Technical data

Thermal HS

JULABO Thermal HS is a silicone-based bath fluid.

Working temperature: +50 °C ... +250 °C


  • High stability
  • Excellent heat conductivity
  • Minimum odor
  • Long fluid life

JULABO Thermal bath fluids are carefully selected and long-term tested media with ideal thermodynamic properties for a variety of applications. These bath fluids are ideally suited for temperature applications using JULABO instruments, and ensure safe, reliable operation as well as optimum heat transfer efficiency.

JULABO Thermal bath fluids are silicone based and chemically inert, which means they do not act upon metals like iron, copper, zinc, aluminum, chrome, or nickel. Compared to other fluids, JULABO Thermal bath fluids have an extraordinarily low electrical conductivity. When properly stored, these fluids will last for 12 months or longer since they are not susceptible to climatic influences. Proper use ensures a long service life because minimal cracking and oxidation degradation will occur. When using fluids at working temperatures close to the recommended limit values, we recommend checking or replacing the fluid every 2–3 months. Some JULABO silicone-based bath fluids contain a stabilizer to delay oxidation, which extends the service life of the oil.

Do not use with silicone tubing! Silicone-based bath fluids can cause silicone tubing to dissolve. Therefore, JULABO metal tubing, JULABO Viton tubing, or JULABO PTFE tubing must be used for temperature control applications involving external systems.

Please note: If the fluid is used below the specified lowest working temperature, this can cause the temperature to fluctuate or the overtemperature alarm to trigger because the fluid on the heater is too hot. Recommendation: Reduce the heater capacity during the heat-up process until the lowest specified working temperature is reached.

Technical data

Order number 5 liters 8940103
Order number 10 liters 8940102
Working temperature +50 ... +250 °C
Flash point >250 °C
(kinematic at 20 °C)
50 mm²/s
(at 20 °C)
0.97 g / cm³
Pour point <-60 °C
Boiling point >300 °C
Ignition temperature >+400 °C
Color light brown
Thermal expansion coefficient 0.00089 (g/(ml × K))
Heat conductivity 0.153 (W/(m × K))
Specific volume resistivity 6x10¹⁴ (Ohm × cm)





Specific heat capacity



Safety Data Sheet

PDF 86.4 KiB

Product Data Sheet

Thermal HS