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Electrical Insulation

Application Guide

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3M ThermaVolt and ThermaVolt AR Calendared Insulating Papers are inorganicbased papers developed to meet the high performance required for use in hightemperature, dry-type transformers. They offer good dielectric characteristics and thermal conductivity – making them especially suitable for use as interwinding insulation in strip-wound and wire-wound coils.

Applications of ThermaVolt And TVAR

  • Applications
  • High Temperature Electrical Insulation for:
  • Dry-type transformers, coils and reactors
  • Ground Insulation
  • Phase Insulation
  • Layer Insulation
  • Interwinding for foil-wound designs
  • Electromagnet Coils

3M ThermaVolt Calendared Inorganic Insulating Pape

Interwinding Insulation with Thermavolt

The high thermal conductivity of ThermaVolt papers helps achieve the heatdissipation required in today’s high efficiency electrical apparatus, allowing the
design of smaller, more cost effective equipment. It has been designed for use as major ground insulation in electrical insulation systems up to Class 220(R).
Features and Benefits

Features & Benefits

  • UL Systems Recognition through Class 220 (R)
  • High Inorganic Content
  • Excellent Thermal Conductivity
  • Good Dielectric Breakdown Resistance
  • Cost effective with improved processability
  • Low Moisture Absorption
  • Thicknesses: 2 mils (.08mm) to 10 mils (.25mm)
  • Good Retained Dielectrics


3M ThermaVolt AR Electrical Insulation Paper

3M ThermaVolt AR (TVAR) Electrical Insulation Paper is a significant advancement in electrical insulation. This proprietary paper combines the longrecognized
advantages of inorganic paper with improved mechanical properties. The result is a stable high-temperature insulating paper with excellent retained
flexibility. Its toughness and dielectric strength allows for use in single-ply form for a variety of electrical insulation applications that require high-temperature systems up to class 220(R).