EXPLANATION
This test method provides a guide for determining the demulsibility characteristics of lubricating oils that are prone to water contamination and that may encounter the turbulence of pumping and circulation capable of producing water-in-oil emulsions. This test method is intended for use in testing medium and high-viscosity lubricating oils.
TEST SUMMARY
A 405-mL sample of oil and 45 mL of distilled water are stirred together for 5 min at 180° F (82° C) in a special graduated separatory funnel. After a 5-h settling period the percentage of water in the oil, the volumes of water, and emulsion separating from the oil are measured and recorded.
A modification of this procedure for evaluating oils containing extreme pressure additives is also available. The modifications include volume of oil 360 mL, volume of distilled water 90 mL, and a stirring speed 2500 +/- 250 r/min.
TEST PRECISION
This test method has no bias.