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ASTM D217-97 Standard Test Methods for Cone Penetration of Lubricating Grease
standard by ASTM International, 11/10/1997
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1.1 These test methods cover four procedures for measuring the consistency of lubricating greases by the penetration of a cone of specified dimensions, mass, and finish. The penetration is measured in tenths of a millimetre.
Note 1-The National Lubricating Grease Institute (NLGI) classified greases according to their consistency as measured by the worked penetration. The classification system is as follows: NLGI Consistency Number Worked Penetration Range, 25 the values shown in parentheses are provided for information.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.