ASTM D2225 - 20
Standard Test Methods for Silicone Liquids Used for Electrical Insulation
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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.
1. 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 | 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 | 17 | D8773 |
| Dielectric breakdown | 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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
D92 Test Method for Flash and Fire Points by Cleveland Open Cup Tester
D97 Test Method for Pour Point of Petroleum Products
D445 Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity)
D877 Test Method for Dielectric Breakdown Voltage of Insulating Liquids Using Disk Electrodes
D923 Practices for Sampling Electrical Insulating Liquids
D924 Test Method for Dissipation Factor (or Power Factor) and Relative Permittivity (Dielectric Constant) of Electrical Insulating Liquids
D974 Test Method for Acid and Base Number by Color-Indicator Titration
D1169 Test Method for Specific Resistance (Resistivity) of Electrical Insulating Liquids
D1298 Test Method for Density, Relative Density, or API Gravity of Crude Petroleum and Liquid Petroleum Products by Hydrometer Method
D1481 Test Method for Density and Relative Density (Specific Gravity) of Viscous Materials by Lipkin Bicapillary Pycnometer
D1533 Test Method for Water in Insulating Liquids by Coulometric Karl Fischer Titration
D1807 Test Methods for Refractive Index and Specific Optical Dispersion of Electrical Insulating Liquids
D1816 Test Method for Dielectric Breakdown Voltage of Insulating Liquids Using VDE Electrodes
D2129 Test Method for Color of Clear Electrical Insulating Liquids (Platinum-Cobalt Scale)
D2864 Terminology Relating to Electrical Insulating Liquids and Gases
D4052 Test Method for Density, Relative Density, and API Gravity of Liquids by Digital Density Meter
D4059 Test Method for Analysis of Polychlorinated Biphenyls in Insulating Liquids by Gas Chromatography
D4559 Test Method for Volatile Matter in Silicone Fluid
D4652 Specification for Silicone Liquid Used for Electrical Insulation
D5282 Test Methods for Compatibility of Construction Material with Silicone Fluid Used for Electrical Insulation
ICS Code
ICS Number Code 29.040.10 (Insulating oils)
UNSPSC Code
UNSPSC Code 12352310(Silicones)
Referencing This Standard
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DOI: 10.1520/D2225-20
Citation Format
ASTM D2225-20, Standard Test Methods for Silicone Liquids Used for Electrical Insulation, ASTM International, West Conshohocken, PA, 2020, www.astm.org
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