1.1 These test methods cover the testing of silicone fluids for use in transformers, capacitors, and electronic assemblies as an insulating or cooling medium, or both. These methods are generally suitable for specification acceptance, 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 fluids.
1.3 Silicone fluids are used for electrical insulating purposes because of their stable properties at high and low temperatures and their relative environmental inertness.
Property Measured | Section | ASTM Test Method |
Physical: |
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Color | 6 | |
Flash point | 7 | |
Fire point | 7 | |
Polychlorinated biphenyl | 8 | |
Pour point | 9 | |
Refractive index | 10 | |
Specific gravity | 11 | |
Volatility | 12 | |
Viscosity | 13 | |
Chemical: |
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|
Neutralization number | 14 | |
Water content | 15 | |
Electrical: |
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Relative permittivity | 16 | |
Dielectric breakdown | 17 | |
Dissipation factor | 18 | |
Specific resistance | 19 | |
Compatibility | 20 |