ASTM D5483 Test Method for Oxidation Induction Time of Lubricating Greases
ASTM D5483 Standard Test Method for Oxidation Induction Time of Lubricating Greases by Pressure Differential Scanning Calorimetry
6. Apparatus
6.1 Pressure Differential Scanning Calorimeter (PDSC), equipped with the following items (See Fig. 1).
6.1.1 Sample Enclosure, with capability to 3.5 MPa (500 psig) at 210°C and pressure gage graduated at intervals of 200 kPa (28.6 psi) or less.
6.2 Thermal Analyzer.
6.3 Aluminum Sample Solid Fat Index (SFI), pan (see Note 1).
6.4 Oxidation Stability Software. (Warning - In addition to other precautions, use stainless steel or copper tubing which is compatible with oxygen, and pressure gages which are designated for use with oxygen.)
6.5 Calibration Software.
6.6 Flowmeter, with a capacity of at least 200 mL/min.
6.7 Sample Encapsulation Press.
NOTE 1 - It has been found that grease samples can be prepared with more consistent surface areas using SFI pans as compared to flat bottom pans, resulting in better reproducibility.
NOTE 2 - See Fig. 1 for a diagram of a typical test unit.
7. Reagents and Materials
7.1 Oxygen, extra dry, of not less than 99.5 % by volume.
NOTE 3 - Warning: Oxidizer. Gas under pressure.
7.2 Indium, of not less than 99.9 % by mass.
