ASTM D971 for Interfacial Tension of Oil Against Water by the Ring Method
1. Scope
1.1 This test method covers the measurement of the interfacial tension between mineral oil and water, under non-equilibrium conditions.

1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents
2.1 ASTM Standards:
D117 Guide to Test Methods and Specifications for Electrical Insulating Oils of Petroleum Origin
D923 Test Method for Sampling Electrical Insulating Liquids
D2285 Test Method for Interfacial Tension of Electrical Insulating Oils of Petroleum Origin Against Water by the Drop-Weight Method