Industrial lubricant mainly includes hydraulic oil, gear oil, steam turbine oil, compressor oil, refrigerating machine oil, transformer oil, vacuum pump oil, bearing oil, metal processing oil (fluid), preservative oil and grease, cylinder oil, heat treatment oil and conduction oil, etc. Besides, there is also lubricating grease produced by adding thickening agent into the base oil of lubricating oil. Users of industrial lubricant are enterprises of different industries and sectors, who generally use a rich variety and a huge quantity of lubricant. It not only depends on the price of products, but also depends on quality and technical properties of products and quality of technical service. Therefore, technology marketing is more important for industrial lubricant.

Enterprises using industrial lubricant have a relatively concentrated layout of machinery and equipment, therefore a purposeful and targeted technical exchange is more necessary, which is also the main form of before-sale technical service.

The main indicator for basic performance and selection of industrial lubricant is viscosity, which should be introduced in priority. GB/T3141-94 is a viscosity classification of industrial fluid lubricant, which is equal to the international standard ISO3448-1992 ISO Viscosity Classification of Industrial Fluid Lubricant. Generally speaking, under working conditions such as a medium rotation speed, a medium load and a not-so-high temperature, lubricant with a medium viscosity is recommended; under working conditions such as a high load, a low rotation speed and a relatively high temperature, lubricant with a high viscosity or lubricant added with anti-wear reagent at extreme pressure is recommended; under working conditions such as a low load, a high rotation speed and a low temperature, lubricant with a low viscosity is recommended; under working conditions such as a wide range of high and low temperature, a light load and a high rotation speed, and working conditions with other special requirements, synthetic lubricant is recommended.

　　The indicator for basic performance and selection of lubricating grease is penetration degree, which is used to rate the thickness of lubricating grease. Therefore, it should also be introduced to the users. Penetration degree is the indicator commonly used by various lubricating grease to control working thickness, which indicates the performance of lubricating grease entering the friction point and its hardness. Generally speaking, when the bearing using lubricating grease is under a large load and a rotation speed, lubricating grease with a small penetration degree should be used. Otherwise, lubricating grease with a large penetration degree should be used. Synthetic lubricating grease should be used for a wide range of high and low temperature, a light load, a high rotation speed and a low temperature and when there are other special requirements.

There are a great variety of industrial lubricants, which are different in technical properties and involve an extensive range of technologies. Hydraulic oil is a major type of industrial lubricant that is used most, which will be illustrated as an example.

In a hydraulic transmission system, as a medium of energy transmission, hydraulic oil can transmit the power, reduce friction, separate worn surfaces, suspend pollutants, protect elements from oxidation and has a cooling effect. Each sort of hydraulic system has a different structure and using conditions. To meet the requirements of various systems, the hydraulic oil must be of certain properties, like, viscosity, viscosity index, relative density, abrasion resistance, low temperature, acidity value, flash point, oxidation stability, demulsibility, hydrolytic stability, formability, air release property, shear stability, anti-rusting property and filterability. According to GB11118.1-94, hydraulic oil can be classified into the following varieties based on their usages, while each variety consists of different viscosity levels.

HL hydraulic oil is made by adding anti-oxidation and anti-rusting additives into neutral base oil with a relatively high refining depth, which is used in common hydraulic equipment of machine tools to reduce the abrasion of parts, reduce temperature rise and prevent rusting.

HM hydraulic oil is made by adding anti-oxidation agent, anti-rusting agent and anti-abrasion agent into a neutral base oil with a relatively high refining depth and a viscosity index larger than 95. Therefore, its abrasion resistance is good, and can be used in high-speed and high-pressure hydraulic systems.

HG hydraulic oil is made by adding stick-skip resistant additives (oiliness agent or anti-friction agent) to HM hydraulic oil. Other than having a good anti-oxidation, anti-rusting and anti-abrasion performance, it has also a good stick-skip resistance, and can be used in machine tools sharing a hydraulic system and a guide rail lubricating system so as to minimize the vibration and discontinuous sliding (stick-skip) of a guide rail under a low speed.

HV hydraulic oil is made by adding anti-oxidation, anti-rusting, anti-abrasion, viscosity improving agents and pour point reducer into a base oil with a viscosity index higher than 130, which can be used in hydraulic equipment that work outdoors in the cold regions and in a poor environment.

HS hydraulic oil is a synthetic hydraulic oil, which is made by adding various additives similar to those added into HV hydraulic oil into the base oil of α-olefin synthetic oil with an excellent low temperature performance, which is made into a low temperature hydraulic oil with a pour point not higher than -45℃ and is applicable to hydraulic equipment that work outdoors in the cold regions and in a poor environment.