16 items found. For further information on glossary terms contact us

PAO Chemicals

Polyalphaolefin, synthetic oil. Compared to mineral oils these oils are more resistant to heat and oxidation. Better for low temperature starting and offering higher oil film strength which improves protection for components.

Paraffin Chemicals

Hydrocarbons belonging to the series starting with methane (CH4). Paraffins are saturated with respect to hydrogen. High molecular weight paraffins are solid such as paraffin wax.

Particle Chemicals

A minute piece of matter with observable length, width and thickness, usually measured in micrometers.

PCV (Positive Crankcase Ventilation) Valve Engine Parts

An emissions control device that allows gases from the crankcase to be reintroduced into the intake.

Penetration Parameters

A test in which a cone is dropped into a grease sample to measure the penetration or how hard or soft the grease is at room temperatures. The cone penetrates farther in a soft grease and therefore has a higher penetration number. This penetration relates

pH Parameters

A measure of acidity or alkalinity. Values of pH run from 0-14; 7 indicating neutrality, numbers less than 7 indicate increasing acidity, and numbers greater than 7 indicate increasing alkalinity.

Pitting Processes

Surface cavities, may be related to fatigue, overload or corrosion.

Pneumatics Processes

Engineering science pertaining to gaseous pressure and flow.

Poise Parameters

Unit of viscosity, defined by the shear stress required to move one layer of fluid along another over a total thickness of one centimetre at a velocity of one centimetre per second. This viscosity is independent of fluid density, and directly related to f

Polishing (bore) Processes

Excessive smoothing of the surface finish of the cylinder bore or cylinder liner in an engine to a mirror-like appearance, resulting in depreciation of ring sealing and oil consumption performance.

Polymerization Processes

Chemical combination of similar type molecules to form larger molecules.

Pour Point Parameters

Is a widely used low-temperature flow indicator and is 3°C above the temperature at which a normally liquid petroleum product maintains fluidity. It is a significant factor in cold-weather start-up, but must be considered along with pumpability, the ease

Pour Point Depressant Chemicals

Additive used to lower the pour point or lower the temperature fluidity of a petroleum product.

Preignition Engine Performance

Ignition of the fuel/air mixture in a gasoline engine before the spark plug fires. Often caused by incandescent fuel or lubricant deposits in the combustion chamber, it wastes power and may damage the engine.

Propylene Glycol Chemicals

A non-toxic liquid used as a coolant/antifreeze in cooling and heating systems.

Pumpability Properties

The low temperature, low shear stress-shear rate viscosity characteristics of an oil that permit satisfactory flow to and from the engine oil pump and subsequent lubrication of moving components.

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