ASTM D2983 for low-temperature viscosity of lubricants by Brookfield viscometer
ASTM D2983 standard test method for low-temperature viscosity of lubricants measured by Brookfield Viscometer
1. Scope
1.1 This test method covers the use of the Brookfield viscometer and a low-temperature bath for the determination of the low-shear-rate viscosity of lubricants. The test may operate in the viscosity range of 500 to 1 000 000 mPa•s (cP). The bath-controlled temperature is selected within the range of +5°C to -40°C.
1.2 The test method uses the SI unit, milliPascal-second (mPa•s), as the unit of viscosity. (1 cP = 1 mPa•s).
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
D341 Standard Viscosity-Temperature Charts for Liquid Petroleum Products
2.2 European Procedure:
CEC L18-A-80
2.3 ASTM Adjuncts:
ADJD6300 D2PP, Version 4.43, Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 apparent viscosity - the dynamic viscosity determined by this test method. Apparent viscosity may vary with the spindle speed (shear rate) of the Brookfield viscometer if the lubricant is non-Newtonian at low temperatures. See Appendix X1 for a brief explanation.
3.1.2 reference viscosity - the viscosity of a Newtonian standard reference fluid specified at each of several user-specified temperatures. Reference viscosities of typical standard reference fluids are listed in Appendix X2.
