Penetration, NLGI Classification by quarter cone

Penetration, NLGI Classification by quarter cone


OELCHECK Test equipment:	Petrotest PRN 10, ASTM Cone Penetration Test D 217
Grease quantitiy needed:	appr. 5 grams
Unit:	0.1 mm
Test result:	Penetration of the cone into the grease Consistency Class acc. NLGI Table
Operating time:	~ 0.5 h
Analysis of:	All types of greases and assembly pastes
Brief description:	Appr. 5 grams of grease is filled into a standard container leaving a flat surface. Under prescribed conditions, a standardized cone is allowed to drop into the grease for 5 seconds. The depth of the penetration of the cone into the grease will be measured and reported in 0.1 mm. The level of penetration is measured to determine its NLGI consistency number, ranging from 000 to 6. A soft grease shows a high penetration and a low NLGI number, a hard grease shows a lower penetration in 0.1 mm but a higher NLGI number. Example: Penetration of 265 – 295 is equivalent to NLGI 2.
Statement:	Grease consistency correlates to the firmness of the grease. Depending on the applications they're designed for, greases can range from semi fluid consistencies to almost solid. Care must be taken to select the correct consistency for the application. If the grease is too hard, it may not adequately flow to the areas in need of lubrication. If it is too soft, it may leak away from the desired area. Since consistency mostly correlates to pumpability, equipment greased through a dispensing system may require a grease representing a compromise between what is required for lubrication and what can be adequately pumped.

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