Xiameter PMX561 Silicone Transformer Fluid

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DATASHEET (55.25 kB)


Dow Corning® 561 Silicone Transformer Fluid is an ideal safety fluid for use in oil filled transformers and be used safely even when the transformer must be located close to the load, indoors or near buildings.

561 Transformer Fluid contains no chlorine or other halogens. It is pure polydimethylsiloxane material that contains no additives. It is compatible with materials used in the construction of transformers, non-volatile, thermally stable and chemically inert. This helps to prolong the life of the transformer and helps reduce maintenance.

561 Transformer fluid has been tested and approved by authorities around the world for use in electrical applications. Due to its high fire point it is extremely difficult to ignite but, if it should burn, its emissions are extremely low, and it is self-extinguishing.

Technical Info

Tested to ASTM4652-92

Appearance - Crystal clear liquid
Density at 25°C (77°F) kg/dm3 0.96
Viscosity at 25°C (77°F) mm2/s 50
Water content ppm 30
Specific heat kJ/kg.K 1.51
Thermal conductivity W/(m.K) 0.151
Refractive index at 25°C (77°F)  - 1.404
Breakdown voltage* kV 50
Permittivity at 25°C (77°F) – 50Hz - 2.7
Dissipation factor at 25°C (77°F) -50Hz -  0.0001
Volume resistivity at 25°C (77°F)  ohm.cm  1.0x1014 
Flash point open cup °C >300
  °F >572
Fire point open cup °C 370
  °F 698

*Breakdown voltage measured as in IEC 156:1995 section 3.4.2

Material Data

XIAMETER® PMX-561 Transformer Liquid is a polydimethyl silicone liquid that meets the requirements of:

  • International Electrotechnical Commission (IEC) 836 “specifications for silicone liquid for electrical purposes” (Silicone Type T-1).
  • ASTM D 4652-92 “silicone fluids for electrical insulation”.
  • IEC 1100 – “Classification of insulating liquids according to fire point and net calorific value” (Class K3).

XIAMETER PMX-561 Transformer Liquid has a fire point exceeding the requirements of these documents and is within the IEC 1100 class with lowest net calorific value (heat of combustion).

With excellent electrical insulation properties over a wide temperature range, combined with high thermal stability, XIAMETER PMX-561 Transformer Liquid is suitable for transformers and other electrical equipment designed to operate at high temperatures or at very low temperatures. 


Cooling and insulating liquid for transformers and other electrical equipment

Features and Benefits

  • Meets the requirements of both IEC 836 and ASTM D
  • Essentially non-toxic
  • Environmentally safe
  • Non-halogenated
  • Compatible with a range of solid electrical insulating materials
  • Contains no additives
  • Classified as non-hazardous
  • High thermal stability and oxidation resistance
  • Higher fire point and lower heat release rate than other types of class K insulating liquids
  • Good electrical properties and operation capabilities over a wide temperature range
  • Non-sludging

Price Matrix

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