H.B. Fuller EV Therm 441

H.B. Fuller EV Therm 441 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. H.B. Fuller EV Therm 441 is an excellent flame retardant with a UL94 V0 rating.

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

Compatible Substrates & Surfaces: Acrylic, Acrylonitrile Butadiene Styrene (ABS), Aluminum, E-Coated Surfaces, Engineering Plastics, Epoxies, Fiberglass, Gelcoat, Metal, Nylon, Phenolics, Plated Steel, Poly(p-Phenylene Oxide) (PPO), Polyamide, Polybutylene Terephthalate (PBT), Polycarbonate (PC), Polyether Ether Ketone (PEEK), Polyethylene Terephthalate (PET), Polystyrene (PS), Polyurethane, Polyvinyl Chloride (PVC), RIM Urethane, Stainless Steel, Thermoplastics, Thermosetting Plastics, Vinyl

Application Method: Dispensing Equipment, Pneumatic Gun

Chemical Family: Acrylics & Acrylates

Features: Ease Of Use, Excellent Multi-Substrate Adhesion, Excellent Performance, Excellent Strength, Excellent Toughness, Flame Retardant, Good Adhesion, Good Bonding Strength, Good Thermal Conductivity, High Impact Resistance, High Viscosity, Room Temperature Curing

Technical Data Sheet
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Enhanced TDS

Identification & Functionality

Features & Benefits

Ready-to-Use Product Features
Key Attributes
  • Thermally Conductive
  • No Surface Preparation Required
  • Excellent Adhesion Properties
  • Excellent Strength to Metals, E-Coat, Thermoplastics, Thermosets, and Engineering Plastics
  • High Impact Resistance
  • 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 as received metal surfaces including aluminum, stainless and plated steels and forms tough, high strength bonds without surface preparation

Applications & Uses

Application Method
Compatible Substrates & Surfaces
General Instructions
  • 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

Metals:

  • Aluminum
  • Steel
  • Stainless
  • E-Coated Metal

Thermosets:

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

Thermoplastics:

  • Acrylic
  • ABS
  • Polycarbonate
  • Nylon/PA*
  • PPO*
  • Vinyl*
  • PVC
  • Styrene
  • Peek
  • PBT Blends*
  • PET Blends

*Surface treatment may be needed.

Properties

Color (Properties)
Flame Rating
Physical Form
Appearance
Blue viscous liquid
Cured Mechanical Properties
ValueUnitsTest Method / Conditions
Hardness65.0-ASTM D2240, Shore D
Over Lap Shear Strength (Carbon steel, at 25°C, 50% RH)13.1MPaASTM D1002
Over Lap Shear Strength (Aluminum 2024, at 25°C, 50% RH)13.1MPaASTM D1002
Over Lap Shear Strength (Aluminum 6061)13.8MPa-
Over Lap Shear Strength (Nickle coated low - carbon steel plated, at 25°C, 50% RH)17.2MPaASTM D1002
Thermal Conductivity1.0W/(m.K)-
Flame RetardancyUL94 V0--
Dielectric Strength18.1 - 19.9kV/mm-
Elongation (at Break)4 - 6%-
Cured Thermal Properties
ValueUnitsTest Method / Conditions
Thermal Service Range(-67) - (212)°F-
Technical Data
ValueUnitsTest Method / Conditions
Mixed Density1.55g/cc-
Uncured Properties
ValueUnitsTest Method / Conditions
Flash Pointmin. 200°F-
Open Time18 - 23minutes-
Fixture Time30 - 50minutes-
Cure TemperatureRoom Temperature--
Cure Time24.0hr-
Recommended Mixing and Handling Parameters
ValueUnitsTest Method / Conditions
Volume Mix Ratio10:1--
Weight Mix Ratio14:1--
Rheological Properties
ValueUnitsTest Method / Conditions
Viscosity (at 25°C, resin, 20 rpm)100,000 - 200,000cPsBrookfield RV7
Viscosity (at 25°C, activator, 20 rpm)40,000 - 80,000cPsBrookfield RV7

Regulatory & Compliance

Certifications & Compliance

Packaging & Availability

Packaging Type
Typical Packaging Information
  • EV Therm 441 is conveniently packaged in 50 ml, 490 ml, pail, and drum kits.
  • Special packaging is available upon request.
Typical Packaging Information

EV Therm 441 is conveniently packaged in 50 ml, 490 ml, pail, and drum kits. Special packaging is available upon request.

Storage & Handling

Shelf Life
9 months
Handling and Clean-Up Information
  • 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.
Storage Conditions
  • Product should be stored in a cool dry place out of direct sunlight.
  • The shelf life of EV Therm 441 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.