ELASTOSIL RT 747 TC is a silicone thermal potting from Wacker, rated 1.3 W/m·K. Typical uses: Potting automotive electronics, coils, electric drives, ECUs. Short answer: we dispense it with a PCP progressive cavity pump.
Material at a glance
| Manufacturer | Wacker |
|---|---|
| Type | Thermal potting |
| Chemistry | Silicone |
| Thermal conductivity | 1.3 W/m·K |
| Cure | 30 min at 130 °C or 15 min at 150 °C (10 mm) |
From the manufacturer's published data (source). Always work from the current technical data sheet.
How we dispense it
For a single-component thermal potting compound 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.
- Settling: heavy filler settles in the pail. Keeping the material agitated and recirculating, all the way to the pump, gives every pour the same filler content, and vacuum degassing keeps air out of the part.
- Heat cure: the material is stable at room temperature in the pump and cures in the oven after assembly.
See our PCP progressive cavity pumps, or use the pump configurator.
Frequently asked questions
What pump should I use to dispense ELASTOSIL RT 747 TC?
For a single-component thermal potting compound 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 ELASTOSIL RT 747 TC be fed from pails instead of cartridges?
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 ELASTOSIL RT 747 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 ELASTOSIL RT 747 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 ELASTOSIL RT 747 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
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ELASTOSIL RT 747 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.