Galden HT Fluids

Galden® PFPE HT fluids are inert, dielectric, and high-performance heat transfer fluids with boiling points ranging from 55°C to 270°C. A line of 9 different dielectric fluids, their broad range of boiling points allows the most suitable fluid to be selected for a particular application. Galden HT was developed to meet the increasingly demanding and diversified needs of various industries ranging from semiconductor to nuclear and pharmaceutical.

Galden HT fluids have excellent thermal and chemical stability, giving them good compatibility with materials. Thus, Galden HT fluids will not corrode or react with construction materials, nor will residues form from decomposition, corrosion, or fluid degradation.

Galden Heat Transfer Fluids are perfluorinated compounds that provide effective heat transfer both in direct and indirect cooling applications. Their unique compatibility with sensitive components makes them particularly suitable for direct cooling applications. Direct immersion cooling provides for more effective heat removal and therefore helps to keep the components’ temperatures constant. As a result, the failure rate is lower and the package size can be minimized.

The low relative viscosity of Galden HT fluids and their wide operating temperature range permit them to act as heat transfer liquids in extreme conditions.

Galden® is a registered trademark of Solvay.

Physical and Chemical Properties

  • High oxidative and thermal resistance
  • Non-toxic and non-ozone depleting
  • No flash or fire point
  • Excellent dielectric properties


  • Low pour point and water solubility
  • Relatively low viscosity
  • Complete absence of hydrogen
  • Excellent compatibility with metals, plastics, and elastomers



Compatibility

    Metals

  • AISI 316
  • Copper
  • Brass
  • Iron
  • Nickel
  • Aluminum
  • Stainless steel
  • Bronze


    Plastics

  • PE low density
  • Polypropylene
  • Polycarbonate
  • ABS copolymer
  • Polyphenyloxide
  • PET
  • POM
  • PTFE
  • PVC
  • PMMA


    Elastomers

  • Butyl rubber
  • NBR
  • EPDM
  • Natural rubber
  • Silicone rubber
  • Fluorosilicone




    Electronic

  • Direct immersion
  • Etcher – PVD, CVD
  • Ion implanter
  • Radar

    Nuclear

  • UF6 production


    Electrical

  • Transformer
  • Power supplies

    Chemical

  • Aggressive conditions

    Pharmaceutical

  • Freeze dryer




The following properties are equal for all Galden Heat Transfer grades:

Typical PropertiesGalden HT
Specific Heat at 25ºC (cal/g*C)0.23
Thermal Conductivity at 25ºC (W/m*C)0.065
Coefficient of Expansion (cm3/cm3*C)0.0011
Dielectric Strength at 25ºC (KV, 2.54 mm gap)40
Dissipation Factor at 25ºC (1Khz)2x10-4
Solubility of Water (ppm, wt)14
Solubility of Air (cm3 gas, 100cm3 liquid)26

Typical PropertiesHT 55HT70HT80HT 110HT 135HT 170HT 200HT 230HT 270
Boiling Point (ºC)557080110135170200230270
Pour Point (ºC)<-115<-115<-110<-110<-100-97-85-77-66
Density at 25ºC (g/cm3) 1.651.681.691.711.721.771.791.821.85
Kinematic Viscosity at 25ºC (cSt)0.450.500.570.7711.82.44.411.7
Vapor Pressure at 25ºC (torr) 225141105175.80.80.20.0253x10-3
Heat of Vaporization at Boiling Point  (cal/g)221717171616151615
Surface Tension at 25ºC (dyne/cm)161416161718191920
Refractive Index at 25ºC1.281.281.281.281.281.281.2811.2831.283
Dielectric Constant at 25ºC (1 Khz)1.861.861.891.91.91.91.941.941.94
Volume Resistivity  (Ohm-cm)5x10125x10155x10155x10155x10155x10155x10155x10155x1015
Average Molecular Weight34041043058061076087010201550

Typical PropertiesHT90 (discontinued by manufacturer)
Boiling Point (ºC)90
Pour Point (ºC)<-110
Density at 25ºC (g/cm3)1.69
Kinematic Viscosity at 25ºC (cSt)0.75
Vapor Pressure at 25ºC (torr)48
Heat of Vaporization at Boiling Point  (cal/g)17
Surface Tension at 25ºC (dyne/cm)16
Refractive Index at 25ºC1.28
Dielectric Constant at 25ºC (1 Khz)1.9
Volume Resistivity  (Ohm-cm)5x1015
Average Molecular Weight460

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