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Demulsibility

ASTM method - D1401

Measures the ability of a lubricant to separate from water.


Operating Principle. Combine 40 ml of distilled water with 40 ml of oil in a graduated cylinder. Place in a constant temperature bath and stir for 5 minutes. The amount of oil separation is recorded at 5 minute intervals over a period of 60 minutes. Failure is considered an emulsion layer greater than 3ml at the end of the test.

The results are reported as such: [40-40-0 (60)]

ml
Oil		 ml
Water		 ml
Emulsions		 Minutes
40 40 0 60

After 60 minutes this sample passed. It contained 40 ml of oil, 40 ml of water and 0 emulsion. This sample separates water and therefore, has good demulsibility.

Significance. Lubricating oils used in circulating systems should separate readily from water that may enter the system as a result of condensation or other means. If the water separates easily, it will settle to the bottom of the reservoir where it can be periodically drained.

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Insight Services, Inc.  •  20338 Progress Drive  •  Strongsville, OH 44149  •  Phone: 216-251-2510  •  Fax: 216-251-2515
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