What is grease? How many numbers of grease are there? How many types of grease are there?

grease is

are semi-solid and semi-liquid lubricants. used in equipment Machines in industries that need to be subjected to pressure, shock, and friction that occurs all the time, such as gear teeth , bearings, shafts, O-rings, etc., which are parts of the machine that cannot use lubricant. Because there may be a problem with leakage. Dust or dirt added to contaminate. Therefore, it is necessary to use other lubricants with stability conditions. It has the ability to stick to the desired part better than the lubricant, that is, grease . Buy grease with us.

How many compounds are there in grease?

Grease is caused by lubricant mixed with substances that thicken (Thickener) to keep the oil in a stable condition, not flowing, including substances such as soap, which have many types Each type will give different properties to the grease. Sometimes other substances such as colloidal clay, silica gel or carbon black are used, but the main grease properties. depending on the type of soap can be separated as follows

properties of each type of metal soap

soap type

grease properties

operating temperature

Lime Soap or Calcium (Ca) Soap

Very water resistant but not heat resistant.

no more than 80°C

Sodium (Na) Soap

Heat resistant but not water resistant

Not more than 120°C

aluminum soap

Water resistant but not heat resistant.

Not more than 120°C

Calcium Complex Soap

Water resistant, heat resistant, and able to handle pressure well.

Not more than 180°C

Lithium (Li) soap

Water resistant and heat resistant

no more than 125°C

Lithium Complex Soap

Water resistant, heat resistant, and able to handle pressure well.

Not more than 180°C

Colloidal Clay (Bentonite clay)

Resistant to water and high heat.

230 – 260°C

How many numbers does grease have?

the softness or hardness of the grease This is measured by allowing a pointed conical apparatus to be immersed in the grease at 25°C for 5 s and measured to a depth of 1/10 of a millimeter. The depth of the cone is that the grease is very weak. The National Lubricating Grease Institute (NLGI) has designated grease numbers as follows:


grease number

Sinking distance of test cone 1/10 mm at 25 C

Characteristics Stickiness at 25 C


445 – 475



400 – 430

semi-fluid (Semi-Fluid)


355 – 385

Very Soft


310 – 340



265 – 295

Ordinary Grease (Normal Grease)


220 – 250



175 – 205

Very firm (Very Firm)


130 – 160

Hard (Hard)


85 – 115

Very Hard

The table above shows that when the grease number is higher Grease will harden. The penetration indicates how deep the cone is immersed in the grease. A larger penetration indicates that the grease is softer than less penetration. The hardness of grease depends on the percentage of soap and the viscosity of the base oil.

selection of grease

Choosing a good application must look from two things:

Choose according to viscosity

  • Grease No. 0 or 1 is used for centralized grease distribution systems or centralized systems where grease is used to distribute grease to various lubrication points. With liquid content, grease can be dispensed easily.
  • No. 2 grease is a general grade grease that is most commonly used to lubricate various machine bearings. because it looks not too liquid and the texture is not too tight
  • No. 3 grease is denser than No. 2 grease and is often used in high-speed, low-temperature applications.
  • Grease No. 2-3 or stronger, used for manual or compressed air applications.
  • Any number of grease If the method is smeared or painted by hand Because the viscosity will not affect the work much.

Choose according to usage

  • Is it exposed to water and humidity? If exposed or involved, water resistant grease must be selected. If you use the wrong type Grease will absorb moisture or wash off. Make the greasy drop out of the lubrication point.
  • How high is the operating temperature? For use at temperatures above 80 oC, heat resistant grease should be used. if incorrectly selected The grease will seep out of the lubrication point.
  • In case of exposure to both water and heat Should choose good quality multipurpose grease or complex grease which is less expensive than water resistant grease. or only heat
  • There is a strong impact force during use. If there is a lot, should consider choosing a grease mixed with impact resistant additives (EP Additives).