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ASTM D4652-05(2012)

(Specification)

Standard Specification for Silicone Fluid Used for Electrical Insulation

Standard Specification for Silicone Fluid Used for Electrical Insulation

ABSTRACT
This specification covers silicone fluid, polydimethylsiloxane, for use in transformers, capacitors, and electronic assemblies as an insulating or cooling medium, or both. Physical, electrical, and chemical tests shall be conducted on the specimen to check for quality conformance. The silicone fluid shall conform to the color, flash point, fire point, pour point, refractive index, viscosity, specific gravity, weight of volatile matter, dielectric breakdown, disk electrodes, VDE electrodes, dissipation factor, volume resistivity, neutralization number, water content, and PCB content requirements.
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

General Information

Status
Historical
Publication Date
14-Oct-2012
ICS
29.035.20 - Plastics and rubber insulating materials
71.100.55 - Silicones
Technical Committee
D27 - Electrical Insulating Liquids and Gases
Drafting Committee
D27.02 - Gases and Non-Mineral Oil Liquids
Current Stage
Ref Project

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ASTM D4652-05(2012) - Standard Specification for Silicone Fluid Used for Electrical InsulationASTM D4652-05(2012) - Standard Specification for Silicone Fluid Used for Electrical Insulation
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ASTM D4652-05(2012) - Standard Specification for Silicone Fluid Used for Electrical Insulation
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D4652 −05 (Reapproved 2012)
Standard Specification for
1
Silicone Fluid Used for Electrical Insulation
This standard is issued under the fixed designation D4652; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope Gravity of Crude Petroleum and Liquid Petroleum Prod-
ucts by Hydrometer Method
1.1 This specification covers silicone fluid for use in
D1481 Test Method for Density and Relative Density (Spe-
transformers, capacitors, and electronic assemblies as an insu-
cific Gravity) of Viscous Materials by Lipkin Bicapillary
lating or cooling medium, or both.
Pycnometer
1.2 Silicone fluid covered by this specification is polydim-
D1533 Test Method for Water in Insulating Liquids by
ethylsiloxane having a nominal viscosity of 50 cSt at 25°C and
Coulometric Karl Fischer Titration
a fire point of 340°C or greater. This specification applies only
D1807 Test Methods for Refractive Index and Specific
to new silicone fluid. Information on in-service maintenance
Optical Dispersion of Electrical Insulating Liquids (With-
2
4
testing is available in appropriate guides.
drawn 2014)
D1816 Test Method for Dielectric Breakdown Voltage of
2. Referenced Documents
Insulating Liquids Using VDE Electrodes
3
2.1 ASTM Standards:
D2129 Test Method for Color of Clear ElectricalInsulating
D92 Test Method for Flash and Fire Points by Cleveland Liquids (Platinum-Cobalt Scale)
Open Cup Tester
D2161 Practice for Conversion of Kinematic Viscosity to
D97 Test Method for Pour Point of Petroleum Products Saybolt Universal Viscosity or to Saybolt Furol Viscosity
D445 Test Method for Kinematic Viscosity of Transparent
D2225 Test Methods for Silicone Fluids Used for Electrical
and Opaque Liquids (and Calculation of Dynamic Viscos- Insulation
ity)
D2864 Terminology Relating to Electrical Insulating Liq-
D664 Test Method for Acid Number of Petroleum Products
uids and Gases
by Potentiometric Titration
D4052 Test Method for Density, Relative Density, and API
D877 Test Method for Dielectric Breakdown Voltage of
Gravity of Liquids by Digital Density Meter
Insulating Liquids Using Disk Electrodes D4059 Test Method for Analysis of Polychlorinated Biphe-
D923 Practices for Sampling Electrical Insulating Liquids
nyls in Insulating Liquids by Gas Chromatography
D924 Test Method for Dissipation Factor (or Power Factor) D4559 Test Method for Volatile Matter in Silicone Fluid
and Relative Permittivity (Dielectric Constant) of Electri-
3. Terminology
cal Insulating Liquids
D974 Test Method for Acid and Base Number by Color-
3.1 Definitions and descriptions of terms specific to this
Indicator Titration
specification are given in Methods D2225 and Terminology
D1169 Test Method for Specific Resistance (Resistivity) of
D2864.
Electrical Insulating Liquids
D1298 Test Method for Density, Relative Density, or API
4. Sampling and Testing
4.1 Take all samples in accordance with Methods D923.
1 4.2 Test in accordance with the methods specified in Table
This specification is under the jurisdiction of ASTM Committee D27 on
Electrical Insulating Liquids and Gasesand is the direct responsibility of Subcom- 1.
mittee D27.02 on Gases and Non-Mineral Oil Liquids.
NOTE 1—Because of the different needs of the various users, items
Current edition approved Oct. 15, 2012. Published October 2012. Originally
relating to packaging, labeling, and quality assurance are subject to
approved in 1992. Last previous edition approved in 2005 as D4652 – 05. DOI:
buyer-seller agreement.
10.1520/D4652-05R12.
NOTE 2—In addition to all other tests listed herein, it is sound
2
IEEE C57.111, IEEE Guide forAcceptance of Silicone Insulating Fluid and its
engineering practice for the apparatus manufacturer to perform a func-
Maintenance inTransformers is published by the Insulating Fluids Subcommittee of
tional evaluation of silicone fluid in insulation systems, prototype
the IEEE Power Engineering Society Transformers Committee.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4
Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D4652−05 (2012)
TABLE 1 Detail Requirements for Silicone Fluid
Property Limit ASTM Test Method
Physical:
Color, max 15 D2129
Flash point,° C, min 300 D92
Fire point,
...

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