ASTM c 150
ASTM D4683 – 10 Standard Test Method for Measuring Viscosity of New and Used Engine Oils at High Shear Rate and High Temperature by Tapered Bearing Simulator Viscometer at 150 °C
Significance and Use ASTM c 150 pdf
Viscosity values at the shear rate and temperature of this test method have been indicated to be related to the viscosity providing hydrodynamic lubrication in automotive and heavy duty engines in severe service.
The viscosities of engine oils under such high temperatures and shear rates are also related to their effects on fuel efficiency and the importance of high shear rate, high temperature viscosity has been addressed in a number of publications and presentations.
1.1 This test method covers the laboratory determination of the viscosity of engine oils at 150 °C and 1.0·106 s−1 using a viscometer having a slightly tapered rotor and stator called the Tapered Bearing Simulator (TBS) Viscometer.
2. Referenced Documents (purchase separately)
D4741 Test Method for Measuring Viscosity at High Temperature and High Shear Rate by Tapered-Plug Viscometer
D5481 Test Method for Measuring Apparent Viscosity at High-Temperature and High-Shear Rate by Multicell Capillary Viscometer
dynamic viscosity; engine oils; high shear rate viscosity; high shear viscosity; high temperature viscosity; high shear rate viscosity at 150 °C; rotational viscometer; Tapered Bearing Simulator Viscometer; TBS; used engine oils; Automotive engine fuels/oils; Calibration–petroleum analysis instrumentation; Fuel oils; Loading tests–petroleum products; Lubricating oils; Newtonian fluids; Non-Newtonian fluids; Rotor position value; Shear testing–petroleum products; Tapered bearing simulator; Temperature tests–petroleum products; Torque–petroleum materials/applications; Viscometers–tapered bearing simulator-viscometer (TBS);