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Standard Test Method for Apparent Viscosity of Engine Oils and Base Stocks Between –5°C and –35°C Using Cold-Cranking Simulator
Automatische name übersetzung:
Standard Test Method for scheinbare Viskosität von Motorenöle und Grundöle zwischen & ndash; 5 ° C und & ndash; 35 ° C Mit Kaltstartsimulator
NORM herausgegeben am 1.5.2014
Bezeichnung normen: ASTM D5293-14
Anmerkung: UNGÜLTIG
Ausgabedatum normen: 1.5.2014
SKU: NS-30625
Zahl der Seiten: 10
Gewicht ca.: 30 g (0.07 Pfund)
Land: Amerikanische technische Norm
Kategorie: Technische Normen ASTM
Keywords:
apparent viscosity, cold cranking, cranking, engine oils, petroleum and petroleum products, viscosity, ICS Number Code 75.100 (Lubricants, industrial oils and related products)
Significance and Use | ||||||||
5.1 The CCS apparent viscosity of automotive engine oils correlates with low temperature engine cranking. CCS apparent viscosity is not suitable for predicting low temperature flow to the engine oil pump and oil distribution system. Engine cranking data were measured by the Coordinating Research Council (CRC) L-495 test with reference oils that had viscosities between 600 mPa·s and 8400 mPa·s (cP) at –17.8 °C and between 2000 mPa·s and 20 000 mPa·s (cP) at –28.9 °C. The detailed relationship between this engine cranking data and CCS apparent viscosities is in Appendixes X1 and X2 of the 1967 T edition of Test Method D26026 and CRC Report 409.5.2 The correlation between CCS and apparent viscosity and engine cranking was confirmed at temperatures between –1 °C and –40 °C by work on 17 commercial engine oils (SAE grades 5W, 10W, 15W, and 20W). Both synthetic and mineral oil based products were evaluated. See ASTM STP 621.5.3 A correlation was established in a low temperature engine performance study between light duty engine startability and CCS measured apparent viscosity. This study used ten 1990s engines at temperatures ranging from –5 °C down to –40 °C with six commercial engine oils (SAE 0W, 5W, 10W, 15W, 20W, and 25W).5.4 The measurement of the cranking viscosity of base stocks is typically done to determine their suitability for use in engine oil formulations. A significant number of the calibration oils for this method are base stocks that could be used in engine oil formulations. |
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1. Scope | ||||||||
1.1 This test method covers the laboratory determination of apparent viscosity of engine oils and base stocks by cold cranking simulator (CCS) at temperatures between –5 °C and –35 °C at shear stresses of approximately 50 000 Pa to 100 000 Pa and shear rates of approximately 105 to 104 s–1 for viscosities of approximately 900 mPa·s to 25 000 mPa·s. The range of an instrument is dependent on the instrument model and software version installed. Apparent Cranking Viscosity results by this method are related to engine-cranking characteristics of engine oils. 1.2 A special procedure is provided for measurement of highly viscoelastic oils in manual instruments. See 1.3 Procedures are provided for both manual and automated determination of the apparent viscosity of engine oils using the cold-cranking simulator. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 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.
Standard Practice for Manual Sampling of
Petroleum and Petroleum Products ISO 17025 General Requirements for the Competence
of Testing and Calibration Laboratories Available from American
National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New
York, NY 10036, http://www.ansi.org. Test Method for Apparent Viscosity of
Engine Oils at Low Temperature Using the Cold-Cranking Simulator
(Withdrawn 1993) Standard Practice for Basic Calibration
of Master Viscometers and Viscosity Oil Standards |
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