Significance and Use
4.1 Tests covered in this standard may be used for quality control and design considerations.
4.2 Included in each test method is a brief statement describing its significance.
Scope
1.1 These 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.
1.2 Although some of the test methods listed here apply primarily to petroleum-based fluids, they are, with minor revisions, equally applicable to silicone liquids.
1.3 Silicone liquids are used for electrical insulating purposes because of their stable properties at high and low temperatures and their relative environmental inertness.
1.4 A 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
1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.6 This 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.
