Galden® LS 230 - Vapor Phase Soldering Fluid

What Is Galden® LS 230?

Galden® LS 230 is a fully fluorinated perfluoropolyether fluid specifically engineered for Vapor Phase Soldering, also known as condensation soldering. Its narrow molecular-weight distribution and controlled vapor behavior help maintain a stable soldering temperature during repeated production cycles.

Galden® LS 230 is primarily selected for lead-free soldering processes whose validated reflow profile is compatible with a 230°C vapor environment. It should not be confused with Galden® HT 230: although both products have a nominal temperature of 230°C, LS 230 is specifically controlled for Vapor Phase Soldering, whereas HT 230 is a general heat-transfer fluid.

Key Features and Process Benefits

These features are identified in Syensqo’s current Galden® product information and in the Galden® LS/HS technical bulletin, which highlights process repeatability, absence of boiling-point drift, residue-free drying, inert-atmosphere heating and enhanced high-temperature safety.

Technical Properties

The following values are typical properties at 25°C unless otherwise specified. They are intended for grade comparison and preliminary process evaluation, not as guaranteed acceptance specifications.

Important: The published room-temperature vapor pressure is 3.4 Pa, not 3.4 torr. Temperature Reflux Vapor, or TRV, and distillation range should also be checked in the current product specification because these parameters are critical for LS/HS Vapor Phase Soldering fluids.

Galden® LS/HS Series Comparison

The principal difference among Galden® LS and HS grades is their controlled vapor temperature. Grade selection should be based primarily on the solder alloy, solder-paste reflow window, component-temperature limits and VPS machine design.

The comparison values come from the Galden® LS/HS Vapor Phase Soldering technical bulletin.

LS 230 Compared with LS 215

Galden® LS 230 provides a vapor temperature approximately 15°C higher than LS 215. It offers more thermal margin for solder pastes that cannot complete reflow in a 215°C vapor environment, but it also exposes the assembly to a higher maximum process temperature.

LS 230 Compared with HS 240

Galden® LS 230 limits the saturated vapor temperature to approximately 230°C, while HS 240 provides a 240°C vapor zone. HS 240 may be appropriate when additional process margin is required, but LS 230 may reduce thermal stress on temperature-sensitive components, connectors and PCB laminates.

LS 230 Compared with HT 230

Galden® LS 230 and HT 230 are not automatically interchangeable. LS 230 is controlled for narrow molecular-weight distribution, distillation range and Temperature Reflux Vapor. Galden® HT 230 is formulated primarily as a circulating heat-transfer fluid and uses different product-control parameters.

Common Applications

1. Lead-Free SMT Vapor Phase Reflow

Galden® LS 230 is primarily used as the working fluid in VPS equipment processing lead-free printed circuit board assemblies. Its controlled 230°C vapor zone can support solder pastes whose approved peak-temperature and time-above-liquidus requirements fit within this thermal window.

2. Complex and Densely Populated PCB Assemblies

Condensation vapor can surround tall components, connectors, shielding structures and densely packed devices. This makes LS 230 particularly suitable for assemblies where directional hot-air flow may produce thermal shadowing or uneven heating.

Because the vapor condenses on surfaces that remain cooler than the vapor temperature, heat is distributed across exposed areas regardless of component orientation. This application benefit is an engineering consequence of the condensation-heating mechanism described by Syensqo.

3. Mixed-Thermal-Mass Assemblies

PCB assemblies may contain both lightweight surface-mount components and high-mass parts such as transformers, copper planes, power connectors or heat spreaders.

Uniform condensation heating helps reduce temperature differences between low- and high-thermal-mass areas. This can simplify profile development and support more consistent solder-joint formation across the assembly.

4. Power Electronics and High-Current Assemblies

Galden® LS 230 can be considered for compatible power-electronics assemblies containing heavy copper boards, power semiconductors, large terminals and thermally demanding substrates.

The uniform heating mechanism can be useful where large differences in component mass make conventional convection reflow difficult to balance. The completed reflow profile must still comply with the solder-paste, component and substrate suppliers’ thermal limits.

5. Prototype, NPI and High-Mix Production

VPS is well suited to prototype development, new-product introduction and high-mix manufacturing because the maximum vapor-zone temperature is determined primarily by the selected fluid.

Different compatible board layouts can often be processed without creating an entirely new set of convection-zone temperatures for each product. Machine parameters such as preheating, immersion time, board loading and cooling must still be qualified for every assembly.

6. EMS and OEM Lead-Free Production

Galden® LS 230 can be used in Electronics Manufacturing Services and original-equipment-manufacturer production environments that require repeatable processing of compatible lead-free PCBAs.

Its narrow molecular-weight distribution and controlled vapor temperature help maintain stable process conditions across repeated production cycles.

Frequently Asked Questions About Galden® LS 230

1. What is Galden® LS 230 used for?

Galden® LS 230 is used as a PFPE working fluid in Vapor Phase Soldering machines operating at a controlled vapor temperature of approximately 230°C. Its main application is lead-free reflow soldering of compatible printed circuit board assemblies.

2. Is Galden® LS 230 suitable for lead-free soldering?

Yes. The Galden® LS/HS family is designed for lead-free VPS processing, with grades covering vapor temperatures up to 260°C. LS 230 should be used only when the selected solder paste can achieve its required liquidus time and peak profile within a 230°C vapor environment.

3. How does Galden® LS 230 prevent overheating?

The saturated vapor has a defined temperature of approximately 230°C at the specified operating pressure. Vapor condenses only on surfaces cooler than the vapor, so heat transfer decreases as the assembly approaches that temperature.

This creates a naturally limited heating environment and reduces uncontrolled temperature overshoot. It does not eliminate the need to control dwell time, preheating, board loading and cooling.

4. What is the difference between Galden® LS 230 and HS 240?

LS 230 produces an approximately 230°C vapor zone, while HS 240 produces an approximately 240°C vapor zone. LS 230 generally limits assembly exposure to a lower peak temperature, whereas HS 240 provides greater thermal margin for soldering processes that cannot be completed reliably at 230°C.

5. Can Galden® LS 230 be mixed with another LS or HS grade?

Routine mixing is not recommended without technical evaluation. Although LS and HS grades share PFPE chemistry, mixing changes the molecular-weight distribution, vapor-temperature profile and distillation range.

The resulting fluid may no longer provide the precise TRV and repeatability specified for either original grade. This is an engineering inference based on Syensqo’s requirement to control molecular-weight distribution, TRV and distillation range for VPS fluids.

6. Does Galden® LS 230 leave residue or cause corrosion?

Under recommended operating conditions, Galden® LS/HS fluids provide good material compatibility and do not normally form decomposition residues. The LS/HS technical bulletin also identifies no corrosion or reaction with compatible construction materials as a process benefit.

Abnormal overheating must be prevented. Syensqo states that significant PFPE thermal degradation begins around 290–300°C, well above the nominal LS 230 vapor temperature but potentially reachable during heater or electrical failures.

7. Is Galden® LS 230 flammable?

No. Galden® PFPE fluids have no flash point, fire point or auto-ignition point under standard test conditions. This provides an important process-safety advantage in high-temperature soldering equipment.

8. How long can Galden® LS 230 be stored?

Syensqo states that Galden® PFPE fluids remain chemically stable for more than 20 years when stored in their original sealed containers. Containers should remain closed, correctly labeled and protected from contamination.