Grease is very complex, there are many grades, classification is very important. The original gb501-65, classified as thickener, can no longer meet the development use requirements of lubricating grease, it was annulled on April 1, 1988. Gb7631.8-90 specifies the system for classifying tebbers grease according to the requirements of grease. Use. This classification system adopts ISO classification method equivalently replaces gb501-65. The production, sale use of grease have been fully integrated into the new classification system. Therefore, in order to explain the specific differences between the old new classification systems, it is necessary to compare the old new classification systems.

  1. Old classification GB 501-65

  According to the composition of thickener, gb501-65 can be divided into four types: soap grease, hydrocarbon grease, inorganic grease organic grease.

  Soap group can be divided into single soap group according to different calcium soap, such as calcium group, sodium group, lithium group, aluminum group, barium group, lead group, etc. Mixed soap base, such as calcium sodium base, calcium aluminum base, lead barium base, aluminum barium base; compound soap base, such as compound calcium base, compound aluminum base, etc. All kinds of lubricating grease in the same group can be divided into industrial, marine other groups according to the use purpose.

  The grease in the old classification is named in the following order:

  Grade endnote group name level name category

  Example:  synthetic calcium base grease (code zg-1h)

  Including:  brand (cone Series No.)

  Synthetic endnotes (synthetic fatty acids)

  Calcium group (thickener)

  Grease category (grease)

  The codes for the grease are shown in the following order:

  Class No. - Group No. - grade No. - brand No. - endnote No

  Example: zj-4s (No.4 graphite hydrocarbon grease)

  Including: class Z number (fixed code)

  J-group No. (thickener is hydrocarbon)

  4 brand (cone serial number)

  S -- endnote No. (including graphite packing)

 Grease is classified according to the composition of thickener, which has great limitation. A variety of greases with different properties can be produced by using the same thickener. Even if they are produced by different types of thickeners, their properties are often difficult to distinguish accurately. Therefore, users classified by thickener will be confused, it is difficult to choose without using experience finding corresponding standards. The usage conditions of the grease are seen in the grouping, naming code, the grease standard of the code must be searched again. Therefore, it is difficult for users to choose correctly easy to abuse, which leads to lubrication accidents.

  2. New classification GB 7631.8-90