SikaBiresin TC-455 is a non-silicone (stp) 2K gap filler from Sika, rated 2.2 W/m·K. Typical uses: Module-to-cooling-plate gap filler, EV battery; low adhesion for disassembly. Short answer: we dispense it with a PDP two-component progressive cavity metering pump with a static mixer.
Material at a glance
| Manufacturer | Sika |
|---|---|
| Type | 2K gap filler |
| Chemistry | Non-silicone (stp) |
| Thermal conductivity | 2.2 W/m·K |
| Mix ratio | 1:1 by volume |
| Viscosity | Part A 70 Pa·s; Part B 60 Pa·s; mixed 60 Pa·s |
| Cure | Room temperature (moisture-assisted); open time 60 min; properties after 7 d at 23°C/50% RH |
| Packages | 400 ml dual cartridge; 23 l pails; 180 l drums |
From the manufacturer's published data (source). Always work from the current technical data sheet.
How we dispense it
For a two-component gap filler 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.
- Dispense pattern: gap fillers are squeezed between the part and the housing, so the pattern (dots, lines or a star) decides coverage and whether air gets trapped.
- Moisture cure: keep the feed sealed from air, or the material skins in the lines.
See our PDP two-component metering pumps, or use the pump configurator.
Frequently asked questions
What pump should I use to dispense SikaBiresin TC-455?
For a two-component gap filler 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 SikaBiresin TC-455 be fed from pails instead of cartridges?
Sika lists these packages: 400 ml dual cartridge; 23 l pails; 180 l drums. 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 SikaBiresin TC-455 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 SikaBiresin TC-455 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 SikaBiresin TC-455, 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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SikaBiresin TC-455 is a trademark of Sika or its affiliates. Dispense Robotics is not affiliated with the manufacturer; the name is used to describe the material our equipment dispenses.