H.B. Fuller EV Therm 440

H.B. Fuller EV Therm 440 is a modified, highly engineered structural acrylic adhesive designed to provide excellent thermal conductivity while maintaining superior strength and performance properties across a wide range of temperatures and substrates. EV Therm 440 is an excellent flame retardant with a UL94 V0 rating. EV Therm 440GB allows control of the adhesive gap to a diameter of 0.25mm (0.01").

Product Type: 2K (2 component) Adhesive, Reactive Adhesive, Structural Adhesive

Application Area: Electric Vehicle (EV)

Compatible Substrates & Surfaces: Acrylic, Acrylonitrile Butadiene Styrene (ABS), Aluminum, Coated Surfaces, Epoxies, Fiberglass, Metal, Phenolics, Polycarbonate (PC), Polyurethane, RIM Urethane, Stainless Steel

Chemical Family: Acrylics & Acrylates

Features: Excellent Strength, Excellent Substrate Adhesion, Excellent Toughness, Flame Retardant, Good Adhesion, Good Thermal Conductivity, High Impact Resistance

Technical Data Sheet
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Identification & Functionality

Chemical Family
Product Type
Product Families
Product Information
Technology/Base Modified Acrylic
Type of Product Structural Adhesive
Components Two Component
Curing Room Temperature Cure
Consistency Viscous Liquid

Features & Benefits

Ready-to-Use Product Features
Key Attributes
  • No Surface Preparation Required
  • Excellent Strength to Metals, E-Coat, Thermoplastics, Thermosets, and Engineering Plastics
  • Suitable for Easy Manual and Pneumatic Dispensing
  • 100% Reactive
  • Room Temperature Cure
  • 10:1 meter-mix product for ease of application
  • Use on aluminum, stainless and plated steels forms tough, high strength bonds without surface preparation

Applications & Uses

Application Area
Compatible Substrates & Surfaces
Cure Method
Application Method
  • The product is best used at temperatures between 65°F and 80°F. Temperatures below 65°F will slow the cure speed of the material and viscosities will be higher.
  • Temperatures above 80°F will cause the material to cure faster and viscosities will be lower. For consistent dispensing maintain temperature in the above mentioned range.
  • For optimum bond strength and to insure maximum performance in the finished assembly mate parts together within the specified work time of the adhesive. Make sure the bond joint has uniform coverage and that a sufficient amount of adhesive is in the bond area.
  • It is important to have the adhesive applied, parts aligned and positioned, within the established work times for the product. To ensure maximum performance in the finished assembly parts should remain undisturbed until the fixture time is reached.
Suitable Substrates


  • Aluminum
  • Steel
  • Stainless
  • E-Coated Metal


  • Acrylic
  • ABS
  • Polycarbonate


  • Fiberglass
  • Phenolic
  • Gel Coat
  • Epoxy
  • RIM Urethane
  • Polyurethane
  • Liquid Molding Resin


Typical Properties
ValueUnitsTest Method / Conditions
Mixed Density1.67g/cc-
Volume Mix Ratio10:1--
Weight Mix Ratio14:1--
Cured Properties
ValueUnitsTest Method / Conditions
Over Lap Shear Strength (Carbon steel, at 25°C, 50% RH)15MPaASTM D1002
Over Lap Shear Strength (Nickel coated low carbon steel plated, at 25°C, 50% RH)20MPaASTM D1002
Hardness70.0ASTM D2240, Shore D
Over Lap Shear Strength (Aluminum, at 25°C, 50% RH)15MPaASTM D1002
Thermal Conductivitymin. 1.0W/m-K-
Flame RetardancyUL94 V0--
Dielectric Strength22.1 - 23.9kV/mm
Elongation at Breakmin. 4%-
Thermal Service Range-67 - 212°F-
Uncured Properties
ValueUnitsTest Method / Conditions
Flash Pointmin. 200°F-
Open Time18 - 23minutes-
Fixture Time40 - 50minutes-
Cure TemperatureRoom temperature--
Cure Time24.0hours-
Rheological Properties
ValueUnitsTest Method / Conditions
Viscosity (at 25°C, resin, RV7, 20 rpm)100,000 - 200,000cPsBrookfield
Viscosity (at 25°C, activator, RV7, 20 rpm)40,000 - 80,000cPsBrookfield

Packaging & Availability

Packaging Type
Regional Availability
  • Africa
  • Asia Pacific (Excluding Russia)
  • Europe (Excluding Russia)
  • India
  • Latin America
  • Middle East
  • North America
Typical Packaging

EV Therm 440 is conveniently packaged in 50 ml, 490 ml, pail, and drum kits. Special packaging is available upon request.

Storage & Handling

Storage & Handling Information
  • Product should be stored in a cool dry place out of direct sunlight. The shelf life of EV Therm 440 is 9 months from date of manufacture. Shelf life is based on the products being stored properly at temperatures between 55°F and 75°F. Exposure to temperatures above 75°F will reduce the shelf life. This product should never be frozen.
  • Clean up is best before the adhesive has cured. Cleaners containing NMP (N-methyl pyrolidone) or Citrus terpene provide the best results. On cured adhesive repeat use may be required.