Measure of the ability of an added component (for example, tetraethyllead, isooctane, and aromatics) to affect the octane rating of a base gasoline stock.
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DIELECTRIC STRENGTH
A measure of the ability of an insulating material to withstand electric stress (voltage) without failure. Fluids with high dielectric strength (usually expressed in volts or kilovolts) are good electrical insulators. (ASTM Designation D 877.)
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HYDROFINISHING
A process for treating raw extracted base stocks with hydrogen to saturate them for improved stability.
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MOAT
An annular depression that may not be continuous, located at the base of many sea mounts, islands, and other isolated elevations of the sea floor, analogous to the moat around a castle.
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COPPER STRIP CORROSION
A qualitative measure of the tendency of a petroleum product to corrode pure copper.
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AIR BREATHER
A device permitting air movement between atmosphere and the component in/ on which it is installed.
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SALINITY
A measure of the concentration of dissolved mineral substances in water.
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GROUND FOG
A fog that obscures less than six tenths of the sky, and does not extend to the base of any clouds
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HOUR-GLASS EFFECT
A radarscope phenomenon which appears as a constriction or expansion of the display near the center of the plan position indicator, which can be caused by a nonlinear time base or the sweep plot starting on the radar indicator at the same instant as the transmission of the pulse. The phenomenon is most apparent when in narrow rivers or close to shore.
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BASE
A material which neutralizes acids. An oil additive containing colloidally dispersed metal carbonate, used to reduce corrosive wear.
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ASH
A measure of the amount of inorganic material in lubricating oil. Determined by burning the oil and weighing the residue. Results expressed as percent by weight.
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