Galden HT 230

What is Galden HT 230?

Galden HT 230 is a heat transfer fluid with an exceptionally high boiling point of 230°C. Galden HT 230 is outstanding chemical stability makes it highly suitable for use in semiconductor manufacturing, chemical processing, pharmaceutical production, and various other industrial applications.

Key Features of Galden® HT 230

Galden® HT 230 is a high-boiling perfluoropolyether (PFPE) heat-transfer fluid developed for elevated-temperature systems requiring low volatility, electrical insulation, chemical inertness and non-flammability. It has a nominal boiling point of 230°C.

Galden® PFPE fluids have a typical dielectric strength of 40 kV at a 2.54 mm gap, volume resistivity of approximately 1.5 × 10¹⁵ Ω·cm, and no flash, fire or auto-ignition point.

Key Typical Properties

• Boiling point: 230°C

• Density at 25°C: approximately 1.82 g/cm³

• Kinematic viscosity at 25°C: approximately 4.4 cSt

• Pour point: approximately −77°C

• Dielectric strength: approximately 40 kV at a 2.54 mm gap

HT 230 offers lower volatility and higher temperature capability than HT 200, while maintaining lower viscosity and better low-temperature pumpability than HT 270. It is therefore a balanced high-boiling grade for systems that require strong evaporation control without using the most viscous fluid in the Galden® HT range.

Technical data sheet of Galden HT 230

Physical

Thermal

Electrical

Optical

Galden® HT Series Comparison

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

Applications of Galden® HT 230

Galden® HT 230 is a high-boiling PFPE heat-transfer fluid with a nominal boiling point of 230°C. Its combination of low volatility, dielectric performance, chemical inertness and non-flammability makes it particularly suitable for elevated-temperature thermal-management systems.

1. Semiconductor Manufacturing Equipment

Galden® HT 230 can be used in high-temperature heat-transfer circuits serving semiconductor fabrication equipment, including dry etching, chemical vapor deposition and physical vapor deposition systems.

Compared with lower-boiling Galden® HT grades, its low vapor pressure helps reduce evaporation losses in demanding process environments. Its dielectric and chemically inert properties also support reliable temperature control near sensitive electronic equipment and aggressive process chemicals.

2. High-Temperature Recirculating Chillers

HT 230 is suitable for specialized recirculating chillers and temperature-control units operating at elevated temperatures.

Its boiling point of 230°C and vapor pressure of approximately 0.03 torr at 25°C provide substantially better fluid retention than lower-boiling grades. This can reduce fluid consumption, maintenance requirements and operating costs in properly sealed systems.

3. Chemical Process Temperature Control

Galden® HT 230 can serve as a heat-transfer medium in jacketed reactors, process vessels and other chemical-processing equipment exposed to aggressive operating conditions.

Its PFPE structure provides strong chemical, thermal and oxidative stability. This helps minimize reactions with process materials, corrosion of construction materials and residue formation under recommended operating conditions.

4. Pharmaceutical Process Equipment

HT 230 may be considered for closed-loop thermal-control systems used with pharmaceutical reactors, synthesis equipment and other high-temperature processing units.

Its non-flammability, chemical inertness and low residue formation are particularly useful where process safety, cleanliness and consistent temperature control are important. Suitability must still be verified against the specific equipment, seals and applicable manufacturing requirements.

5. Vapor-Phase Heating Systems

The defined 230°C boiling point of Galden® HT 230 allows it to generate a controlled-temperature vapor zone in appropriately designed vapor-phase heating equipment.

Heat is transferred through vapor condensation, providing uniform and self-limiting heating near the fluid’s boiling temperature. HT 230 is intended as an HT heat-transfer grade; Galden® LS/HS products are the grades specifically optimized and specified for vapor-phase soldering.

Frequently Asked Questions About Galden® HT 230

1. What is Galden® HT 230 used for?

Galden® HT 230 is primarily used in elevated-temperature heat-transfer systems, including semiconductor equipment, high-temperature recirculating chillers, chemical and pharmaceutical processing, vapor-phase heating and specialized electrical-cooling systems.

It is particularly useful when conventional fluids present limitations involving flammability, chemical reactivity, evaporation or electrical conductivity.

2. What is the operating-temperature range of Galden® HT 230?

Galden® HT 230 has a nominal boiling point of 230°C and a typical pour point of approximately −77°C.

Syensqo’s general guideline sets the upper operating temperature for an unpressurized single-phase system approximately 10°C below the fluid’s boiling point. This suggests an upper limit of about 220°C for HT 230 in that type of system.

The practical lower limit is not determined by pour point alone. It depends on viscosity, pump capacity, flow rate and allowable pressure drop.

3. How does Galden® HT 230 differ from HT 200 and HT 270?

HT 230 provides an intermediate balance between the lower viscosity of HT 200 and the greater temperature capability and lower volatility of HT 270.

Choose HT 200 when lower viscosity and easier pumping are more important. Choose HT 230 for higher-temperature capability and lower evaporation without the much higher viscosity of HT 270. Choose HT 270 when maximum boiling point and minimum ambient-temperature volatility are the principal priorities.

4. Is Galden® HT 230 electrically insulating and non-flammable?

Yes. Galden® HT fluids are dielectric and have a typical dielectric strength of approximately 40 kV across a 2.54 mm gap.

They are also non-flammable and have no flash point, fire point or auto-ignition point under standard test conditions. These characteristics support thermal management near electrical and electronic equipment while reducing the fire hazards associated with combustible heat-transfer liquids.

5. Is Galden® HT 230 the same as Galden® LS 230?

No. Although both products are associated with a temperature of approximately 230°C, they are optimized for different purposes.

Galden® HT 230 is a general high-temperature heat-transfer fluid. Galden® LS 230 belongs to the LS/HS family specifically designed for vapor-phase soldering, where narrow molecular-weight distribution, controlled distillation range and precise vapor temperature are critical.

For PCB soldering, the appropriate Galden® LS/HS grade should be selected rather than assuming that HT 230 is interchangeable with LS 230.

Key Differences Across the Galden® HT Series

All standard Galden® HT grades share PFPE characteristics such as chemical inertness, dielectric performance, non-flammability and resistance to residue formation. Their principal differences are boiling point, vapor pressure, viscosity, pour point and practical operating-temperature range.

• HT 55–HT 80: Very low viscosity and strong low-temperature circulation, but relatively high vapor pressure.

• HT 110–HT 135: Balance moderate-temperature capability with lower volatility.

• HT 170–HT 200: High-boiling grades offering reduced evaporation at elevated temperatures.

• HT 230: Balanced high-temperature grade with very low vapor pressure and moderate viscosity.

• HT 270: Highest-boiling standard grade with the lowest volatility, but significantly higher viscosity.

For HT 230, the most important selection advantage is its position between HT 200 and HT 270: it provides greater temperature capability and lower evaporation than HT 200 while remaining substantially easier to circulate at ambient and lower temperatures than HT 270.

Published values are typical data at 25°C unless otherwise stated and are not guaranteed specifications. The latest Technical Data Sheet, Safety Data Sheet and actual system conditions should be reviewed before final fluid selection.