Properties of Lubricants.

 Here are the some important properties of lubricants.

• corrosion stability

• viscosity

• Aniline point

• flash & fire point

• Cloud & pour point

• Corrosion stability

Viscosity is a property which is offers resistance to flow and shear.If the viscosity is too low , a liquid oil film cannot be maintained two moving or sliding surfaces.in the other hand if the viscosity is very high , excessive force will result

Aniline Point

• It is the minimum equilibrium solution temperature for equal volumes of aniline and a lubricant oil sample.
• A lower aniline point of an oil means a higher percentage of aromatic hydrocarbons in it .
• A good lubricating oil should have high aniline point

Flash point and Fire point

• FLASH POINT – It is the lowest temperature at which the vapours that ignite for a moment,when a tiny flame is brought near it.
• FIRE POINT – It the lowest temperature at which the vapour of the lubricant oil burn continuously for at least five seconds,when a tiny flame is brought near it.

Cloud & Pour Point

 

            CLOUD POINT – When the lubricant oil is         cooled slow ,     the temperature at which it becomes   cloudy or hazy in appearance , is called its cloud point .

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•              POUR POINT – While the temperature at which   the lubricant oil cease to flow or pour , is called pour   point .