H.B. Fuller EV Therm 601

H.B. Fuller EV Therm 601 is a one-component UV curable technology that is thermally conductive, flame retardant, and electrically insulative. This material provides an optimum coating with a minimum coating thickness of 150 microns and encapsulation protection for electronic assemblies and components. This material was designed to be thermally conductive and is recommended for use with heatsinks, heat spreaders, cold plates, cooling tubes, and other thermal dissipation applications.

Product Type: 1K (1 component) Coating, Conductive Coating, Radiation Curable Coating

Features: Electrically Insulating, Flame Retardant, Good Adhesion, High Dielectric Strength, LED-curable, Low Viscosity, Rapid Cycle Time, Room Temperature Curing, Thermally Conductive, UV Curable

Application Area: Electric Vehicle (EV), Electronic Components

Compatible Substrates & Surfaces: Metal, Plastics

Chemical Family: Acrylics & Acrylates

Technical Data Sheet
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Identification & Functionality

Features & Benefits

Ready-to-Use Product Features
Features and Benefits
  • One Component System for ease of application
  • Low viscosity and surface tension make it easy to dispense and degas, with reduced air bubbles.
  • Extremely low cure time allowing for improved production and cycle time
  • Thermally conductive.
  • High Dielectric Strength for Excellent Electrical Insulation
  • Very good adhesion to various metals and plastics without the need for primers.
  • Superior low and high temperature cycling performance.
  • This material is designed to meet the flammability requirements of UL-94 VO.

Applications & Uses

Application Area
Compatible Substrates & Surfaces
  • EV Therm 601 must be agitated before use and continuously during use to maintain uniformity of the material.
  • Equipment, brushes, and spillage can be cleaned promptly after use with isopropyl alcohol, MEK, or acetone.


Physical Form
Physical Properties of Cured Material
ValueUnitsTest Method / Conditions
Hardness50.0-ASTM D2240, Shore D
Thermal Conductivity1.8W/m.K-
Glass Transition Temperature-6.0°CDSC
Electrical Properties of Cured Material
ValueUnitsTest Method / Conditions
Dielectric Strength57.0kV/mmASTM D-0149
Dielectric Constant (at 1MHZ)4.72-ASTM D-0150
Dissipation Factor (at 1MHz)0.038-ASTM D-0150
Volume Resistivity1.9 x 10¹¹Ω.cmASTM D-0257
Surface Resistivity1.8 x 10¹²ohmASTM D-0257
Uncured Properties
ValueUnitsTest Method / Conditions

Technical Details & Test Data

Curing Profile

EV Therm 601 can be cured at room temperature using UVA light (315-400 nm) with a minimum energy of 1,000 mJ/cm2. Curing can be performed with metal halide, mercury, or LED lamps. Depending on UVA light intensity, cure speed can be less than 1 minute.

Packaging & Availability

Packaging Type
Regional Availability
  • Africa
  • Asia Pacific (Excluding Russia)
  • Europe (Excluding Russia)
  • India
  • Latin America
  • Middle East
  • North America
Available Packaging
  • 5 gal Pails
  • 55 gal Drums

Storage & Handling

Shelf Life
1 Year
Storage Conditions

EV Therm 601 should be stored in a cool, dry place, and must be protected from light. Shelf life is a minimum of one year in unopened containers when stored at 25°C. DO NOT purge opened containers with nitrogen.