1.1These test methods cover the testing of silicone liquids for use in transformers, capacitors, and electronic assemblies as an insulating or cooling medium, or both. These methods are generally suitable for specification acceptance (Specification D4652), factory control, referee testing, and research.

1.2Although some of the test methods listed here apply primarily to petroleum-based fluids, they are, with minor revisions, equally applicable to silicone liquids.

1.3Silicone liquids are used for electrical insulating purposes because of their stable properties at high and low temperatures and their relative environmental inertness.

1.4A list of the properties and standards are as follows:

Property Measured	Section	ASTM Test Method
Physical:
Color	6	D2129
Flash point	7	D92
Fire point	7	D92
Polychlorinated biphenyl content	8	D4059
Pour point	9	D97
Refractive index	10	D1807
Specific gravity	11	D1298, D1481, D4052
Volatility	12	D4559
Viscosity	13	D445
Chemical:
Acid number	14	D974
Water content	15	D1533
Electrical:
Relative permittivity	16	D9242
Dielectric breakdown voltage	17	D8773
Dielectric breakdown voltage	17	D1816
Dissipation factor	18	D9242
Specific resistance	19	D11692
Compatibility	20	D5282

1.5This 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.6This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.