H.B. Fuller EV Therm 440 GB

H.B. Fuller EV Therm 440 GB 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. It allows control of the adhesive gap to a diameter of 0.25mm (0.01").

Product Type2K (2 component) Adhesive, Reactive Adhesive, Structural Adhesive

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

Cure MethodAir Dry

Chemical FamilyAcrylics & Acrylates

Technical Data Sheet

Enhanced TDS

Identification & Functionality

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

Features & Benefits

Key Attributes
  • No Surface Preparation Required
  • Excellent Strength to Metals, E-Coat, Thermoplastics, Thermosets, and Engineering Plastics
  • Suitable for Easy Manual and Pneumatic Dispensing
  • UL94 V0 Flame Retardancy
  • 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

Cure Method
Application Instructions

General Information

  • 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.

Handling and Clean-Up

  • 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.


Typical Properties
ValueUnitsTest Method / Conditions
Mixed Density1.67g/cm³
Volume Mix Ratio10:1
Weight Mix Ratio14:1
Thermal Properties
ValueUnitsTest Method / Conditions
Thermal Service Range-67 - 212°F
Cured Properties
ValueUnitsTest Method / Conditions
Over Lap Shear Strength (Aluminum, at 25°C, 50% RH)15MPaASTM D1002
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
Hardness70.0Shore D, ASTM D2240
Thermal Conductivitymin. 1.0W/m-K
Flame RetardancyUL94 V0
Dielectric Strength22.1 - 23.9KV/mm
Elongation (at Break)min. 4%
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 (20 rpm, Resin, at 25°C)100,000 - 200,000cPsBrookfield RV7
Viscosity (20 rpm, Activator, at 25°C)40,000 - 80,000cPsBrookfield RV7

Packaging & Availability

Packaging Type
Regional Availability
  • North America
Packaging Information

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

Storage & Handling

Shelf Life
9 Months
Storage Conditions

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.