Heat Transfer Fluid

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Heat Transfer Fluid

Duratherm S

  • "Duratherm saves money in the long run." — J. Smith
  • "I've even recommended Duratherm to the equipment manufacturer." — Ed Slack
  • "We have had no issues with Duratherm versus the old oil we were using." — J. Cowger Jr.
  • "I've had zero failures in over a year-and-a-half since using Duratherm." — R. Barnett
  • "Duratherm provides excellent heat transfer characteristics." — Ryan Seward
  • "Yet another bonus was that the pricing was below comparable fluids." — S. Bailey Sr.
  • "Duratherm is working great." — K. Rose
  • "Duratherm is the best heat transfer fluid we've ever used." — Larry Daniels
  • "This stuff is pretty amazing." — Ryan Seward
  • "Duratherm HF has been performing remarkably well." — Raghu Kamath
  • "The fluid is still clear … I can see the bottom of the tanks." — S. Bailey Sr.
  • "A few companies along the way have been helpful, but none like Duratherm." — K. Rose
  • "Duratherm G is working excellently!" — Ian Smiley
  • "The heat transfer works better than any of the other fluids we have tried." — Lars Hvalby
  • "We have increased the time between oil changes and nearly eliminated any issues." — J. Smith
  • "I would highly recommend this product over any other heat transfer fluid." — J. Cowger Jr.
  • "Duratherm is working great." — J. Cowger Jr.
  • "Our oxidation problems have disappeared." — H. Blair
  • "Duratherm does not sludge up at all." — Bill Corbett
  • "I commend you on the quality and longevity of your products." — H. Blair
  • "Duratherm 600 is the best fluid we’ve ever used!" — John Wanninger
  • "Duratherm XLT-120 is exactly what we needed!" — Luke Colby
  • "This will definitely be my go-to fluid for future projects." — Ryan Seward
  • "Duratherm was one of the best moves we made. Working great!" — Neil McDivitt
  • "These products performed exceptionally well for us." — S. Poletto
  • "The fluid is working better than expected." — Dick Livingston
  • "The difference between Calflo and Duratherm was amazing." — J. Gerbec

Duratherm S heat transfer fluid is ideal for applications such as negative pressure mold heaters,  annealing tanks, open bath forming, or any processing equipment where oxidation is prevalent and problematic. Duratherm S heat transfer fluid resists the effects of oxidation seen with most other heat transfer fluids.

High-temperature stability is maintained to 650°F.This combined with a low end working temperature of -40°F also makes Duratherm S heat transfer fluid ideally suited for low-temperature applications, batch processing or any application requiring a single fluid for both heating and cooling.

Duratherm S is an extremely oxidative and thermally stable heat tranfer fluid offering precise temperature control in applications requiring the highest level of oxidative stability with high- and low-termperature workability.

The Difference

  • Superior oxidation resistance∗ (virtually unaffected)
  • Non-fouling - extremely long life
  • Low odor
  • Non-corrosive
  • Non-hazardous
  • Non-toxic
  • Extremely high working temperature (650°F)
  • Extremely low working temperature (-40°F)

Lasts Longer

Duratherm S heat transfer fluid is a high-performance, extremely stable, long-lasting silicone-based heat transfer fluid.

Virtually unaffected by oxidation∗, Duratherm S heat transfer fluid is perfect for use in a variety of applications requiring a safe, non-reportable, non-toxic and non-corrosive heat transfer fluid.

∗Call for application recommendations.

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Duratherm S Properties
Appearance: clear liquid, slight yellow tint
Maximum bulk Temp. (Closed System) 650°F 343°C
Maximum bulk Temp. (Open System) 400°F 204°C
Flash Point ASTM D92 615°F 323°C
Fire Point ASTM D92 636°F 335°C
Autoignition ASTM E-659-78 818°F 436°C
Viscosity ASTM D445    
cSt at -58°F / -50°C 334.2  
cSt at -13°F / -25°C 177.4  
cSt at 100°F / 38°C 37.5  
cSt at 212°F / 100°C 17.4  
cSt at 500°F / 260°C 4.4  
cSt at 600°F / 316°C 3.3
Pour Point ASTM D97 -87°F -66°C
Density ASTM D1298 lb/ft3 g/ml
at 100°F / 38°C 59.7 0.956
at 500°F / 260°C 53.4 0.855
at 600°F / 316°C 51.8 0.829
Carbon Residue ASTM D189 0.01 % Mass
Sulphur Content X-RAY <.001 weight %
Thermal Expansion Coefficient 0.055 %/°F 0.105 %/°C
Thermal Conductivity BTU/hr F ft W/m K
at 0°F / -17°C 0.081 0.140
at 100°F / 38°C 0.075 0.129
at 300°F / 148°C 0.061 0.105
at 500°F / 260°C 0.048 0.083
at 600°F / 316°C 0.042 0.072
Heat Capacity BTU/lb F kJ/kg K
at 0°F / -17°C 0.382 1.599
at 100°F / 38°C 0.403 1.687
at 300°F / 148°C 0.449 1.879
at 500°F / 260°C 0.495 2.072
at 600°F / 316°C 0.518 2.168
Vapor Pressure ASTM D2879 psi kPa
at 100°F / 38°C 0.00 0.00
at 500°F / 260°C 0.30 2.06
at 600°F / 316°C 1.01 6.96

*The values quoted in the table above are typical of normal production. They do not constitute a specification.

Technical Papers

Heat Transfer Fluid Basics

Selecting a Fluid

Using a Heat Transfer Fluid

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