Galden® HT PFPE Heat Transfer Fluids

Galden® HT PFPEs can be employed as Heat Transfer (HT) media for demanding conditions in a variety of fields and applications:

• Semiconductor

• Chemical

• Pharmaceutical

• Vapor phase heating

• Transformer and supercomputer cooling

• Recirculating chillers

• Nuclear

Galden® HT PFPEs are inert, dielectric and high-performance heat transfer fluids with boiling points ranging 55°C to 270°C.

This range is unique among the fluorinated fluids on the market and enables Galden® HT PFPEs to be employed at end-use temperatures ranging below -100°C up to 290°C.

Features and Benefits of Galden® HT PFPE

Features	Benefits
Excellent thermal and chemical stability	No corrosion or reaction with construction materials
Good compatibility with materials	No formation of decomposition residues No circulating pump seizure due to fluid degradation or corrosion
Good heat transfer performance	Good temperature control
Grades with a wide range of boiling point	Wide choice of grades to optimize performance
High boiling point with low pour point and low viscosity	High boiling grades reduce evaporation losses without affecting performance
Low evaporation losses	Low costs of ownership
No flash point No fire point No explosion hazards No auto-ignition point FM Approval 6930	Safe to use at high temperature No fire hazard Lower fire prevention costs

Galden® End-Use Temperature Segmentation

The broad selection of average molecular weights enables the use of Galden® Heat Transfer Fluids across the range of typical temperature requirements.

Low Temperature

Galden® HT 55, HT 70 and HT 80 are ideally suited for applications requiring transferring heat at temperatures well below the water freezing point. These products enable thermal management in conditions far below what can be achieved by other products while maintaining the unique non-flammability characteristics that distinguish fluorinated fluids.

Medium Temperature

Galden® HT 110, H 135 and HT 170 perfectly cover the applications requiring a balance of low evaporative losses and leak control while maintaining good thermal transfer capabilities even at temperatures below 0°C. These fluids can also be used at moderate temperatures to replace fluids with higher evaporation rates while preserving heat transfer performance.

High Temperature

A line of dielectric fluids with boiling points above 200°C, these high-performance fluids are engineered for high-temperature applications. Thanks to their high boiling point, they offer a significantly lower evaporation rate and can work in demanding conditions up to 260°C without requiring over-pressurized systems.

Technical data sheet of Galden® HT PFPEs

		Low Temperature			Medium Temperature			High Temperature
Properties	Units	HT55	HT70	HT80	HT110	HT135	HT170	HT200	HT230	HT270
Boiling point	°C	55	70	80	110	135	170	200	230	270
Pour point	°C	<–125	<–110	–110	–100	–100	–97	–85	–77	–66
Density	g/cm³	1.65	1.68	1.69	1.71	1.72	1.77	1.79	1.82	1.85
Kinematic viscosity	cSt	0.45	0.50	0.57	0.77	1.00	1.80	2.40	4.40	14.00
Vapor pressure	torr	225	141	105	17	5.8	0.8	0.2	0.03	<10^–2
Specific heat	cal/g •°C	0.23	0.23	0.23	0.23	0.23	0.23	0.23	0.23	0.23
Heat of vaporization at boiling point	cal/g	22	17	17	17	16	16	15	15	15
Refractive index	–	1.280	1.280	1.280	1.280	1.280	1.280	1.281	1.283	1.283
Coefficient of thermal expansion	cm³/cm³ •°C	0.0011	0.0011	0.0011	0.0011	0.0011	0.0011	0.0011	0.0011	0.0011
Surface tension	dyne/cm	14	14	16	16	17	18	19	19	20
Thermal conductivity	W/m•K	0.067	0.067	0.067	0.067	0.067	0.065	0.065	0.065	0.065
Dielectric strength	kV (2.54mm gap)	40	40	40	40	40	40	40	40	40
Dielectric constant	–	1.86	1.86	1.89	1.92	1.92	1.94	1.94	1.94	1.94
Volume resistivity	Ohm•cm	1 •10¹⁴	1 •10¹⁵	1.5•10¹⁵	1.5•10¹⁵	1.5•10¹⁵	1.5•10¹⁵	6•10¹⁵	6•10¹⁵	6•10¹⁵
Average molecular weight	amu	340	410	430	580	610	760	870	1,020	1,550

Safety and Low-Maintenance

The chemical inertness of Galden® HT PFPE fluids makes them ideal candidates for all the most demanding applications. Their non-corrosivity and intrinsic stability minimize the need for fluid changes and maintenance actions, maximizing the uptime of equipment and reducing operating costs.

Galden® HT PFPE fluids have Zero Ozone Depletion Potential (ODP), nevertheless their use is encouraged in fully-sealed systems to minimize loss to the environment and reduce any environmental impact that may be connected with it.

Galden® HT PFPE Heat Transfer Fluids for High-Temperature Industrial Applications