ASTM D4652 Specification for Silicone Fluid Used for Electrical Insulation
1. Scope
1.1 This specification covers silicone fluid for use in transformers, capacitors, and electronic assemblies as an insulating or cooling medium, or both.
1.2 Silicone fluid covered by this specification is polydimethylsiloxane having a nominal viscosity of 50 cSt at 25°C and a fire point of 340°C or greater. This specification applies only to new silicone fluid. Information on in-service maintenance testing is available in appropriate guides.
2. Referenced Documents
2.1 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)
D664 Test Method for Acid Number of Petroleum Products by Potentiometric Titration
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 (Specific Gravity), 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
D2225 Test Methods for Silicone Fluids Used for Electrical Insulation
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
3. Terminology
3.1 Definitions and descriptions of terms specific to this specification are given in Methods D2225 and Terminology D2864.
