SEMICOSIL 971 TC is a silicone 1K thermal adhesive from Wacker, rated 2 W/m·K. Typical uses: Thermally conductive bonding in power/automotive electronics. Short answer: we dispense it with a PCP progressive cavity pump.
Material at a glance
| Manufacturer | Wacker |
|---|---|
| Type | 1K thermal adhesive |
| Chemistry | Silicone |
| Thermal conductivity | 2 W/m·K |
| Viscosity | 100,000 mPa·s |
| Packages | cartridges only |
From the manufacturer's published data (source). Always work from the current technical data sheet.
How we dispense it
For a single-component thermally conductive adhesive we start with a PCP progressive cavity pump, fed from a cartridge for lab and low volume, or from a pail with a follower-plate pail pump for production. A progressive cavity pump meters by volume, so dot and bead size stay consistent. Pump size depends on your dot 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.
See our PCP progressive cavity pumps, or use the pump configurator.
Frequently asked questions
What pump should I use to dispense SEMICOSIL 971 TC?
For a single-component thermally conductive adhesive we start with a PCP progressive cavity pump, fed from a cartridge for lab and low volume, or from a pail 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 SEMICOSIL 971 TC be fed from pails instead of cartridges?
Wacker lists these packages: cartridges only. Cartridges suit lab and low volume. Above that, a follower-plate pail pump feeds the metering pump directly, which cuts container changes and waste.
Does SEMICOSIL 971 TC need mixing?
No. It is a single-component material, so there is no mixer and no ratio to hold. The job is accurate, repeatable volumetric metering, which is what a progressive cavity pump does.
Will SEMICOSIL 971 TC 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 SEMICOSIL 971 TC, 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
- SEMICOSIL 9720 TC · Wacker, 1K 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
- CoolTherm TC-2002 · Parker LORD, 2K thermal adhesive (structural)
All thermal interface materials · Materials we've dispensed
SEMICOSIL 971 TC is a trademark of Wacker or its affiliates. Dispense Robotics is not affiliated with the manufacturer; the name is used to describe the material our equipment dispenses.