ASTM D7317 Standard Test Method for Coagulated Pentane Insolubles in Used Lubricating Oils by Paper Filtration (LMOA Method)
6. Apparatus (see Fig. 1)
6.1 Smooth-tip Forceps.
6.2 Graduated Cylinder, 50 mL with stopper.
6.3 Oven, explosion-proof, capable of maintaining a temperature of 50 +/- 3°C.
6.4 Oven, explosion-proof, capable of maintaining a temperature of 100 +/- 3°C.
6.5 Filtering Flask, 1 L.
6.6 Filter Holders, borosilicate glass.
6.7 Filter Membrane, 0.45 µm.
6.8 Weighing Dish, aluminum.
6.9 Balance, capable of weighing to the nearest 0.0001 g (0.1 mg) with a range of 160 g.
6.10 Vacuum, capable of maintaining 50.653 kPa (15 in. Hg) minimum.
6.11 Stopwatch or Other Timing Device, capable of measuring to the nearest 0.1 s with a range of at least 5 min.
7. Reagents and Solvents
7.1 Purity of Reagents - Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that all reagents shall conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society, where such specifications are available. Other grades may be used, provided it is first ascertained that the reagent is of sufficiently high purity to permit its use without lessening the accuracy of the determination. If industrial grade pentane is used, it shall be filtered using 0.45 µm filter paper.
7.2 n-butyl diethanolamine (2,2'- (butylimino) diethanol), 98 %. (Warning - May be harmful if inhaled or swallowed.)
7.3 Pentane (n-pentane), 98 %. (Warning - Extremely flammable. Vapors may cause flash fires.)
7.4 Pentane-Coagulant Solution, 1 % - Add 5 mL of n-butyl diethanolamine (Warning - Flammable.) to 500 mL of n-pentane (Warning - May be harmful if inhaled or swallowed.) and mix. Solution shall be used within one month and should preferably be made within a week of using.
8. Sampling
8.1 Obtain a sample using either Practice D4057 or D4177.
8.2 Heat the sample of used oil to 50 +/- 5°C for 1/2 h +/- 5 min in the original container and agitate until all sediment is homogeneously suspended in the oil. Ifthe original container is of opaque material, or if it is more than three-fourths full, transfer the entire sample to a clear glass bottle having a capacity at least one third greater than the volume of the sample, and transfer all traces of sediment from the original container to the bottle by vigorous agitation of portions of the sample in the original container.
