ASTM International

Standard Test Method for Low-Temperature Viscosity of Lubricants Measured by Brookfield ViscometerLowViscometer-Temperature Viscosity of Lubricants Measured by Brookfield
 N D2983

Annotation

This test method covers the use of Brookfield viscometers of appropriate torque for the determination of the lowshear- rate viscosity of lubricants. The test may be applied over the viscosity range of 500 mPa·s to 900 000 mPa·s within a low temperature range appropriate to the capacity of the viscometer head.3

This test method contains three procedures: ProcedureA is used when only an air bath is used to cool samples in preparation for viscosity measurement. Procedure B is used when a mechanically refrigerated programmable liquid bath is used to cool samples in preparation for viscosity measurement. Procedure C is used when a mechanically refrigerated constant temperature liquid bath is used to cool samples in preparation for viscosity measurement.

The range of viscosity used to generate the precision data for this test method was from 300 mPa·s to 170 000 mPa·s at test temperatures from –12 °C to –40 °C. The ILS also included viscosities beyond 500 000 mPa·s and temperatures down to –55 °C and are included in Appendix X5. Appendix X4 lists another interlaboratory study that specifically targeted hydraulic fluid ranging from 500 mPa·s to 1700 mPa·s.

The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

The test method uses the SI unit, milliPascal-second (mPa·s), as the unit of viscosity. (1 cP = 1 mPa·s).

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