ASTM D2225-04

    Standard Test Methods for Silicone Fluids Used for Electrical Insulation


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    1. Scope

    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 D 2129 Flash point 7 D 92 Fire point 7 D 92 Polychlorinated biphenyl 8 D 4059 content Pour point 9 D 97 Refractive index 10 D 1807 Specific gravity 11 D 1298, D 1481, D 4052 Volatility 12 D 4559 Viscosity 13 D 445, D 2161 Chemical: Neutralization number 14 D 974 Water content 15 D 1533 Electrical: Relative permittivity 16 D 924 2 Dielectric breakdown 17 D 877 3 voltage Dissipation factor 18 D 924 2 Specific resistance 19 D 1169 2 Compatibility 20 D 5282

    1.5This standard does not purport to address all of the safety problems, 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.


    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 ElectricalInsulating Liquids (Platinum-Cobalt Scale)

    D2161 Practice for Conversion of Kinematic Viscosity to Saybolt Universal Viscosity or to Saybolt Furol Viscosity

    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 Fluid 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
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/D2225-04

    Citation Format

    ASTM D2225-04, Standard Test Methods for Silicone Fluids Used for Electrical Insulation, ASTM International, West Conshohocken, PA, 2004, www.astm.org

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