Grease is defined by Wikipedia as a semisolid lubricant that generally consists of a soap emulsified with mineral or vegetable oil. (link the word Wikipedia to this URL  Due to its nature it requires some different types of testing than do liquids fuels or lubricants.  Among these are penetration, water washout properties, shear stability properties, roll stability, oxidation and the dropping point temperature.  The specification for automotive lubricating greases is ASTM D4950. SAE and NLGI are organizations which also have significant input into the automotive grease specification. Stanhope Seta has been involved in producing instruments for these methods for many years and produce instruments for many of the methods called for in this specification. (Note: There are greases for many other applications than automotive.  In general the measurement of their properties is quite similar.)

Methods required in Automotive Grease Specification:

Penetration, D217

Dropping Point, D566 or D2265

Water Washout, D1264


Four Ball Wear Test, D2266

Extreme Pressure Four Ball Wear Test, D2596

Other grease test methods:

Cone Penetration of Petrolatum, D937

Cone Penetration of Lubricating Grease Using One-Quarter and One-Half Scale Cone Equipment, D1403

Roll Stability of Lubricating Grease, D1831

Wear Preventive Characteristics of Lubricating Grease, D2266

Oil Separation from Lubricating Grease During Storage, D1742 (CONTACT LAZAR SCIENTIFIC)

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