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This document establishes a classification and specifies the minimum requirements for mineral or synthetic base stock-based greases for the categories CKG and CKL according to ISO 6743-6 intended for the lubrication of enclosed and open gear systems. This document does not cover the extreme cases of use in terms of temperature and extreme charges conditions. For use in exceptional conditions, suppliers and purchasers of lubricants are intended to mutually agree on the testing methods and the acceptability criteria of the products, not covered by this document. NOTE 1   This document can be read in conjunction with ISO 6743-6, ISO 6743-9[1], ISO 12924[3] and ISO 6743-99[2]. NOTE 2   For the purpose of this document, the terms “% (m/m)” and “% (V/V)” are used to represent respectively the mass fraction and the volume fraction of a material.