ASTM-VI

[MolaKule]

This ASTM test measures a temperature of oil for cold weather conditions.

In this test, the lubricant is cooled from 80C to a nonlinear programmed cooling rate over 10 hours and then held for 16 more hours at this level to measure this parameter.

What ASTM test is it and what does it do?

 

[jason07-1zzfe]

ASTM D5133 scanning brookfield gelation index. Creates a viscosity curve over that timeframe. Measures tendency of oil to gel. The higher the number the more likely to cause cavitation. I think it represents more of real world conditions than the rapid cooling of standard low temp visc test as rapid cooling may not thicken oil as much as if cooled slowly.

 

[jason07-1zzfe]

D4684 MRV ??

 

[MolaKule]

Good try Jason - but not quite.

Hint: Think of cold weather pumping temperature.

 

[427Z06]

D5133-01 Standard Test Method for Low Temperature, Low Shear Rate, Viscosity/Temperature Dependence of Lubricating Oils Using a Temperature-Scanning Technique

1.1 This test method was developed to measure the apparent viscosity of engine oil at low temperatures.

1.2 A shear rate of approximately 0.2 s-1 is produced at shear stresses below 100 Pa. Apparent viscosity is measured continuously as the sample is cooled at a rate of 1°C/h over the range -5 to -40°C, or to the temperature at which the viscosity exceeds 40 000 mPas (cP).

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.

 

[MolaKule]

Jason wins this weeks GITMO Gourme Cookbook.

D 4684 is indeed the spec to which we refer.