Open systems are atmospherically open, as semi-open systems are referred to open baths with lids. The thermally active heat transfer medium in closed cold oil superimposed circuits has no direct contact with ambient air.

• Boiling point: >190 °C
• Density: 855 kg / m³
• Solvents used are petrol, acetone, alcohols

Recommended temperature range: –95 to +60 °C (open system) and –95 to +160 °C (closed system).