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Galden HT 70
4 5 (1 evaluate)Category: Galden® HT
Maker: Syensqo
Made in: Italy
Packaging: 1kg, 5kg
What is Galden HT 70?
Galden HT 70 is a heat transfer fluid in the Galden HT series from Syensqo. Its standout characteristic is its capability to function effectively in very low temperatures, making it perfect for cold environments, cooling systems, and applications that demand efficient heat transfer under low temperature and pressure conditions
Key Features of Galden HT 70
Galden® HT 70 is a low-boiling perfluoropolyether (PFPE) heat-transfer fluid designed for systems requiring low-temperature fluidity, electrical insulation, chemical inertness and non-flammability. Its nominal boiling point is 70°C.
| Feature | Customer Benefit |
|---|---|
| Controlled boiling point of 70°C | Supports precise thermal management and predictable evaporation–condensation cycles in properly engineered two-phase cooling systems. |
| Extremely low pour point below −110°C | Maintains fluidity during cold starts and supports reliable circulation in very low-temperature equipment. |
| Very low viscosity: 0.50 cSt at 25°C | Reduces flow resistance and enables efficient circulation through compact piping, narrow channels and heat exchangers. |
| Good heat-transfer performance | Provides stable and consistent temperature control for semiconductor tools, electronics and precision industrial equipment. |
| Excellent dielectric strength | Typical dielectric strength of approximately 40 kV across a 2.54 mm gap supports heat transfer near sensitive electrical and electronic components. |
| High chemical and thermal stability | Helps prevent reactions with system materials, fluid degradation and corrosion under demanding operating conditions. |
| Non-flammable PFPE fluid | Has no flash point, fire point or auto-ignition point, reducing fire and explosion risks compared with combustible heat-transfer fluids. |
| Low residue formation | Does not normally form decomposition or carbonaceous residues under recommended operating conditions, helping keep systems clean and reliable. |
| Compatibility with common engineering materials | Can be used with many metals, plastics and elastomers, providing flexibility in the selection of pumps, pipes, seals and heat exchangers. |
| Low water solubility | Helps preserve fluid purity and dielectric performance by minimizing moisture absorption. |
Galden® HT 70 is particularly suitable for low-temperature recirculating chillers, semiconductor process equipment, electronic thermal-management systems and two-phase cooling applications designed around a 70°C boiling point.
Technical data sheet of Galden HT 70
Physical
|
Property |
Typical Value |
Unit |
|---|---|---|
|
Average Molecular Weight |
410 |
amu |
|
Density (25°C) |
1.68 |
g/cm³ |
|
Kinematic Viscosity |
0.500 |
cSt |
|
Solubility |
|
|
|
of air |
26.0 |
ml gas/100 ml liquid |
|
of water |
< 10.0 |
wppm |
|
Surface Tension (25°C) |
14 |
dyne/cm |
|
Vapor Pressure (25°C) |
141 |
sec/100cc |
Thermal
|
Property |
Typical Value |
Unit |
|---|---|---|
|
Thermal Conductivity (25°C) |
0.065 |
W/m/K |
|
Boiling Point |
70 |
°C |
|
Heat of Vaporization - at Boiling Point |
17.0 |
cal/g |
|
Pour Point |
-110 |
°C |
|
Specific Heat Capacity (25°C) |
0.23 |
cal/g/°C |
Electrical
|
Property |
Typical Value |
Unit |
|---|---|---|
|
Volume Resistivity (25°C) |
1.0E+15 |
ohms·cm |
|
Dielectric Constant (25°C) |
1.86 |
|
|
Dielectric Strength - 2.54 mm gap (25°C) |
40 |
kV |
|
Dissipation Factor - 1 kHz |
2.0E-4 |
|
Optical
|
Property |
Typical Value |
Unit |
Test Method |
|---|---|---|---|
|
Refractive Index |
1.28 |
|
ASTM D542 |
Galden® HT Series Comparison
| Grade | Boiling Point (°C) | Density @ 25°C (g/cm³) | Vapor Pressure @ 25°C (torr) | Viscosity @ 25°C (cSt) | Dielectric Strength | Chemical Stability | Flammability | Residue |
|---|---|---|---|---|---|---|---|---|
| Galden® HT 55 | 55 | 1.65 | 225 | 0.45 | 40 kV | Chemically inert | Non-flammable | No decomposition residue |
| Galden® HT 70 | 70 | 1.68 | 141 | 0.50 | 40 kV | Chemically inert | Non-flammable | No decomposition residue |
| Galden® HT 80 | 80 | 1.69 | 105 | 0.57 | 40 kV | Chemically inert | Non-flammable | No decomposition residue |
| Galden® HT 110 | 110 | 1.71 | 17 | 0.77 | 40 kV | Chemically inert | Non-flammable | No decomposition residue |
| Galden® HT 135 | 135 | 1.72 | 5.8 | 1.00 | 40 kV | Chemically inert | Non-flammable | No decomposition residue |
| Galden® HT 170 | 170 | 1.77 | 0.8 | 1.80 | 40 kV | Chemically inert | Non-flammable | No decomposition residue |
| Galden® HT 200 | 200 | 1.79 | 0.2 | 2.40 | 40 kV | Chemically inert | Non-flammable | No decomposition residue |
| Galden® HT 230 | 230 | 1.82 | 0.03 | 4.40 | 40 kV | Chemically inert | Non-flammable | No decomposition residue |
| Galden® HT 270 | 270 | 1.85 | <0.01 | 14.00 | 40 kV | Chemically inert | Non-flammable | No decomposition residue |
Notes: Dielectric strength is approximately 40 kV at a 2.54 mm electrode gap. Galden® HT fluids have no flash point, fire point or auto-ignition point under standard test conditions. Values shown are typical data and should not be considered guaranteed specifications.
Additional Information
|
Property |
Typical Value |
Unit |
|---|---|---|
|
Coefficient of thermal expansion |
0.0011 |
cm³/cm³°C |
Applications of Galden HT 70
Galden® HT 70 is a low-boiling, dielectric PFPE heat-transfer fluid with a nominal boiling point of 70°C, kinematic viscosity of approximately 0.50 cSt at 25°C and a pour point below −110°C. These characteristics make it particularly relevant to low-temperature circulation and electronic cooling systems.
1. Semiconductor Process Chillers
Galden® HT 70 is commonly used as a circulating heat-transfer medium in temperature-control units serving semiconductor fabrication equipment.
Typical processes include:
- Plasma dry etching
- Chemical and plasma-enhanced vapor deposition
- Physical vapor deposition
- Ion implantation
- Wafer-temperature control
Its low viscosity supports circulation through small channels, while its dielectric and chemically inert properties help reduce electrical, contamination and chemical-reaction risks. Syensqo identifies Galden® HT fluids as widely used in dry etching, CVD and PVD processes.
2. Low-Temperature Recirculating Chillers
Galden® HT 70 is suitable for recirculating chillers and temperature-control units used with analytical instruments, electronics-production systems and precision industrial equipment.
Its very low pour point helps maintain circulation during cold operation, while its 70°C boiling point provides a higher upper-temperature margin and lower volatility than Galden® HT 55. In an unpressurized single-phase system, Syensqo recommends keeping the maximum fluid temperature approximately 10°C below the boiling point. For HT 70, this corresponds to approximately 60°C.
3. Single-Phase Server and Electronics Immersion Cooling
Galden® HT 70 can be used for direct-contact, single-phase immersion cooling of compatible server blades, computing boards and other high-heat-density electronics.
The electronic assembly is immersed in the dielectric liquid, and the heated fluid is circulated to an external heat exchanger without intentionally boiling. Its low dielectric constant, electrical resistivity and non-flammability support cooling near energized components. Industry application guidance specifically identifies HT 55 and HT 70 for server-blade immersion cooling, depending on the device temperature requirements.
4. Two-Phase Immersion Cooling
Galden® HT 70 may also be used in properly engineered two-phase immersion systems designed around its approximately 70°C boiling point.
Heat from electronic components causes the liquid to boil. The vapor rises to a condenser, releases heat and returns to the bath as liquid. Two-phase cooling can manage high heat fluxes, but it requires effective vapor containment, condensation capacity, pressure control and fluid recovery. HT 70 provides a higher boiling temperature and lower vapor pressure than HT 55, making it suitable for components designed to operate at somewhat higher temperatures.
5. Transformer, Power-Electronics and High-Performance Computing Cooling
Galden® HT fluids are used for transformer, power-supply, supercomputer and other electrical-cooling applications requiring both heat removal and electrical insulation.
Galden® HT 70 is most relevant when the equipment operates within its low-to-medium temperature window. Its typical dielectric strength is approximately 40 kV across a 2.54 mm gap, while its PFPE chemistry provides non-flammability and chemical stability.
Frequently Asked Questions About Galden HT 70
1. What is Galden® HT 70 used for?
Galden® HT 70 is primarily used as a dielectric heat-transfer fluid in semiconductor chillers, recirculating thermal-control units, electronic immersion-cooling systems, transformers and high-performance computing equipment.
It is selected when low viscosity, low-temperature fluidity, electrical insulation and non-flammability are required.
2. What is the operating-temperature range of Galden® HT 70?
Galden® HT 70 has a nominal boiling point of 70°C and a pour point below −110°C. However, the pour point is not the same as the practical lower operating limit.
The lower limit is normally determined by fluid viscosity, pump capability and system pressure drop. The upper limit for an unpressurized single-phase system should generally be approximately 10°C below the boiling point, or around 60°C for HT 70.
3. Can Galden® HT 70 be used for immersion cooling?
Yes. Galden® HT 70 can be considered for both single-phase and two-phase immersion cooling.
In single-phase cooling, the fluid remains liquid and is pumped through a heat exchanger. In two-phase cooling, the fluid boils at approximately 70°C and removes heat through evaporation and condensation. The correct method depends on component-temperature limits, heat load, condenser design and vapor-control requirements.
4. Is Galden® HT 70 non-flammable and electrically insulating?
Yes. Galden® PFPE fluids have no flash point, fire point or auto-ignition point under standard test conditions. They also provide strong electrical insulation, with a typical dielectric strength of approximately 40 kV at a 2.54 mm gap.
These properties make HT 70 suitable for thermal-management systems located near energized or electrically sensitive components.
5. Can Galden® HT 70 replace 3M™ Novec™ 7100 or Fluorinert™ fluids?
Galden® HT 70 is frequently evaluated as a heat-transfer replacement for fluids such as 3M™ HFE-7100, HFE-7200 and FC-84 because it occupies a similar low-boiling thermal-management category.
However, it is not a drop-in replacement based on boiling point alone. Engineers must compare vapor pressure, density, viscosity, latent heat, material compatibility, pump performance, seals and system pressure. Current industry replacement guidance associates HFE-7100, HFE-7200 and FC-84 heat-transfer applications with Galden® HT 70.
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