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Xiameter PMX-561 Transformer Liquid

Xiameter PMX-561 (formerly Dow Corning 561 Silicone Transformer Liquid) is a polydimethyl silicone liquid used for cooling and insulating transformers and other electrical equipment.

Xiameter PMX-561 Transformer Liquid

Xiameter PMX-561 has excellent electrical insulation properties over a wide temperature range, combined with high thermal stability.

The product can be used as an alternative to organic transformer oil.

Xiameter PMX-561 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 was previously called Dow Corning 561 Silicone Transformer Liquid.


  • Suitable for transformers and other electrical equipment designed to operate at high temperatures or at very low temperatures.


  • Meets the requirements of IEC 60836 and ASTM D 4652-92
  • Silicon Oil
  • Essentially non-toxic
  • Environmentally safe
  • Compatible with a wide range of solid electrical insulating materials
  • Contains no additives
  • 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 operating capabilities over a wide temperature range
  • Non-sludging

This product is part of the Xiameter range

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