Duratherm S

A silicone based heat transfer fluid that is ideally suited for high oxidation applications or completely exposed systems. Duratherm S is virtually impervious to oxidation at temperatures under 204°C (400°F) and offers superior protection from fluid degradation. Duratherm S is best suited for applications not prone to contamination or leaking.

  • 316°C (600°F) maximum operating temperature
  • Pumpable down to -50°C (-46°F)
  • Very strong resistance to oxidation up to 204°C (400°F)
  • Recommended for use in fully exposed systems like open baths
  • Highly resistant to fouling for an extremely long service life
  • Non-corrosive and non-toxic thermal fluid for added workplace safety
Temerature Ratings
Maximum Bulk/Use Temp 316°C
Maximum Film Temp 366°C
Pour Point ASTM D445 -66°C
Safety Data
Flash Point ASTM D92 324°C
Fire Point ASTM D92 336°C
Auto Ignition ASTM E-659-78 437°C
Thermal Properties
Thermal Expansion Coefficient 0.1782 %/°C
Thermal Conductivity W/m·K
38°C 0.133
204°C 0.109
260°C 0.1
288°C 0.097
316°C 0.093
Heat Capacity kJ/kg·K
38°C 1.717
204°C 2.034
260°C 2.144
288°C 2.194
316°C 2.248
Physical Properties
Viscosity ASTM D445 cSt
40°C 36.14
100°C 16.57
260°C 5.19
288°C 4.54
316°C 4.03
Density ASTM D1298 d/ml
38°C 0.949
204°C 0.811
260°C 0.767
288°C 0.744
316°C 0.721
Vapour Pressure ASTM D2879 kPa
38°C 0
204°C 0.138
260°C 1.793
288°C 3.516
316°C 6.826
Distillation Range ASTM D2887
10% 495°C
90% 680°C

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