Abrasive wear: mechanical wear caused by two contact surfaces sliding against each other

  Additives: Small amounts of substances added to improve lubricating properties

  Adhesion Improvers: Additives to oils and greases to improve adhesion (eg polyisobutylene)

  Adhesion lubricant: Add adhesion improver to prevent the lubricant from being thrown off due to centrifugal force

  AF coating: anti-friction coating, currently the most widely used dry film solid lubricant, including room temperature curing type and heat curing type. Formulated with solid lubricating material (called "raw meal") and binding material, see "Binders"

  Anti-aging: material aging caused by oxidation, overheating, or containing certain metals (such as copper, lead, silver, etc.), the anti-aging ability of materials can be improved by adding certain additives (such as antioxidants)

  ASTM: American Society for Testing and Materials

  Base oil: the basic component of lubricating oil and grease

  Binder: A non-volatile medium or excipient used to enhance the bonding fastness between solid lubricant particles or the degree of adhesion between the solid lubricant film and the friction surface

  Bonding Lubricant: See AF Coating

  Loosening Torque: The torque required to loosen a bolted connection

  Chemically inert: (lubricants) do not react chemically with certain substances

  Coefficient of friction: The ratio of the frictional force to the normal force between two contacting surfaces

  Low temperature performance: The cloud point, pour point and freezing point of lubricating oil are used as indicated values. For lubricating grease, Kesternich flow pressure and low temperature torque test can be used to measure

  Colloid: Particles (particle size 10-5 to 10-7cm) in a stable liquid as a solution (no particle settling)

  Complex grease: grease with thickeners made of metallic soaps and various acids, especially suitable for high temperature and long-term use

  Consistency: An index of grease, divided into unworked penetration and working penetration, and measured according to NLGI (American Lubricating Grease Institute) standards. Simply divide the consistency into nine grades, for example:

  Consistency grade Working taper degree (1/10mm)

   000 445—475

   00 400—430

   0 350—385

   1 310—340

   2 265—295

   3 220—250

   4 175—205

   5 130—150

   6 85—115

  Density: mass of lubricant per unit volume at 20°C (g/cm3)

  Detergents: Surfactants that remove surface residues and deposits

  Dispersibility: Improve the dispersibility of insoluble substances in liquids

  DN value: the reference value of rotational speed to rolling bearing grease, expressed by bearing pitch diameter (mm) multiplied by revolutions per minute

  Dropping point: refers to the temperature at which the grease changes from a semi-solid state to a liquid state, which is an indicator of the heat resistance of the grease. As the temperature increases, the temperature at which the first droplet drops from the container is determined as the dropping point temperature

  Dynamic viscosity: the absolute viscosity, which reflects the internal resistance between the fluid molecules when the lubricating oil flows. Measured by lubricating oil flowing through pipe holes or gaps

  EP additive: a chemical to improve the ability to withstand heavy loads, high temperatures, thereby enhancing the abrasion resistance of oils and greases

  Emcor: Corrosion resistance test of rolling bearing grease in water, at least two bearings lubricated with grease run in water for about a week to test, the corrosion resistance value is 0 to 5 (0 means no corrosion, 5 means severe corrosion)

  Ester oils: compounds of acids and alcohols, used in the production of lubricating materials and greases

  Flash point: The lowest temperature at which a flash fire occurs when a flame is exposed to a mixture of oil vapor and air

  Fluorosilicone oil: Silicone oil containing fluorine atoms in the molecule

  Freezing point: the temperature at which oil solidifies and loses fluidity

  Fretting corrosion wear: a kind of mechanochemical wear caused by the relative sliding of two contact bodies, pitting pits appear on the friction surface and oxide chips are accumulated between the friction surfaces

  Friction: When two objects move relative to each other, the tangential impedance phenomenon that exists on the contact interface

  Grease: Lubricating medium composed of base oil and thickener

  Inhibitors: additives used in lubricants to retard aging and corrosion