Properties of Lubricants | Lubricants Properties | Lubricants | What is the properties of Lubricants ? | How many properties of lubricants ? | Qualities of lubricants |
-: Lubricants :-
Lubricants is defined as - A substance which is used to reduce friction and heat generated between surfaces when surfaces moves by mutual contact is known as lubricants .
For any machine it is necessary to use a good lubricant.
-: Properties of Lubricants :-
A good lubricants should be contain following properties -
1- Viscosity
2- Flash point
3- Fire point
4- Cloud Point
5- Pour point
6- Oiliness
7- Corrosion
8- Emulsification
9- Physical stability
10- Chemical Stability
11- Neutralization number
12- Specific gravity
13- Adhesiveness
14- Film strength
1- Viscosity :- The ability of the oil to resists internal deformation due to mechanical stress is known as viscosity of oil . In other words , Viscosity is a measure of the ability of the oil film to carry a load .
Viscosity varies with the temperature and hence if a surface to be lubricated is normally at high temperature it should be supplied with oil of a higher viscosity .
Properties of Lubricants / Lubricants Properties
2- Flash Point :- The lowest temperature at which the lubricating oil will flash , when a small flame is passed across its surface , is known as the flash point of the lubricating oil .
The flash point of the should be sufficiently high so as to avoid flashing of oil vapours at the temperatures occurring in common use . High flash point oils are needed in air compressors .
3- Fire Point :- The lowest temperature at which the oil burns continuously , is known as fire point . The fire point also must be high in a lubricating oil , so that oil does not burns in service .
Properties of Lubricants / Lubricants Properties
4- Cloud point :- The temperature at which lubricating oil starts solidifying which makes it to appear cloudy , is known as cloud point .
5- Pour Point :- The lowest temperature at which the lubricating oil will pour is known as pour point of lubricating oil .
This property must be considered because of its effect on starting an engine in cold weather and on free circulation of oil through exterior feed pipes when pressure is not applied .
6- Oiliness :- The property which enables oil to spread over and adhere to the surface of the bearing is known as oiliness of lubricating oil .
7- Corrosion :- A lubricant should not corrode the working parts and it must retain its properties even in the presence of foreign matter and additives .
8- Emulsification :- When a lubricating oil mixed with water and losses its lubricating properties , then this is known as emulsification .
The emulsification number is an index of the tendency of an oil to emulsify with water .
Properties of Lubricants / Lubricants Properties
9- Physical Stability :- A lubricating oil must be stable physically at the lowest and highest temperatures between which the oil is to be used . At the lowest temperatures there should not be any separation of solids , and at the highest temperatures it should not vapourise beyond a certain limit .
10-Chemical Stability :- A lubricating oil should also be stable chemically . There should not be any tendency for oxide formation .
11- Neutralization Number :- An oil may contain certain impurities that are not removed during refining . The neutralization number test is a simple procedure to determine acidity or alkalinity of an oil .
Properties of Lubricants / Lubricants Properties
12- Specific Gravity :- Specific gravity is a measure of density of lubricating oil . It is an indication regarding the grade of lubricant by comparing one lubricant with other . It is determined by a hydrometer which floats in the oil, and the gravity is read on the scale of the hydrometer at the surface of the oil .
13- Adhesiveness :- The property of lubricating oil due to which the oil particles stick with the metal surfaces is known as adhesiveness .
14- Film Strength :- The property of a lubricating oil due to which the oil retains a thin film between the two surfaces even at high speed and load is known as film strength .
Properties of Lubricants / Lubricants Properties
-: Lubricants :-
Lubricants is defined as - A substance which is used to reduce friction and heat generated between surfaces when surfaces moves by mutual contact is known as lubricants .
For any machine it is necessary to use a good lubricant.
-: Properties of Lubricants :-
A good lubricants should be contain following properties -
1- Viscosity
2- Flash point
3- Fire point
4- Cloud Point
5- Pour point
6- Oiliness
7- Corrosion
8- Emulsification
9- Physical stability
10- Chemical Stability
11- Neutralization number
12- Specific gravity
13- Adhesiveness
14- Film strength
1- Viscosity :- The ability of the oil to resists internal deformation due to mechanical stress is known as viscosity of oil . In other words , Viscosity is a measure of the ability of the oil film to carry a load .
Viscosity varies with the temperature and hence if a surface to be lubricated is normally at high temperature it should be supplied with oil of a higher viscosity .
Properties of Lubricants / Lubricants Properties
2- Flash Point :- The lowest temperature at which the lubricating oil will flash , when a small flame is passed across its surface , is known as the flash point of the lubricating oil .
The flash point of the should be sufficiently high so as to avoid flashing of oil vapours at the temperatures occurring in common use . High flash point oils are needed in air compressors .
3- Fire Point :- The lowest temperature at which the oil burns continuously , is known as fire point . The fire point also must be high in a lubricating oil , so that oil does not burns in service .
Properties of Lubricants / Lubricants Properties
4- Cloud point :- The temperature at which lubricating oil starts solidifying which makes it to appear cloudy , is known as cloud point .
5- Pour Point :- The lowest temperature at which the lubricating oil will pour is known as pour point of lubricating oil .
This property must be considered because of its effect on starting an engine in cold weather and on free circulation of oil through exterior feed pipes when pressure is not applied .
6- Oiliness :- The property which enables oil to spread over and adhere to the surface of the bearing is known as oiliness of lubricating oil .
7- Corrosion :- A lubricant should not corrode the working parts and it must retain its properties even in the presence of foreign matter and additives .
8- Emulsification :- When a lubricating oil mixed with water and losses its lubricating properties , then this is known as emulsification .
The emulsification number is an index of the tendency of an oil to emulsify with water .
Properties of Lubricants / Lubricants Properties
9- Physical Stability :- A lubricating oil must be stable physically at the lowest and highest temperatures between which the oil is to be used . At the lowest temperatures there should not be any separation of solids , and at the highest temperatures it should not vapourise beyond a certain limit .
10-Chemical Stability :- A lubricating oil should also be stable chemically . There should not be any tendency for oxide formation .
11- Neutralization Number :- An oil may contain certain impurities that are not removed during refining . The neutralization number test is a simple procedure to determine acidity or alkalinity of an oil .
Properties of Lubricants / Lubricants Properties
12- Specific Gravity :- Specific gravity is a measure of density of lubricating oil . It is an indication regarding the grade of lubricant by comparing one lubricant with other . It is determined by a hydrometer which floats in the oil, and the gravity is read on the scale of the hydrometer at the surface of the oil .
13- Adhesiveness :- The property of lubricating oil due to which the oil particles stick with the metal surfaces is known as adhesiveness .
14- Film Strength :- The property of a lubricating oil due to which the oil retains a thin film between the two surfaces even at high speed and load is known as film strength .
Properties of Lubricants / Lubricants Properties
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