
internal combustion engines, resulting
in fuel dilution and contamination
of the crankcase oil. |
| Boundary
Lubrication |
Lubrication
between two rubbing surfaces without
the development of a full fluid
lubricating film. It occurs under
high loads and requires the use
of antiwear or extreme pressure
(EP) additives to prevent metal-to-metal
contact. |
| 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 degree F or cSt at 100
degree C. |
| Brookfield
Viscosity |
Measure
of apparent viscosity of a non-Newtonian
fluid as determined by the Brookfield
viscometer at a controlled temperature
and shear rate. |
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