ASTM D2070 Standard Test Method for Thermal Stability of Hydraulic Oils
5. Apparatus
5.1 An aluminum block with equally spaced holes is used. An example is described in Fig. A1.1 of Annex A1.
5.2 Electric gravity convection oven capable of maintaining the aluminum block at a test temperature of 135°C +/- 1°C.
5.2.1 Calibrated thermocouple and temperature indicator centered in aluminum block.
5.3 250 mL Griffin beakers of borosilicate glass.
5.4 Copper test specimens are to be UNS C11000, 99.9 % pure electrolytic tough pitch copper, 6.35 mm in diameter by 7.6 cm in length (0.25 in. by 3.0 in.).
5.5 Steel test specimens are to be AISI W-1 1 % carbon steel, 6.35 mm in diameter 7.6 cm in length (0.25 by 3.0 in.).
5.6 Silicon carbide abrasive 320 grit with cloth backing.
5.7 Crocus cloth.
5.8 No. 41 Whatman filter paper, 47 mm diameter.
5.9 Millipore filter, 8 micron Type SC, 47 mm diameter.
5.10 Millipore glass filter holder, 47 mm, Cat #XX10.04700 or equivalent.
5.11 Cincinnati Milacron color chart.
5.12 25 mL pipette.
6. Reagents
6.1 Reagent Grade Heptane - Warning, Flammable. Health hazard.
6.2 Reagent Grade Acetone - Warning, Flammable. Health hazard.
7. Preparation of Apparatus
7.1 Handle the rods at all times using forceps or clean cotton gloves.
7.2 Catalyst preparation - Clean the iron and copper catalyst rods, whether new or previously used, prior to use. Clean the rods with the 320 silicon carbide abrasive cloth while rotating the rods in a drill chuck at 1700 to 1800 r/min. Clean the surface until it has a bright copper or steel appearance. Discard rods when diameter is less than 6.2 mm.
7.3 Prepare surface finally with a crocus cloth. Remove all grind marks. Finish the rods to a lightly polished surface finish.
7.4 Wash the rods individually with acetone and air dry on completion of the polishing operation.
