ASTM-D6821:2007 Edition(Redline)

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D6821-02(2007) Standard Test Method for Low Temperature Viscosity of Drive Line Lubricants in a Constant Shear Stress Viscometer (Redline)

Published By	Publication Date	Number of Pages
ASTM	2007	6

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Category: ASTM

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Description

Significance and Use

Viscosity of drive line lubricants at low temperature is critical for both gear lubrication and the circulation of the fluid in automatic transmissions. For gear oils (GOs), the issue is whether the fluid characteristics are such that the oil will flow into the channel dug out by the submerged gears as they begin rotating and re-lubricating them as they continue to rotate. For automatic transmission fluids, torque, and tractor fluids the issue is whether the fluid will flow into a pump and through the distribution system rapidly enough for the device to function.

The low temperature performance of drive line lubricant flow characteristics was originally evaluated by the channel test. In this test, a pan was filled to a specified depth of approximately 2.5 cm and then cooled to test temperature. The test was performed by scraping a channel through the full depth of the fluid and across the length of the pan after it had soaked at test temperature for a specified time. The time it took the fluid to cover the channel was measured and reported. The channel test was replaced by Test Method D 2983 in 1971.

The results of this test procedure correlate with the viscometric measurements obtained in Test Method D 2983. The correlation obtained is:

The equation was obtained by forcing the fit through zero. The coefficient of variation ( R ² ) for this correlation is 0.9948.

1. Scope

1.1 This test method covers the measurement of the viscosity of drive line lubricants (gear oils, automatic transmission fluids, and so forth) with a constant shear stress viscometer at temperatures from – 40 to 10 ° C after a prescribed preheat and controlled cooling to the final test temperature.

1.2 The applicability of this particular test method to petroleum products other than drive line lubricants has not been determined.

1.3 This test method uses the millipascal second (mPa · s) as the unit of viscosity. One millipascal second is equal to one centipoise.

1.4 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

D2983 Test Method for Low-Temperature Viscosity of Lubricants Measured by Brookfield Viscometer D3829 Test Method for Predicting the Borderline Pumping Temperature of Engine Oil D4684 Test Method for Determination of Yield Stress and Apparent Viscosity of Engine Oils at Low Temperature

Keywords

apparent viscosity; low-temperature flow properties; low-temperature viscosity; mini-rotary viscometer; viscosity; yield stress; Apparent viscosity; Automatic transmission fluids; Calibration–petroleum analysis instrumentation; Drive line lubricants; Gear oils (GO); Low-temperature testing–petroleum products/applications; Low-temperature viscosity; Mini-rotary viscometer; Shear stress; Viscosity–petroleum products; Yield stress;

ICS Code

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

DOI: 10.1520/D6821-02R07 ASTM International is a member of CrossRef.