Perfecto™ HT 2 (previously called Transcal LT) is a high quality mineral oil combining low vapour pressure and high levels of thermal stability, specific heat and thermal conductivity with exceptional low temperature fluidity. Perfecto HT 2 is recommended primarily for non-pressurized closed liquid phase heating systems that incorporate both heating and cooling branches (eg: where an exothermic or heat releasing reaction takes place). The low temperature fluidity ensures that adequate circulation occurs in the coolest parts of the circuit. The maximum recommended bulk fluid temperature for Perfecto HT 2 is 250°C, and the fluid also operates effectively in cooling systems down to bulk temperatures of 30°C. Before being commissioned, the system should be pressure tested for leaks and then thoroughly flushed with Perfecto HT 2. Water should never be used.