GALDEN® HT 135

Econtrol Devices offers GALDEN® HT 135, a perfluoropolyether (PFPE) dielectric heat transfer fluid from the GALDEN HT range by Solvay/Syensqo.

GALDEN HT 135 is an inert, nonflammable liquid developed for industrial heat transfer applications. The fluid combines dielectric properties, chemical resistance, high heat resistance, and a boiling point of 135°C.

According to the manufacturer's Technical Data Sheet, the GALDEN HT range includes fluids with boiling points from 55°C to 270°C. The manufacturer states that this range enables PFPE fluids to be used at end-use temperatures up to 290°C, subject to the requirements of the specific application.

GALDEN HT 135 is listed for applications involving semiconductor manufacturing, chemical processing, pharmaceutical operations, vapor phase heating, transformer and supercomputer cooling, and recirculating chillers.

Key Features of GALDEN HT 135

• PFPE Heat Transfer Fluid: Part of the GALDEN HT perfluoropolyether range.

• Dielectric Properties: Designed for industrial heat transfer applications involving electrical equipment.

• Boiling Point: 135°C.

• Nonflammable: Confirmed in the manufacturer's Safety Data Sheet.

• Chemically Resistant: Listed as a product feature in the Technical Data Sheet.

• High Heat Resistance: Identified as a feature of the GALDEN HT range.

• High Density: 1.72 g/cm³.

• Kinematic Viscosity: 1.00 cSt.

• Thermal Conductivity: 0.065 W/m·°C.

• Specific Heat Capacity: 0.23 cal/g·°C at 25°C.

• Dielectric Strength: 40 kV at a 2.54 mm gap.

• Low Water Solubility: Less than 10 wppm.

• Colorless and Odorless: Confirmed in the manufacturer's Safety Data Sheet.

• Industrial Use: Identified as a heat transfer medium for industrial applications.

Applications of GALDEN HT 135

The manufacturer's Technical Data Sheet identifies GALDEN HT 135 for the following industrial application categories.

1. Semiconductor Manufacturing

GALDEN HT 135 is listed for heat transfer applications in the semiconductor industry.

Its dielectric characteristics and thermal properties are documented in the manufacturer's technical information.

2. Chemical Industry

The manufacturer identifies the chemical industry among the application areas for GALDEN HT 135.

3. Pharmaceutical Industry

GALDEN HT 135 is included in the manufacturer's list of heat transfer fluids for pharmaceutical industry applications.

The suitability of the fluid for a particular pharmaceutical process must be determined according to the manufacturer's instructions and applicable requirements.

4. Vapor Phase Heating

The manufacturer's Technical Data Sheet lists vapor phase heating among the intended applications of GALDEN HT fluids.

5. Transformer and Supercomputer Cooling

GALDEN HT 135 is identified for transformer and supercomputer cooling applications.

6. Recirculating Chillers

The product is listed for industrial heat transfer applications involving recirculating chillers.

7. Nuclear Industry

The manufacturer's Technical Data Sheet also includes nuclear industry applications.

Specific suitability and operating requirements must be evaluated for the intended system.

Technical Specifications of GALDEN HT 135

The following values are taken from the manufacturer's GALDEN HT135 Technical Data Sheet.

The manufacturer identifies these figures as typical properties, measured at 25°C unless otherwise stated. They are not guaranteed product specifications.

Chemical Composition

According to the manufacturer's Safety Data Sheet (Version 4.00, January 15, 2026), GALDEN HT 135 is a perfluorinated polyether substance.

The Safety Data Sheet identifies the product as a substance rather than a mixture.

The manufacturer states that the specific chemical identity and/or exact concentration percentage has been withheld as a trade secret.

Heat Transfer Performance

Thermal Properties

The manufacturer's Technical Data Sheet reports the following properties:

• Boiling Point: 135°C

• Pour Point: -100°C

• Heat of Vaporization: 16.0 cal/g

• Specific Heat Capacity: 0.23 cal/g·°C

• Thermal Conductivity: 0.065 W/m·°C

• Coefficient of Expansion: 0.0011 cm³/cm³·°C

These values describe the reported thermal characteristics of GALDEN HT 135.

Chemical and Thermal Resistance

The manufacturer identifies chemical resistance and high heat resistance as key product features.

The Safety Data Sheet states that the fluid is stable under recommended storage conditions and that no dangerous reactions are known under normal conditions of use.

Temperature Considerations

The GALDEN HT product range covers boiling points from 55°C to 270°C.

For GALDEN HT 135 specifically, the manufacturer reports a boiling point of 135°C and a pour point of -100°C.

The manufacturer's Safety Data Sheet reports a decomposition temperature above 290°C. This does not establish 290°C as a recommended operating temperature for the HT 135 grade.

Electrical Properties

GALDEN HT 135 is identified as a dielectric heat transfer fluid.

The manufacturer's Technical Data Sheet provides the following electrical properties:

These are typical manufacturer-reported values.

Material Compatibility

The manufacturer's documents identify GALDEN HT 135 as chemically resistant and stable under recommended conditions.

Material Compatibility Considerations

The supplied Technical Data Sheet does not contain a detailed compatibility table for individual metals, plastics, or elastomers.

Therefore, compatibility with specific construction materials should be evaluated for the intended application.

Incompatible Materials

The Safety Data Sheet identifies the following incompatible materials:

• Alkali Metals

• Lewis Acids (Friedel-Crafts) above 100°C

• Aluminum and Magnesium in Powder Form above 200°C

The SDS also notes that metals can promote decomposition and lower the decomposition temperature under certain conditions.

Available Packaging Sizes

The supplied product screenshot lists the following packaging options:

Packaging availability should be confirmed when requesting a quotation.

Storage and Handling

GALDEN HT 135 is intended for industrial use only.

Storage Guidelines

The manufacturer's Safety Data Sheet recommends:

• Store in properly labeled containers.

• Keep away from heat and sources of ignition.

• Keep away from combustible materials.

• Keep away from incompatible substances.

• Use suitable plastic or glass containers.

Handling Precautions

• Ensure adequate ventilation.

• Use appropriate personal protective equipment.

• Avoid overheating to prevent thermal decomposition.

• Take measures to prevent electrostatic charge buildup.

• Ensure equipment is electrically grounded before transfer operations.

• Clean and dry piping circuits and equipment before use.

• Follow good industrial hygiene practices.

Safety Information

According to the manufacturer's Safety Data Sheet dated January 15, 2026, GALDEN HT 135 is not classified as hazardous under the OSHA Hazard Communication Standard (29 CFR 1910.1200).

The Safety Data Sheet also identifies the product as nonflammable and non-explosive.

High-Temperature Precautions

The Safety Data Sheet reports a decomposition temperature above 290°C.

When overheated or exposed to fire, the fluid may produce hazardous decomposition products, including:

• Gaseous Hydrogen Fluoride (HF)

• Fluorophosgene

Personal Protective Equipment

The manufacturer recommends:

• Chemical-resistant protective gloves

• Safety glasses with side shields

• Protective work clothing

• Appropriate respiratory protection when required

For operations where splashing is likely, the Safety Data Sheet recommends tightly fitting goggles and a chemical-resistant apron.

Environmental and Regulatory Information

Chemical Inventory Status

The manufacturer's Safety Data Sheet identifies GALDEN HT 135 on the following chemical inventories:

• United States TSCA Inventory

• Canadian Domestic Substances List

• Australian Inventory of Industrial Chemicals

• Korean Existing Chemicals Inventory

• China's Existing Chemical Substances Inventory

• Applicable Japanese Chemical Inventories

• Philippines Inventory of Chemicals and Chemical Substances

• New Zealand Chemical Substances Inventory

• Taiwan Chemical Substance Inventory

The Safety Data Sheet also identifies specific conditions concerning Japanese importation and European REACH compliance.

Environmental Precautions

The manufacturer states that GALDEN HT 135 should not be released into the environment.

The fluid should not enter drains, surface water, or soil.

No verified product-specific global warming potential or ozone depletion potential value is supplied in the attached documents.

Recycling and Disposal

The manufacturer's Safety Data Sheet provides the following disposal instructions.

Disposal Guidelines

• Do not dispose of the fluid into sewers, soil, or water bodies.

• Follow applicable local, regional, and national regulations.

• Incineration may be used where permitted by local regulations.

• Incineration equipment must include systems for neutralizing or recovering hydrogen fluoride.

• Empty containers may be landfilled where local regulations permit.

GALDEN HT 135 – Product Inquiries at Econtrol Devices

Econtrol Devices provides product information and quotation assistance for GALDEN® HT 135 Dielectric Heat Transfer Fluid.

For product specifications, packaging options, technical documentation, or quotations, contact Econtrol Devices.

Safety Information: GALDEN HT 135 is intended for industrial use only. Although it is not classified as hazardous under OSHA GHS, thermal decomposition can release hazardous gases. Review the manufacturer's current Technical Data Sheet, Safety Data Sheet, and product label before handling or using the fluid.