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Grease

Grease

Grease

The grease is a gelatin mixture made of oil, soap and additives. Greases, like oils, have the task of minimizing friction and wear between surfaces..
The first gravel in 1400 BC was made of mixing olive oil and lime to lubricate the wheels of a wooden chariot in ancient Egypt, and then the first grays in modern form in 1872 with sodium at the beginning of the industrial revolution in Europe It is now being marketed and nowadays these greases are almost obsolete and greases are being produced at various bases such as lithium, calcium, aluminum, etc.
The greases are classified according to the type of base oil and the type of thickening agent (soap), and for rigidity, greases are classified with NLGI grades, which are of ....., 1, 2, 3, 4, 5, 6 is available, and the hardest grease has NLGT 4 and is the most soft one, which indicates that there is more oil in the grease.

Further Details:

Grease is a petroleum derivative with a high viscosity.
Behran Product Pars Product Iranol Product Total Product Shell Product
Behran Yaghut Pars Mahan Iranol Lima Total Multis Shell Gadus

The grease is usually solid or semi-solid at normal temperature and ambient temperature and is divided into nine grades (grid) based on the viscosity. In the name of Grace, six groups are created:
  • 1Application of grease
  • 2Used Aditive(if existence)
  • 3Synthetic base oils (if existence)
  • 4Grade Grease
  • 5The highest operating temperature allowed
  • 6Low operating temperature
  • Chemical properties of grease

    The grease is produced from a mixture of a thickener such as metal soap with a lubricant such as oil. Thickeners are a kind of hydrocarbons, which range from 50 to 60 and sometimes more than 80 carbon atoms. This is where hydrocarbon-based lubricants generally do not have more than 30 carbon atoms.

  • Grease production method

    For the production of grease, the required metal soap is made from the combination of amino acids and metal alkali (lithium, sodium or calcium) and added to the lubricant in a special device. Gray models do not have metal soap and are used in bentonite mineral soils to thicken it.

  • Use Cases

    Grease is used for lubricants, which can not be lubricated with a fluid lubricant (oil) or is not economical. (Such as car parts), greases, unlike oil, can not be cooled and cleaned.

Grade Grease Table in NLGI Method

Grade NLGI DIN 51818 Application Structure (physical state) influence after work ISO2137 0.1MM Application method
000
00
0 		Lubrication of gears liquid
Almost liquid
Infinitely soft 		475…445
430…400
385…335 		With the help of the system
Central pumping
1
2 		Lubrication
Bearings 		Very Soft
Soft 		340…310
295…265 		With the help of pumped grease or central pump
3 Lubrication of bearings Middle 250…220 Pumped grease
4 Sealing devices Stiff 205…175 Pumped grease
5
6 		Sealing devices Very Stiff
Infinitely stiff 		160…130
115…85 		Straight to solid

Tips on Grease

  • Important points in the choice of grease
  • The benefits of lubrication with grease
  • Lubrication disadvantages with grease

Important points in the choice of grease:

  • Type, speed and temperature of machine operation and ambient humidity
  • Changes in the degree of heat
  • The ability to prevent rust and corrosion of machine parts
  • The useful life of the grease and the re-grease conditions

Benefits of grease lubrication compared to lubricating oils:

  • Sustainability at the lubrication site
  • Ease of use and reduce lubrication
  • Improve sealing devices, reduce leakage and lubricate leaking
  • Lubricant adhesion optimization, to parts, under high temperature and pressure conditions
  • Simplicity of the design of lubrication systems
Grease lubrication disadvantages compared to lubricating oils:
  • Low cooling capability
  • Failure to penetrate the pieces of the instruments
  • Need more labor (worker) for lubrication
  • Need more labor (worker) for lubrication
  • Failure to clean and remove contaminants from moving parts

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