Therminol 58 Temperature Range

Performance Benefits

  • Optimal pumpability – Non-sludge-producing chemistry enables pumpability at lower temperatures than the majority of other mineral oil-based heat transfer fluids.
  • Excellent compatibility – Therminol 58 is noncorrosive to metals commonly used in the construction of heat transfer systems.
  • Excellent resistance to fouling – Therminol 58 has been shown to be significantly less sensitive than mineral oils to the negative consequences (sludging, fouling) of thermal oxidation.

Typical Properties

AppearanceClear yellow liquid
CompositionSynthetic hydrocarbon mixture
Maximum bulk temperature300°C (575°F)
Maximum film temperature339°C (642°F)
Normal boiling point352°C (665°F)
Pumpability, at 300 mm2/s (cSt)-6°C (21°F)
Pumpability, at 2000 mm2/s (cSt)-26°C (-15°F)
Flash point, COC (ASTM D-92)195°C (383°F)
Autoignition temperature (ASTM E-659)351°C (664°F)
Pour point (ISO 3016)-54°C (-65°F)
Minimum liquid temperatures for fully developed turbulent flow (NRe > 10000)
10 ft/sec, 1 in tube (3.048 m/s, 2.54 cm tube)69°C (156°F)
20 ft/sec, 1 in tube (6.096 m/s, 2.54 cm tube)47°C (117°F)
Minimum liquid temperatures for transitional region flow, (NRe > 2000)
10 ft/sec, 1 in tube (3.048 m/s, 2.54 cm tube)26°C (79°F)
20 ft/sec, 1 in tube (6.096 m/s, 2.54 cm tube)14°C (57°F)
Coefficient of thermal expansion at 200°C0.000975/°C (0.000542/°F)
Heat of vaporization at max. use temperature248.1 kJ/kg (107.1 Btu/lb)
Average molecular weight312
Pseudocritical temperature496°C (925°F)
Pseudocritical pressure13.07 bar (189.6 psia)
Pseudocritical density261.3 kg/m3 (16.31 lb/ft3)
Moisture content, maximum (ASTM E-203)150 ppm
Dielectric constant @ 23°C (ASTM D-924)2.4
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