NuSil CV-2946 is a silicone 2K thermal adhesive from NuSil, rated 1.49 W/m·K. Typical uses: Low-outgassing heat transfer to heat sinks; bonding IC substrates/base plates (space/aerospace). Short answer: we dispense it with a PDP two-component progressive cavity metering pump with a static mixer.
Material at a glance
| Manufacturer | NuSil |
|---|---|
| Type | 2K thermal adhesive |
| Chemistry | Silicone |
| Thermal conductivity | 1.49 W/m·K |
| Mix ratio | 15:1 (A:B) |
| Viscosity | 3,560,000 cP |
| Cure | Listed as 7 days RTV (work time 2 h); page also says heat-cure - verify |
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 NuSil CV-2946?
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 NuSil CV-2946 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 NuSil CV-2946 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 NuSil CV-2946 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 NuSil CV-2946, 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
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- CoolTherm UR-2000 · Parker LORD, 2K gap filler / thermal adhesive
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NuSil CV-2946 is a trademark of NuSil or its affiliates. Dispense Robotics is not affiliated with the manufacturer; the name is used to describe the material our equipment dispenses.