Grease in general consists of inedible oil, the rendered fat of waste animal parts, or a petroleum-derived or synthetic oil containing a thickening agent. In commercial use, grease has common lubricating function, especially in bearings, because of its characteristic feature. Grease possesses high initial viscosity (thixotropic), which can handle the application of shear. Grease can also along with various additives to improve their lubricating properties such as rust inhibitors, EP (extreme pressure) additives (like graphite and Molybdenum disulfide), oxidation preventatives, PTFE, copper and etc.

As is clear, the difference between grease and oil is that grease is a suspension of oil (makes up between 75%-90% oil) in a thickener. Not only grease can be applied to some process that the feature of the grease allows to stay in place longer than oil, but also it acts as sealants to prevent the ingress of water and incompressible materials. Actually, because of semi-solid to solid consistency grease exclusivity, where a lubricating oil would not stay in a position, grease has a great function.

The choice between grease lubrication and oil lubrication are listed below:

Grease should be used in a process that can apply:

  • Covering simplified maintenance film
  • Improving fewer leaks
  • Having better function against contaminants

Oil lubrications are used in applications where operating temperature is high or its bearing at high speed.

Grease Types

Greases are mainly divided into three main types as:

  • Aluminum-based greases
  • Calcium-based greases
  • Lithium-based greases

For more information on the grades and specifications, please do not hesitate to contact us

Packing

Packing of Grease 

  • Drums (400 Ib.)

  • Steel Pails (20 Ib.)

  • Steel Cans

Properties

  1. Penetration and Consistency: Consistency, expressed as the distance that a standard needle or cone penetrates vertically into a sample of the grease.
  2. Dropping Point: The temperature at which the first drop of liquid separates when grease is heated under prescribed conditions.
  3. Texture: The texture of grease is observed when a small portion of it is pressed together and then slowly, drawn apart. Texture can describe as: Buttery, Long Fibers, Short Fibers, Stringy, and so on.
  4. Color: The color of grease is related to the components, so it could not be a sign of grease quality.
  5.  FillerAny substance such as talc, mica or various powders which may be added to greases, but isn’t considered as being primarily intended to enhance the lubricating properties of the grease.
  6. Resistance to softening room temperature: The resistance to softening room temperature is the property of grease, which shows its service life in ambient temperature.
  7. Water resistance: The resistance of a lubricating grease to adverse effects to the addition of water to the lubricant system.
  8. PumpabilityIs the flow characteristic of grease that permit satisfactory delivery from lines, nozzles and subsequent lubrication of moving components.
  9. Incompatibility: When a mixture of two greases shows physical properties or service performances which are markedly inferior to those of either of the greases before mixing, they are incompatible. Performance or properties inferior to one of the products and superior to the other may not be due to incompatibility.

Lubricating greases have a number of advantages over lubricating fluids:

Advantages and disadvantages of grease:

      • Acts as sealant to minimize leakage
      • Easy to contain than oil
      • More stable suspension while solids will settle out of oils
      • Do not need controlling system for fluid level
      • Cannot be a heat transfer like a circulating oil.
      • Have more resistance to move at start-up than oil.
      • Have difficulty for dispensing, draining and refilling.

Application of Grease 

      1. Lubricating film at machinery that runs intermittently or not work for an extended period of time.
      2. Motors and gearboxes that needs high quality lubricant for relatively inaccessible components
      3. Operating under extreme conditions (such as high temperature, high pressure, shock loads, slow speed under heavy loads and etc.)
      4. Maintaining film at pulverized components

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