QSil 553 thermally conductive encapsulant is a 2K thermal potting compound from ACC Silicones. Short answer: we dispense it with PDPBM-1000 (WC rotor, FFKM stator).
Recommended: PDPBM-1000 (WC rotor, FFKM stator), fed from a 650 cc cartridge.
Material at a glance
| Manufacturer | ACC Silicones |
|---|---|
| Type | 2K thermal potting compound |
| Viscosity | A 5,000 / B 3,500 mPa·s |
From Dispense Robotics test records and the manufacturer's published data. Always work from the current technical data sheet.
How we dispense it
We have run QSil 553 thermally conductive encapsulant on Dispense Robotics equipment. Our recommendation is PDPBM-1000 (WC rotor, FFKM stator), fed from a 650 cc cartridge. Pump size still depends on your shot or bead size and cycle time, so send us those and we'll confirm.
- 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 QSil 553 thermally conductive encapsulant?
We have run QSil 553 thermally conductive encapsulant on Dispense Robotics equipment. Pump size depends on your shot or bead size and cycle time; send us those and we will size it.
Can QSil 553 thermally conductive encapsulant 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.
How do you keep QSil 553 thermally conductive encapsulant 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 QSil 553 thermally conductive encapsulant 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 QSil 553 thermally conductive encapsulant, 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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- SilCool TIA216G · Momentive, thermal potting
- SilCool TIA211G · Momentive, thermal potting
All thermal interface materials · Materials we've dispensed
QSil 553 thermally conductive encapsulant is a trademark of ACC Silicones or its affiliates. Dispense Robotics is not affiliated with the manufacturer; the name is used to describe the material our equipment dispenses.