Low Temperature Silicone Bath Fluids

Chemical Name: Linear Polydimethylsiloxane (Dimethylpolysiloxane) Oils

CAS No. 63148-62-9

View product specs:
PSF-2cSt Silicone Bath Fluid (-80°C to 120°C closed system only)
PSF-5cSt Silicone Bath Fluid (-70°C to 65°C open system) (-70°C to 150°C closed system)
PSF-10cSt Silicone Bath Fluid (-60°C to 100°C open system (-60°C to 200°C closed system)
PSF-20cSt Silicone Bath Fluid (-50°C to 150°C open system) (-50°C to 220°C closed system)

View SDS:
PSF-2cSt Silicone Bath Fluid
PSF-5cSt Silicone Bath Fluid
PSF-10cSt Silicone Bath Fluid
PSF-20cSt Silicone Bath Fluid

Availability:: 1-gallon (3.785 liters), 5-gallon pail (18.9 liters) & 55-gallon drum

Chemical Composition: Linear Polydimethylsiloxane (Dimethylpolysiloxane) Fluids

Product Equivalent: Dow Corning 200® fluid, 2cs, Dow Corning 200® fluid, 5cs, Dow Corning 200® fluid, 10cs, Dow Corning 200® fluid, 20cs, Baysilone Oil M3, Baysilone Oil M5, Baysilone Oil M10, Baysilone Oil M20, Baysilone KT3, Baysilone KT5, Baysilone KT10, Baysilone KT20, GE SF96-5, GE SF96-20, Shinetsu DM-5, Shinetsu DM-10, Shinetsu DM-20, Rhodorsil® 47 V 5, Rhodorsil® 47 V 10, Rhodorsil® 47 V 20, Xiameter® PMX-200 Silicone Fluid 5cs, Xiameter® PMX-200 Silicone Fluid 10cs, Xiameter® PMX-200 Silicone Fluid 20cs, Momentive Element® 14 PDMS 5, Momentive Element® 14 PDMS 10, Momentive Element® 14 PDMS 20, Hart Scientific® 5010 Silicone Oil Type 200.05, Hart Scientific® 5012 Silicone Oil Type 200.10, Hart Scientific® 5013 Silicone Oil Type 200.20, Fluke® 5010 Silicone oil Type 200.05, Fluke® 5012 Silicone oil Type 200.10, Fluke® 5013 Silicone oil Type 200.20

Low Temperature Pure Silicone Bath Fluids are low-viscosity linear 100% Polydimethylsiloxane fluids that are formulated for Low Temperature Baths and Low Temperature Heat Transfer Applications. Low Temperature Pure Silicone Bath Fluids are clear, colorless, odorless, and inert to virtually all bath instruments and plastics.

Low Temperature Silicone Bath Fluids encompass a viscosity range from 2cSt to 20cSt* (measures @ 25°C). Due to their low flash points and high rates of volatility, viscosities below 5cSt are not recommended for thermal applications above ambient temperatures in open systems. High rates of evaporation will require frequent replenishment.

Low Temperature Silicone Bath Fluids have low viscosity-temperature coefficients (VTC), and will experience little viscosity increase even at extremely low temperatures. The Viscosity-temperature coefficient or VTC is a measure of viscosity @99°C ÷viscosity @ 38°C. Thus, the lower the VTC #, the lower the viscosity changes. This is critical for baths that have pumping systems that cannot operate with higher viscosity fluids. For the lowest temperature stability, we recommend the PSF-2cSt.

Bath Applications include: low temperature open system baths, low temperature closed system baths, low temperature constant temperature baths, low temperature circulating baths, low temperature circulator baths, low temperature refrigerated baths, low temperature closed loop baths, heat transfer baths, heat transfer fluid in freeze drying equipment, thermostats and cryostat fluids, calibration bath fluids for low temperature, silicone fluid for temperature control systems

*cSt (cs) is a centistokes [mm2/sec]... measure of kinematic viscosity

**Closed system baths are systems from which air has been excluded.


  • 100% Linear Polydimethylsiloxane Fluids
  • Clear, colorless & odorless fluids... allows you to see instrumentation inside of the bath.
  • Low viscosity: excellent viscosities for circulating baths.
  • Low pour points
  • Excellent low temperature stability with little viscosity increase (low VTC)
  • Exhibit significantly less viscosity change than petroleum based oils.
  • Formulated from synthetic sources.
  • Long service life when used for recommended temperature ranges.
  • Inert to virtually all bath instrumentation and plastics
  • Environmentally friendly – VOC Exempt & HAP Free
  • Hydrophobic- will not absorb water
  • High Dielectric Strength

Product Data:

Property PSF-2cSt PSF-5cSt PSF-10cSt PSF-20cSt
Chemical name PDMS Silicone PDMS Silicone PDMS Silicone PDMS Silicone
CAS # 63148-62-9 63148-62-9 63148-62-9 63148-62-9
Appearance clear, colorless clear, colorless clear, colorless clear, colorless
Odorless Yes Yes Yes Yes
Hydrophobic Yes Yes Yes Yes
Viscosity @ 25°C 2cSt 5cSt 10cSt 20cSt
V.T.C. 0.48 0.54 0.56 0.59
Soluble in water No No No
Pour point -100°C -90°C -70°C -60°C
Flash point 75°C 135°C 163°C 232°C
Boiling point 229°C >200°C >200°C >230°C
Vapor pressure @ 25°C 1mmHg <1mmHg <1mmHg <1mmHg
Specific heat @ 25°C J/g °C 1.8 1.8 1.8 1.7
Thermal expansion cc/cc/°C 0.00117 0.00112 0.00108 0.00107
Thermal conductivity g/cal/cm/sec °C 0.00026 0.00028 0.00032 0.00034
Open system Service temperature Closed system only -70°C to 65°C -60°C to 100°C -50°C to 120°C
Closed system Service temperature -80°C to 120°C -70°C to 150°C -60°C to 200°C -50°C to 220°C