EV Therm 441 / 441GB is an acrylic 2K thermal adhesive from H.B. Fuller, rated 1.0 W/m·K. Typical uses: Battery packs and energy storage (UL94 V-0); 441GB has glass beads for 0.25 mm bondline. Short answer: we dispense it with a PDP two-component progressive cavity metering pump with a static mixer.
Material at a glance
| Manufacturer | H.B. Fuller |
|---|---|
| Type | 2K thermal adhesive |
| Chemistry | Acrylic |
| Thermal conductivity | 1.0 W/m·K |
| Mix ratio | 10:1 by volume; 14:1 by weight |
| Viscosity | Resin 100,000-200,000 cPs; activator 40,000-80,000 cPs (25°C) |
| Cure | Room temp 24 h; fixture 30-50 min; open time 18-23 min |
| Packages | 50 ml, 490 ml, pail and drum kits |
From the manufacturer's published data (source). Always work from the current technical data sheet.
How we dispense it
For a two-component thermally conductive adhesive we start with a PDP two-component progressive cavity metering pump and a disposable static mixer, fed from dual cartridges for lab and low volume, or from pails with a follower-plate pail pump for production. Pump size depends on your shot or bead size and cycle time.
- Abrasion: the ceramic filler that carries the heat wears pumps out. We use tungsten carbide rotors and wear-resistant stators and run the pump slowly, at 8 to 12 rpm, for long wear life.
- Ratio: each side is metered by its own progressive cavity pump to within ±1%. Check ratio by weighing a shot from each side every week, because filled materials vary from batch to batch.
- Mixing: a disposable static mixer does the mixing. Purge or change it before the material's working life runs out.
See our PDP two-component metering pumps, or use the pump configurator.
Frequently asked questions
What pump should I use to dispense EV Therm 441 / 441GB?
For a two-component thermally conductive adhesive we start with a PDP two-component progressive cavity metering pump and a disposable static mixer, fed from dual cartridges for lab and low volume, or from pails with a follower-plate pail pump for production. Pump size depends on your shot or bead size and cycle time; send us those and we will size it.
Can EV Therm 441 / 441GB be fed from pails instead of cartridges?
H.B. Fuller lists these packages: 50 ml, 490 ml, pail and drum kits. Cartridges suit lab and low volume. Above that, a follower-plate pail pump feeds the metering pump directly, which cuts container changes and waste.
How do you keep EV Therm 441 / 441GB on ratio?
Each side is metered by its own progressive cavity pump, held to within ±1% per side. We recommend a weekly check: weigh a shot from each side and adjust, because filled materials vary from batch to batch.
Will EV Therm 441 / 441GB wear out the pump?
Thermally conductive fillers are abrasive. With tungsten carbide rotors, wear-resistant stators and pump speeds of 8 to 12 rpm, stators typically last 6 to 12 months and rotors up to 24 months, and a pump rebuild takes under an hour.
Talk it through with us
Running EV Therm 441 / 441GB, or about to? Send us the technical data sheet, your bead or shot size and your cycle time, and we'll recommend a pump and feed system. We can run an application test on your material before you buy. Contact us
Related materials
- EV Therm 440 / 440GB · H.B. Fuller, 2K thermal adhesive
- EV Therm 420 · H.B. Fuller, 2K thermal adhesive
- BERGQUIST LIQUI BOND TLB SA2000 (Liqui-Bond SA 2000) · Henkel Bergquist, 1K thermal adhesive
- LOCTITE TLB 9300 APSi · Henkel Loctite, 2K thermal adhesive (structural, EV battery)
- LOCTITE TLB 9270APS · Henkel Loctite, 2K thermal adhesive (EV battery)
- CoolTherm UR-2000 · Parker LORD, 2K gap filler / thermal adhesive
All thermal interface materials · Materials we've dispensed
EV Therm 441 / 441GB is a trademark of H.B. Fuller or its affiliates. Dispense Robotics is not affiliated with the manufacturer; the name is used to describe the material our equipment dispenses.