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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
Standard
Metric

Temperature Ratings

Max Bulk/Use Temp 316°C
Max Film Temp. 366°C
Pour Point ASTM D445 -66°C

Safety Data

Flash Point ASTM D92 324°C
Fire Point ASTM D92 336°C
Autoignition ASTM E-659-78 437°C

Thermal Properties

Thermal Expansion Coefficient 0.055 %/°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 kg/l
38°C 0.949
204°C 0.811
260°C 0.767
288°C 0.744
316°C 0.721
Vapor 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.

Temperature Ratings

Max Bulk/Use Temp 600°F
Max Film Temp. 690°F
Pour Point ASTM D445 -87°F

Safety Data

Flash Point ASTM D92 615°F
Fire Point ASTM D92 636°F
Autoignition ASTM E-659-78 818°F

Thermal Properties

Thermal Expansion Coefficient 0.099 %/°F
Thermal Conductivity BTU/hr·ft·F°
100°F 0.077
399°F 0.063
500°F 0.058
550°F 0.056
Heat Capacity BTU/lb·F°
100°F 0.41
399°F 0.4858
500°F 0.512
550°F 0.524

Physical Properties

Viscosity ASTM D445 cSt
40°F 68.4
100°F 37.42
260°F 12.8
Density ASTM D1298 lb/ft³
100°F 59.23
399°F 50.60
500°F 47.88
550°F 46.44
Vapor Pressure ASTM D2879 psia
100°F 0
399°F 0.02
500°F 0.26
550°F 0.51
Distillation Range ASTM D2887
10% 922°F
90% 1255°F

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

Duratherm S