1. Scope

1.1 This test method covers how to measure the apparent viscosity of used and soot-containing engine oils at low temperatures.

1.2 A shear rate of approximately 0.2 s ^-1 is produced at shear stresses below 200 Pa. Apparent viscosity is measured continuously as the sample is cooled at a rate of 3C per hour over the range of 5 to 40C.

1.3 The measurements resulting from this test method are viscosity, the maximum rate of viscosity increase (Gelation Index) and the temperature at which the Gelation Index occurs.

1.4 Applicability to petroleum products other than engine oils has not been determined in preparing this test method.

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

1.6 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 (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D341 Practice for Viscosity-Temperature Charts for Liquid Petroleum Products

D3829 Test Method for Predicting the Borderline Pumping Temperature of Engine Oil

D4057 Practice for Manual Sampling of Petroleum and Petroleum Products

D4684 Test Method for Determination of Yield Stress and Apparent Viscosity of Engine Oils at Low Temperature

Keywords

borderline pumping temperature; critical pumpability temperature; critical pumpability viscosity; engine oil; gelation; Gelation Index; Gelation Index Temperature; low-temperature engine oil pumpability; low-temperature rheology; Scanning Brookfield technique; sooted oils; temperature-scanning technique; used oils; viscosity; ICP-AES (inductively-coupled plasma atomic emission spectrometry); Middle distillate fuels; Scanning Brookfield technique; Viscosity; Borderline pumping temperature (BPT); Critical pumpability viscosity; Engine (lubricating) oils; Gelation;

ICS Code

ICS Number Code 75.100 (Lubricants, industrial oils and related products)

DOI: 10.1520/D7110-05A

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