ASTM D971-12
Standard Test Method for Interfacial Tension of Oil Against Water by the Ring Method

Standard No.

ASTM D971-12

Release Date

2012

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM D971-20

Latest

ASTM D971-20

Scope

Interfacial tension measurements on electrical insulating oils provide a sensitive means of detecting small amounts of soluble polar contaminants and products of oxidation. A high value for new mineral insulating oil indicates the absence of most undesirable polar contaminants. The test is frequently applied to service-aged oils as an indication of the degree of deterioration.

FIG. 1 Interfacial Tensiometer

FIG. 2 Top View of Interfacial Tensiometer

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.

ASTM D971-12 Referenced Document

• ASTM D117 Standard Guide for Sampling, Test Methods, Specifications, and Guide for Electrical Insulating Oils of Petroleum Origin
• ASTM D2285 Standard Test Method for Interfacial Tension of Electrical Insulating Oils of Petroleum Origin Against Water by the Drop-Weight Method
• ASTM D923 Standard Practices for Sampling Electrical Insulating Liquids

ASTM D971-12 history

• 2020 ASTM D971-20 Standard Test Method for Interfacial Tension of Insulating Liquids Against Water by the Ring Method
• 2012 ASTM D971-12 Standard Test Method for Interfacial Tension of Oil Against Water by the Ring Method
• 1999 ASTM D971-99a(2004) Standard Test Method for Interfacial Tension of Oil Against Water by the Ring Method
• 1999 ASTM D971-99a Standard Test Method for Interfacial Tension of Oil Against Water by the Ring Method
• 1991 ASTM D971-91 Standard Test Method for Interfacial Tension of Oil Against Water by the Ring Method