ISO 12925-3 pdf free download

ISO 12925-3-2021 pdf free download.Lubricants, industrial oils and related products (Class L)一Family C (gears)一 Part 3: Specifications for greases for enclosed and open gear systems.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content  constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 1817, Rubber, vulcanized or thermoplastic一Determination of the effect of liquids
ISO 2137, Petroleum products and lubricants一Determination of cone penetration of lubricating greases and petrolatum
ISO 2176, Petroleum products一Lubricating grease一Determination of dropping point
ISO 2160, Petroleum products一Corrosiveness to copper一Copper strip test
ISO 3104, Petroleum products- Transparent and opaque liquids一Determination of kinematic viscosity and calculation of dynamic viscosity
ISO 3733, Petroleum products and bituminous materials一Determination of water一Distillation method
ISO 4259-2, Petroleum and related products一Precision of measurement methods and results- Part 2:Interpretation and application of precision data in relation to methods of test
ISO 6341, Water quality一Determination of the inhibition of the mobility of Daphnia magna Straus (Cladocera, Crustacea) – – Acute toxicity test
ISO 6299, Petroleum products一Determination of dropping point oflubricating greases (wide temperature range)
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 ISO-L symbol is completed by the NLGI grade.ISO 12925-3 pdf download.