ASTM D4693 - Low-Temperature Torque of Grease-Lubricated Wheel Bearings
Significance and Use
5.1 This test method differentiates among greases having distinctly different low-temperature characteristics. This test is used for specification purposes and correlates with its precursor which has been used to predict the performance of greases in automotive wheel bearings in low-temperature service. It is the responsibility of the user to determine the correlation with other types of service.
1.1 This test method covers the determination of the extent to which a test grease retards the rotation of a specially manufactured, spring-loaded, automotive-type wheel bearing assembly when subjected to low temperatures. Torque values, calculated from restraining-force determinations, are a measure of the viscous resistance of the grease. This test method was developed with greases giving torques of less than 35 N·m at −40°C.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.Extracted, with permission, from ASTM D4693-07 - Low-Temperature Torque of Grease-Lubricated Wheel Bearings, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428. A copy of the complete standard may be purchased from ASTM International, astm.org