Low-viscosity PCTFE inert oil. An instrument fill fluid and mechanical seal barrier fluid, as well as a single-phase immersion cooling / heat transfer fluid for electronics. A cost-effective replacement for Solvay Galden HT230 — no flash point (nonflammable), compatible with reactive media such as oxygen and chlorine. Korea stock available, ready to ship.
Per HQ data. Product number 4.2 = kinematic viscosity (cSt) at 37.8°C (100°F).
| Viscosity @ 37.8°C (100°F) | 4.2 cSt |
| Viscosity @ 71.1°C (160°F) | 1.9 cSt |
| Viscosity @ 98.9°C (210°F) | 1.2 cSt |
| Density @ 37.8°C | 1.85 g/mL |
| Pour point | -73°C (-100°F) |
| Cloud point | < -87°C |
| Dielectric constant | 2.8 ~ 3.0 |
| Flash point / Fire point | None (nonflammable) |
| Service temperature range | -70 ~ +200°C |
| Max. safe operating temperature | 204°C (260°C short-term, clean system) |
| Appearance | Colorless clear liquid (Water White) |
| Chemical family | PCTFE |
※ Detailed cooling-design properties such as thermal conductivity, boiling point and dielectric strength (kV/mm) are provided from the latest HQ datasheet — inquire below.
Per HQ data, 4.2 Oil is comparable to Galden HT230 in vapor pressure and viscosity, and while it holds similar thermal conductivity and boiling point, its dielectric strength and dielectric constant are superior to Galden. It is a cost-effective alternative amid recent price increases for dielectric fluids.
Its low viscosity (4.2 cSt) means low circulation resistance for fast heat-transfer and cooling cycles, and a dielectric constant of 2.8–3.0 insulates electronic components to reduce the risk of short circuits. Long-term thermal stability to 204°C gives the fluid a long service life even in high-heat environments.
Halocarbon 4.2 and 6.3 are the fluids HQ presents with properties optimized for single-phase immersion cooling. For two-phase (evaporative) immersion cooling, HFMOP is the fit.
4.2 is in the low-viscosity line. If you need an ultra-low viscosity with faster circulation and cooling cycles, consider 0.8; if you need more boiling margin and film stability, consider 6.3.
| Grade | Viscosity (cSt @37.8°C) | Pour point | Typical applications |
|---|---|---|---|
| 0.8 | 0.8 | -129°C | Cryogenic calibration bath · refrigeration |
| 4.2 | 4.2 | -73°C | Single-phase immersion cooling · instrument fill · seal (Galden HT230) |
| 6.3 | 6.3 | -71°C | Single-phase immersion cooling · seal (Galden HT230) |
| 27 | 27 | -40°C | Compressor · hydraulic fluid · vapor phase soldering |
| 56 | 56 | -34°C | Compressor · general bearings |
| 95 | 95 | -26°C | Instrument fill · general-purpose inert lubrication |
| 200 ~ 1000N | 200 ~ 1000 | -12 ~ +10°C | Medium to maximum-load bearings & gearboxes |
For immersion-cooling / heat-transfer applications, tell us your system conditions (heat load, flow rate, target temperature, materials); for fill / seal applications, tell us the equipment model, and we will reply within 24 business hours with the optimal grade and a quote. Genuine HQ product supplied direct, with batch traceability.
