ASTM D6203 Standard Test Method for Thermal Stability of Way Lubricants
8. Test Procedure
8.1 Place a representative 75 mL sample of test oil obtained in accordance with Practice D4057 sampling procedure in a clean 100 mL Griffin beaker containing one each of the cleaned and polished iron and copper rods.
8.2 Place the rods crossed in the beaker so that they are in contact at one point. The oil should completely cover the rods.
8.3 Place the beaker and its contents on a tray in the oven. Keep the beakers as far from the walls as possible.
8.4 Maintain the temperature at the center of the oven at 98 to 102°C for 24.0 to 24.5 h.
8.5 Keep the oven doors closed during the entire test period.
8.6 At the completion of 24 h, remove the beakers from the oven and allow to cool to room temperature before proceeding. Continue within 2 h. Individually remove the rods from the oil sample. Inspect for deposits clinging to the rods. Wipe with a piece of facial tissue and inspect for color and etching.
8.7 Copper Rod Inspection - Visually evaluate the color of the rod against the Cincinnati Milacron color chart and record. Record any etching that is evident to the naked eye.
8.8 Steel Rod Analysis - Visually evaluate the color of the rod against the Cincinnati Milacron color chart and record. Record any etching that is evident to the naked eye.
8.9 Beaker Inspection - Invert the beaker and allow the sample to drain for at least 30 min. Rinse with two 50-mL portions of heptane. Inspect the beaker and record any deposits that are visible to the naked eye.
