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ASTM D4652-20

Current Revision

Standard Specification for Silicone Liquid Used for Electrical Insulation

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1.1 This specification covers silicone liquid for use in transformers, capacitors, and electronic assemblies as an insulating or cooling medium, or both.

1.2 Silicone liquid covered by this specification is polydimethylsiloxane having a nominal viscosity of 50 mm2/s at 25°C and a fire point of 340°C or greater. This specification applies only to new silicone liquid. Information on in-service maintenance testing is available in appropriate guides.2

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.4 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.


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.


SDO ASTM: ASTM International
Document Number D4652
Publication Date Nov. 1, 2020
Language en - English
Page Count 2
Revision Level 20
Supercedes
Committee D27.02
Publish Date Document Id Type View
Nov. 1, 2020 D4652-20 Revision
Oct. 1, 2005 D4652-05 Revision
Oct. 15, 2012 D4652-05R12 Reaffirmation
April 10, 1997 D4652-92R97 Reaffirmation