Grease Consistency | Basic Knowledge About Grease | Kyodo Yushi Co., Ltd. - Penetration of grease
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Penetration is the depth, in tenths of millimeters, to which a standard weighted cone sinks into the grease under prescribed conditions ("unworked" versus. The NLGI consistency number (sometimes called “NLGI grade”) expresses a measure of the Once worked, the grease is placed in a penetration test apparatus. This apparatus consists of a container, a specially-configured cone and a dial.