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 Properties	Galden 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 Properties	HT 55	HT70	HT80	HT 110	HT 135	HT 170	HT 200	HT 230	HT 270
Boiling Point (ºC)	55	70	80	110	135	170	200	230	270
Pour Point (ºC)	<-115	<-115	<-110	<-110	<-100	-97	-85	-77	-66
Density at 25ºC (g/cm3)	1.65	1.68	1.69	1.71	1.72	1.77	1.79	1.82	1.85
Kinematic Viscosity at 25ºC (cSt)	0.45	0.50	0.57	0.77	1	1.8	2.4	4.4	11.7
Vapor Pressure at 25ºC (torr)	225	141	105	17	5.8	0.8	0.2	0.025	3x10-3
Heat of Vaporization at Boiling Point (cal/g)	22	17	17	17	16	16	15	16	15
Surface Tension at 25ºC (dyne/cm)	16	14	16	16	17	18	19	19	20
Refractive Index at 25ºC	1.28	1.28	1.28	1.28	1.28	1.28	1.281	1.283	1.283
Dielectric Constant at 25ºC (1 Khz)	1.86	1.86	1.89	1.9	1.9	1.9	1.94	1.94	1.94
Volume Resistivity (Ohm-cm)	5x1012	5x1015	5x1015	5x1015	5x1015	5x1015	5x1015	5x1015	5x1015
Average Molecular Weight	340	410	430	580	610	760	870	1020	1550

Typical Properties	HT90 (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 25ºC	1.28
Dielectric Constant at 25ºC (1 Khz)	1.9
Volume Resistivity (Ohm-cm)	5x1015
Average Molecular Weight	460