VV-C-846D
4.4.2 Emulsion stability. Pour 95 mL of synthetic hard water (see 6.3.2) into a 100-mL glass- stoppered graduated cylinder. Cool the water to 45 °P ± 2 °P (7 °C ± 1 °C) and add 5 mL of emulsifiable oil that has passed the storage stability test (see 4.4.1). Agitate the contents vigorously by inverting the cylinder 100 to 120 times within a period of one minute. Allow the mixture to stand for 24 hours at room temperature 77 °P ± 5 °P (25 °C ± 3 °C) and examine it for separation and sedimentation.
4.4.3 Prothing. Pour 190 mL of reagent-grade water (see 6.3.1) into a 250-mL glass-stoppered graduated cylinder. Add 10 mL of emulsifiable oil. Agitate the contents vigorously by inverting the stoppered cylinder 100 to 120 times within a period of one minute. Allow the cylinder to stand for 15 minutes at a temperature of 77 °P ± 5 °P (25 °C ± 3 °C) and record the volume of froth at the top of the emulsion.
4.4.4 Gumming. Prepare 100 mL of emulsion as described in 4.4.2 and pour it into a 100-mL
beaker. Place the uncovered beaker in a forced draft oven maintained at 160 °P ± 5 °P
(71 °C ±3 °C) for 16 hours. Remove the beaker from the oven and allow it and the residue to
cool to room temperature. Add 10 mL of reagent-grade water and stir the contents vigorously for one minute with a glass rod. Examine the mixture for undissolved solids, polymerized particles, or gels. The presence of any one of these substances constitutes gumminess. If no gumminess is found, add 80 mL of reagent-grade water to the beaker and stir the contents for one minute. Transfer the mixture to a 100-mL glass-stoppered graduated cylinder that has one milliliter subdivisions and fill it to the 100-mL mark with reagent-grade water. Mix the contents by inverting the cylinder several times and allow it to stand for one hour. Examine the upper part of the fluid and record the volume of any separated oil.
4.4.5 Corrosion. The corrosion test shall be performed according to paragraphs 4.4.5.1 through
4.4.5.5. After completion of the corrosion test, examine and compare both the exposed and duplicate metal strips under 5X magnification to determine whether staining, pitting, or etching has occurred on the exposed strips.
4.4.5.1 Procedure. Prepare two strips, each measuring approximately 3 X 1/2 X 1/8 inches, of each type of metal listed in table IV in accordance with ASTM D 130. Using forceps, place one strip of each type of metal in a separate test tube that measures approximately 32 millimeters (mm) outside diameter by 2,000 mm in length. Place the duplicate strips in a bottle filled with the commercial grade normal hexane. Keep this bottle tightly stoppered until time to examine the strips. CAUTION: Normal hexane is flammable. Use only in a well ventilated area. Keep all flames away from the normal hexane.
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