High Temperature Silicone Bath Fluids

Product Description: High Temperature Silicone Bath Fluids are formulated for stability at temperatures >200°C (open to air) and 300°C (closed to air). They are characterized by their high thermal stability, high flash points, high resistance to oxidation, high dielectric strength, and inertness to virtually all components.

PM-50 High Temperature Silicone Bath Fluid hast the lowest viscosity and can be used at lower temperatures without an acute viscosity increase.

View product specs:
DPDM-400 High Temperature Silicone Bath Fluid (25°C to 250°C open system) (25°C to 300°C closed system)
PM-125 High Temperature Silicone Bath Fluid (25°C to 230°C open system) (25°C to 300°C closed system)
PM‐50 High Temperature Silicone Fluid (‐40°C to 204°C open system) (‐40°C to 260°C closed system)
HT-110 High Temperature Silicone Bath Fluid (‐40°C to 250°C open system) (‐40°C to 250°C closed system)

View SDS:
DPDM-400 High Temperature Silicone Bath Fluid
PM-125 High Temperature Silicone Bath Fluid
PM-50 High Temperature Silicone Fluid
HT-110 High Temperature Silicone Bath Fluid

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

Product Equivalent:
PM-125:Dow Corning 550® Fluid, DC 550®
HT-110:Dow Corning 210H®, Cole Palmer® R-01294-60 Silicone 210

Product Alternative: DPDM-400 & PM-125 High Temperature Bath Fluid are cost-effective alternatives for DC® 710 Fluid or DC® Silicone Oil Type 710, Hart Scientific® 5017 Silicone Oil Type 710, Fluke® 5017 Silicone Oil Type 710, Cole Palmer® R-01294-00 Silicone 710, Dow Corning 550® Fluid, DC 550®, Dow Corning 210H®, Cole Palmer® R-01294-60 Silicone 210

High Temperature Silicone Bath Fluids are formulated for high temperature baths applications and high temperature heat transfer applications that exceed 200°C

DPDM-400 High Temperature Bath Fluid is a clear, colorless and odorless Diphenyl-Dimethylsiloxane (CAS# 68083-14-7) with a viscosity of 400cSt. It remains stable at 250°C (open system) for 1,500 to 2,000 hours without gelling or breaking down. In closed system baths*, DPDM-400 High Temperature Bath Fluid remains stable at 300°C.

PM-125 High Temperature Bath Fluid is a clear, colorless and odorless Phenylmethylsiloxane (CAS # 63148-52-7) with a viscosity of 125cSt. It has a long term operating temperature range of 230°C (open system). At 250°C (open system), it remains stable for approximately 1,200 hours without gelling or breaking down. In closed system, PM-125 High Temperature Silicone Bath Fluid remains stable at 300°C.

Although DPDM-400 and PM-125 High Temperature Bath Fluids have pour points of –30°C and –51°C, they are not recommended for low temperature applications due to their high VTC (viscosity-to-temperature coefficient). At low temperatures, their viscosities increase significantly making them poor choices for applications below ambient.

PM-50 High Temperature Silicone Fluid is a low Phenyl content silicone with a viscosity of 50cst @ 25C. Like the PM-125 and DPDM-400, it remains stable at elevated temps. Unlike the DPDM-400 and PM-125, the PM-50 can operate at lower temps without the acute viscosity increase. It has the further advantage of a lower viscosity at room temp, which makes it easy to pump and circulate.

HT-110 High Temperature Silicone Bath Fluid is a Polydimethylsiloxane Silicone oil 100cst viscosity (CAS# 63148-62-9) that is heat-stabilized with an iron-siloxane additive for high temperature stability >200°C (open and closed system). Due to the heat stabilizing additive, HT-110 High Temperature Silicone Bath Fluid offers significantly higher thermal stability than standard PDMS fluids, which breakdown at temperature well below 200°C in an open system..

However, due to the iron‐siloxane additive, HT‐110 High Temp Silicone Bath Fluid has a brownish color and an odor. Because of its murky‐brown color, it is not recommended for applications where the instruments need to be visible. HT‐110 has been described as a “PDMS Silicone oil on steroids”. Essentially, it is a cost‐effective fluid that bridges the gap between the PDMS class and the Phenyl class of silicones fluids.

Properties

  • High temperature stability @ temperatures of 250®C (open system) and 300®C (closed system)
  • High flash points
  • Good heat capacity values
  • PM-50, PM-125 and DPDM-400 are clear, colorless and odorless
  • DPDM-400 & PM-125 are clear, colorless and odorless
  • Viscosity of DPDM-400 & PM-125 will lower quickly as soon as heated…no strain on circulators in high temp baths
  • Low vapor pressure
  • High resistance to oxidation
  • High Dielectric Strength
  • Low volatility
  • Inert to virtually all bath instrumentation and plastics
  • Environmentally friendly – VOC Exempt
  • Hydrophobic- will not absorb water

Applications include: high temperature open system baths, high temperature closed system baths, constant temperature baths, circulating thermal temperature baths, closed loop baths, high temperature heat transfer baths, high temperature heat transfer fluids, thermostat fluids, calibration bath fluids, flow test fluids, high temperature solar panel heat transfer fluid, high temperature Downhole fluid.

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

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

Properties:

Property PM-125 DPDM-400 PM-50 HT-110
Chemical name Phenylmethylsiloxane Diphenyl-Dimethylsiloxane Phenylmethylsiloxane Polydimethylsiloxane heatstabilized with iron siloxane additive
CAS # 63148-52-7 68083-14-7 63148‐52‐7 63148-62-9
Appearance Clear fluid Clear fluid Clear fluid Brownish fluid
Odorless Yes Yes Yes No...mild odor
Viscosity @ 25C 125cSt 400cSt 50cSt 100cSt
VTC (viscosity-temp-coefficient) 0.76 0.82 0.61 0.60
Flash point 315°C 315°C 315°C >288°C

Long-term operating stability:

  DPDM-400 PM-125 PM-50 HT-110
Open system (presence of air) 250°C 230°C 204°C >250°C
Closed system (closed to the atmosphere) 300°C 300°C 260°C >250°C

Gel Time at Temperature (open system):

Fluid 149°C 204°C 250°C 260°C 300°C
PSF-100cSt Approx 1-year 250 to 300 hours 40 to 60 hours 20 to 25 hours <24 hours
PM-50 ++ 1-year >300 hours 240 hours
DPDM-400 ++ 1-year >5,000 hours 1,500 hours 200 + hours > 100 hours
PM-125 ++ 1-year >5,000 hours 1,000 – 1,500 hours 200 hours > 100 hours
See Also Silicone Heat Transfer Fluids