ASTM D2595 Test Method for Evaporation Loss of Lubricating Greases
ASTM D2595 Standard Test Method for Evaporation Loss of Lubricating Greases Over Wide-Temperature Range
9. Procedure
9.1 Weigh the clean grease sample cup and hood to the nearest 0.01 g. Remove the hood and fill the cup with the test grease taking care to avoid occlusion of air. Smooth the surface level with the rim of the cup with a straight edge spatula. Remove with a clean cloth any grease which may remain on the rim or threads of the cup. Thread the hood tightly onto the cup without disturbing the smoothed grease surface. Weigh the assembly and record the net mass of the grease sample to the nearest 0.01 g.
9.2 Remove the cover, eduction tube, and thermocouple assembly from the heating device. Thread the weighed and assembled sample cup and hood into the eduction tube. Install the complete assembly in the heating device. Fasten the cover securely in position. If necessary, readjust the temperature and air flow to the levels required.
9.3 Maintain the air flow rate at 2.58 ± 0.02 g/min (2 L/min) and the exit air temperature at the required test temperature within ±1.1°C (±2°F) for 22 ± 0.1 h. The exit air temperature shall be the specified test temperature.
9.4 At the end of the 22-h period, remove the assembled sample cup and hood from the cell and allow to cool to room temperature. Determine the net mass of the sample to the nearest 1 mg.
10. Calculation
10.1 Calculate the evaporation loss of the sample as follows:
Mass % evaporation loss = [(S - W)/S] x 100
where:
S = initial mass of sample, g, and
W = mass of sample after test, g.
