BERGQUIST LIQUI FORM TLF LF3500 (Liqui-Form 3500) is a silicone 1K thermal gel from Henkel Bergquist, rated 3.5 W/m·K. Typical uses: Handheld devices; bare die to lid; gaps to heat sinks; low assembly pressure; reworkable assemblies; BGA/PGA/PPGA. Short answer: we dispense it with a PCP progressive cavity pump.
Material at a glance
| Manufacturer | Henkel Bergquist |
|---|---|
| Type | 1K thermal gel |
| Chemistry | Silicone |
| Thermal conductivity | 3.5 W/m·K |
| Cure | non-curing (pre-cured) |
| Packages | Cartridges 30 cc, 150 cc, 300 cc, 600 cc; 4.3 gal pail |
From the manufacturer's published data (source). Always work from the current technical data sheet.
How we dispense it
For a single-component thermal gel 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.
- Feed: thick pastes don't flow to a pump on their own. Above cartridge volumes, a follower plate pushes the material out of the pail and keeps air out.
- Non-curing: there's nothing to purge, so the job is accurate, repeatable metering.
See our PCP progressive cavity pumps, or use the pump configurator.
Frequently asked questions
What pump should I use to dispense BERGQUIST LIQUI FORM TLF LF3500 (Liqui-Form 3500)?
For a single-component thermal gel 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 BERGQUIST LIQUI FORM TLF LF3500 (Liqui-Form 3500) be fed from pails instead of cartridges?
Henkel Bergquist lists these packages: Cartridges 30 cc, 150 cc, 300 cc, 600 cc; 4.3 gal pail. 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 BERGQUIST LIQUI FORM TLF LF3500 (Liqui-Form 3500) 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 BERGQUIST LIQUI FORM TLF LF3500 (Liqui-Form 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 BERGQUIST LIQUI FORM TLF LF3500 (Liqui-Form 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
- BERGQUIST LIQUI FORM TLF LF2000 (Liqui-Form 2000) · Henkel Bergquist, 1K thermal gel
- BERGQUIST LIQUI FORM TLF 6000HG · Henkel Bergquist, 1K thermal gel
- BERGQUIST LIQUI FORM TLF 10000 · Henkel Bergquist, 1K thermal gel
- THERM-A-GAP GEL 8010 · Parker Chomerics, 1K thermal gel
- THERM-A-GAP GEL 37 · Parker Chomerics, 1K thermal gel
- THERM-A-GAP GEL 45 · Parker Chomerics, 1K thermal gel
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BERGQUIST LIQUI FORM TLF LF3500 (Liqui-Form 3500) is a trademark of Henkel Bergquist or its affiliates. Dispense Robotics is not affiliated with the manufacturer; the name is used to describe the material our equipment dispenses.