CoolTherm EP-3500 is an epoxy thermal potting / encapsulant from Parker LORD, rated 3.3 W/m·K. Typical uses: Encapsulating motor stators, transformer coils and devices needing rigid, high-conductivity, low-CTE potting. Short answer: we dispense it with a Material Feeding System (MFS) that agitates and recirculates the material, feeding a PDP two-component progressive cavity metering pump.
Material at a glance
| Manufacturer | Parker LORD |
|---|---|
| Type | Thermal potting / encapsulant |
| Chemistry | Epoxy |
| Thermal conductivity | 3.3 W/m·K |
| Mix ratio | 1:1 by weight and volume with EP-3500 hardener; 100:78 by volume (100:72 by weight) with EP-2000 hardener |
| Viscosity | @ 60 °C: resin 9,200 cP; mixed 8,000 cP (EP-3500 hdnr) / 3,800 cP (EP-2000 hdnr); working life >3 h @ 60 °C |
| Cure | Handling strength 2 h @ 110 °C; full cure 2 h each @ 120, 150, 180 and 210 °C |
From the manufacturer's published data (source). Always work from the current technical data sheet.
How we dispense it
For a two-component potting material we start with a PDP two-component progressive cavity metering pump fed by a Material Feeding System (MFS) that agitates and recirculates both sides, with heat and vacuum degassing when the material calls for it. Pump size depends on your shot size and pour 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.
- 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.
See our PDP two-component metering pumps and the Material Feeding System (MFS), or use the pump configurator.
How the MFS keeps filler in suspension
The Material Feeding System agitates and recirculates the material so heavy filler stays mixed all the way to the pump. Watch how it circulates the product:
Frequently asked questions
What pump should I use to dispense CoolTherm EP-3500?
For a two-component potting material we start with a PDP two-component progressive cavity metering pump fed by a Material Feeding System (MFS) that agitates and recirculates both sides, with heat and vacuum degassing when the material calls for it. Pump size depends on your shot or bead size and cycle time; send us those and we will size it.
Can CoolTherm EP-3500 be fed from pails or drums?
Yes. For production volumes we feed it from bulk containers through a Material Feeding System (MFS), which agitates and recirculates the material so the filler stays in suspension, and degasses it under vacuum.
How do you keep CoolTherm EP-3500 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 CoolTherm EP-3500 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 CoolTherm EP-3500, 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
- CoolTherm EP-2000 · Parker LORD, thermal potting / encapsulant
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- DOWSIL TC-6015 Thermal Conductive Encapsulant · Dow, thermal potting
- SilCool TIA216G · Momentive, thermal potting
- SilCool TIA211G · Momentive, thermal potting
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CoolTherm EP-3500 is a trademark of Parker LORD or its affiliates. Dispense Robotics is not affiliated with the manufacturer; the name is used to describe the material our equipment dispenses.