Penetration of grease
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.
ASTM D - 17 Standard Test Methods for Cone Penetration of Lubricating Grease
Description:Bearing Grease Consistency The consistency of bearing grease can greatly affect bearing performance. As most people know, the consistency of oil lubricants is measured in terms of "viscosity. Grease Penetration Definition Penetration is the depth, in tenths of millimeters, to which a standard weighted cone sinks into the grease under prescribed conditions "unworked" versus "worked". Therefore, higher penetration numbers indicate softer greases, since the cone has sunk deeper into the sample. How is Unworked Penetration Measured? The cone and its movable assembly, weighing Grams 0.