The material covered by this specification is intended for use as a heat transfer medium in closed systems and capable of functioning as a dielectric fluid over the temperature range of −54 °C to 135 °C. Dielectric coolant is used to cool aircraft radar, aircraft avionics systems, missiles, and navigation systems.

Prior to use in the intended equipment, the product may be stored under conditions of covered or uncovered storage in geographic areas ranging in temperature from −54 °C to +50 °C.

Additional data is included in table III to serve as user information which will be referred to as typical (inherent) and will not be a requirement levied upon the supplier. TABLE III. Typical properties of the finished coolant.

Characteristic Inherent Value ------------------------------------------------------------------------------------------------- Specific gravity @ 25 °C (77 °F) 0.809 @ 15.6 °C (60 °F) 0.805 Coefficient of thermal expansion (cm³/cm³ °C) 2.7 × 10⁻⁴ Thermal conductivity (cal-cm/s-cm² °C) @ −40 °C (−40 °F) 4.5 × 10⁻⁴ @ 0 °C (32 °F) 3.8 × 10⁻⁴ @ 150 °C (302 °F) 3.0 × 10⁻⁴ Specific Heat (cal/gm/°C) @ −40 °C (−40 °F) 0.48 @ 25 °C (77 °F) 0.53 @ 75 °C (167 °F) 0.55 @ 149 °C (300 °F) 0.65

This fluid is completely miscible and compatible with MIL-C-47220 and may be interchangeable with several of the types listed therein depending on the application.