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XCELTHERM® SST – Typical Properties

High operating temperature of 675°F (357°C) at low pressure; liquid phase heat transfer fluid for demanding applications. Recommended for chemical refining, oil and glycol recovery units, chemical processing, gas processing, petrochemical plants and many other applications.

Typical Properties


Key Operating Temperatures
Maximum Bulk Fluid Operating Temperature 675ºF 357°C
Maximum Film Temperature 725ºF 385°C
Flash Point (PMCC)(ASTM D93) (min) 327°F 164°C
Flash Point (COC) (ASTM D92) (min) 345°F 174°C
Fire Point (ASTM D92) (min) 374°F 190°C
Autoignition Temperature (min) 779°F 415°C
Freezing/Melting Point -11.2°F  -24°C
Pumpability, at 300 mm2/s (cSt)  14°F  -10°C
Initial Boiling Point >536°F >280°C
Physical Properties
Composition Methylethylated aromatic mixture.
Odor Mild
Appearance Water-white, clear liquid
Total Acid Number (ASTM D664)                                                     < 0.01mg KOH/g
Moisture Content  (ASTM D6304) (ppm) (max) 200 ppm
Specific Gravity @ 25°C/77°F (ASTM D1298) (typical and range) 0.96 0.91 -1.10
Density, @ 25°C/77°F 7.98/lbs/gal
Critical Temperature 908.3°F 468.8°C
Critical Pressure 217.5 psia
Critical Density 16.82 lb/ft3
Kinematic Viscosity, at 40°C/104°F (ASTM D445) 11 cSt
Kinematic Viscosity, at 100°C/212°F (ASTM D445) 2.4 cSt
Coefficient of Thermal Expansion , at 200°C/392°F 0.00100/°C        0.000556/°F
Heat of Vaporization, at Maximum Use Temperature 113.6 BTU/lb 264.2 kj/kg
Average Molecular Weight 252 g/mol