Historical
ASTM D2225-04(2012)
Standard Test Methods for Silicone Fluids Used for Electrical Insulation
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.
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, D2161 |
| Chemical: | ||
| Neutralization number | 14 | D974 |
| Water content | 15 | D1533 |
| Electrical: | ||
| Relative permittivity | 16 | D924 |
| Dielectric breakdown voltage | 17 | D877 |
| Dissipation factor | 18 | D924 |
| Specific resistance | 19 | D1169 |
| 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 and health practices and determine the applicability of regulatory limitations prior to use.
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ASTM International [astm]
