AAR M-914 paragraph 2.3.1 – Apparent Viscosity at -40°F (American Association of Railroads Specification M-914 Brake Cylinder Lubricant Apparent Viscosity)
To safely slow down or stop a moving vehicle, brake cylinder components should move freely, rapidly and smoothly, regardless of the ambient temperature. In cold climates, this may require a brake cylinder grease that will flow properly at -40°F. This test determines the apparent viscosity of lubricating grease at -40°F.
For the procedure, please refer to ASTM D1092. Reported is the apparent viscosity at -40°F in poise at 20 sec-1 and 100 sec-1.
Sample size: 500 g
- ASTM D1092 – Apparent Viscosity of Greases – 1 nozzle from 40°C to -73°C
- ASTM D1092 – Apparent Viscosity of Greases – 8 nozzles with graph from 40°C to -73°C
- ASTM D4684 – Yield Stress/Apparent Viscosity (MRV) per Temp – need temp.
- ASTM D5293 – Apparent Viscosity by Cold Cranking Simulator – need temp.
- DIN 51805 – Kesternich Technique, Flow Pressure – need temperature
- K95400 – Lincoln Ventmeter, Below 0°C – need temperature