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
6. Apparatus
6.1 Evaporation Cell Assembly (Fig. 1) consisting of the following items:
6.1.1 Sample Cup, A.
6.1.2 Hood, B.
6.1.3 Cover and Eduction Tube, C - These items (5.1.1 to 5.1.3) shall be constructed from a stainless steel conforming to Type 304 of Specification A 240. Design dimensions and dimensional tolerances shall be as shown in Fig. 2 and Fig. 3.
6.1.4 Gasket - Shall be of a heat-resistant (315°C (600°F)) material. A gasket cut from 3.2 mm (1/8-in.) TFE-fluorocarbon sheet has been found to work successfully.
6.1.5 Thermocouple Tube and Supports - The tube shall be of stainless steel having an outside diameter of 3.18 ± 0.025 mm (0.125 ± 0.001 in.) and fitted with stainless steel centering devices as shown in Fig. 1.
6.2 Air Supply System - Shall consist of a calibrated flowmeter, filtering device, and accessory valves capable of delivering and maintaining a flow of dust-free air at the rate of 2.58 ± 0.02 g/min between 15.6 and 29.4°C (60 and 85°F) (2 L/min at standard temperature and pressure).
6.3 Heating Device - An aluminum block heater similar to that shown in Fig. 4 has been found to be satisfactory. It is more fully described in the Appendix.
6.4 Thermometers - ASTM thermometers graduated in either Fahrenheit or Celsius degrees and having a range from -5 to 400°C (20 to 760°F) and conforming to the requirements for Thermometers 3C or 3F respectively as described in Specification E 1.
7. Sampling
7.1 Each test will require approximately 20 g to fill the sample cup for a single run. Therefore, the sample presented for analysis should be large enough to make possible the selection of a representative portion for testing. Examine the sample for any indication of non-homogeneity such as oil separation, phase changes, or gross contamination. If any abnormal conditions are found, obtain a new sample.
