Potrebujeme váš súhlas na využitie jednotlivých dát, aby sa vám okrem iného mohli ukazovať informácie týkajúce sa vašich záujmov. Súhlas udelíte kliknutím na tlačidlo „OK“.
Standard Test Method for Measuring Apparent Viscosity at High-Temperature and High-Shear Rate by Multicell Capillary Viscometer
Automaticky preložený názov:
Štandardná skúšobná metóda na meranie zdanlivej viskozity na vysoké teploty a vysoké šmykové rýchlosti by Multicell kapilárou
NORMA vydaná dňa 1.10.2013
Označenie normy: ASTM D5481-13
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.10.2013
Kód tovaru: NS-31389
Počet strán: 6
Približná hmotnosť: 18 g (0.04 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Keywords:
capillary method, shear testing&mdash,petroleum products, viscosity, viscosity&mdash,apparent, ICS Number Code 75.100 (Lubricants, industrial oils and related products)
Significance and Use | ||||||||
5.1 Viscosity is an important property of fluid lubricants. The viscosity of all fluids varies with temperature. Many common petroleum lubricants are non-Newtonian: their viscosity also varies with shear rate. The usefulness of the viscosity of lubricants is greatest when the viscosity is measured at or near the conditions of shear rate and temperature that the lubricants will experience in service. 5.2 The conditions of shear rate and temperature of this test method are thought to be representative of those in the bearing of automotive engines in severe service. 5.3 Many equipment manufacturers and lubricant specifications require a minimum high-temperature high-shear viscosity at 150 °C and 106 s−1. The shear rate in capillary viscometers varies across the radius of the capillary. The apparent shear rate at the wall for this test method is increased to compensate for the variable shear rate.3 5.4 This test was evaluated in an ASTM cooperative program.6 |
||||||||
1. Scope | ||||||||
1.1 This test method covers the laboratory determination of high-temperature high-shear (HTHS) viscosity of engine oils at a temperature of 150 °C using a multicell capillary viscometer containing pressure, temperature, and timing instrumentation. The shear rate for this test method corresponds to an apparent shear rate at the wall of 1.4 million reciprocal seconds (1.4 × 10 6 s−1).1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.2.1 The centiPoise (cP) is a non-SI metric unit of viscosity that is numerically equal to the milliPascal-second (mPa·s). 1.2.2 Pounds per square inch (psi) is a non-SI unit of pressure that is approximately equal to 6.895 kPa. These units are provided for information only in 6.1.1, 7.3, 9.1.2.1, and the tables. 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 | ||||||||
|
Historická
1.6.2012
Historická
1.5.2014
Historická
1.6.2012
Historická
1.5.2013
Historická
1.10.2013
Historická
1.5.2007
Chcete mať istotu o platnosti využívaných predpisov?
Ponúkame Vám riešenie, aby ste mohli používať stále platné (aktuálne) legislatívne predpisy
Chcete vedieť viac informácií ? Pozrite sa na túto stránku.
Posledná aktualizácia: 2024-12-22 (Počet položiek: 2 217 000)
© Copyright 2024 NORMSERVIS s.r.o.