ISO 12925-3-2021 pdf download.Lubricants, industrial oils and related products (Class L)一Family C (gears) – Part 3: Specifications for greases for enclosed and open gear systems.
4 Sampling
Unless otherwise specified, sampling of gear greases shall be carried out in accordance with the relevant procedure described in Iso 23572. The sample shall be evaluated on a representative portion. Any drum, barrel, tanker compartment or any type of container delivered to the end user may be sampled and analysed at the discretion of the purchaser.
5 Greases for gear systems
5.1 Penetrability of gear greases
Gear greases are greases of NLGI consistencies, as per ISO 6743-99, in the range of 000 to 1, i.e. greases that are very soft up to soft at ambient temperature.
5.2 Classes of gear greases
5.2.1 Greases for enclosed gear systems CKG
These are generally NLGI 000, 00, 0 consistency grade greases, made from mineral or synthetic base stocks (most generally in the ISO VG 150 to 460 range), thickeners of various types (most generally conventional lithium or lithium/calcium soaps), antioxidants and corrosion inhibitors. They might also contain additives to improve the load carrying properties. These greases are generally used with splash lubrication.
5.2.2 Greases for open and semi-enclosed gear systems CKL
These are generally NLGI 0, 1. less frequently 2 consistency grade greases made from mineral or synthetic base stocks (most generally in the ISO VG 680 to 3200 range), thickeners of various types (most generally conventional lithium or lithium/calcium soaps), antioxidants and corrosion inhibitors. They might also contain additives to improve the load carrying properties and solid lubricants like graphite, molybdenum disulfide, etc.
6 Classification of greases for gear systems
6.1 Classification of greases for enclosed gear systems
Table 1 gives the classification of greases for enclosed gear systems. The ISO-L symbol is completed by the NLGI grade.
Table 2 gives the classification of greases for enclosed gear systems for applications requiring environmentally acceptable products: biodegradability and/or low eco-toxicity. The lSO-L symbol is completed by the NLGI grade.ISO 12925-3 pdf download.