Servosynturbo GF 46 is phosphate ester based, fire resistant, turbine governor fluid designed for use in electrohydraulic governor control systems of steam turbines operating at higher steam temperature and pressure, including systems using fine tolerance Servo Valves. It is approved by BHEL against its ST 22007 standards. Servosynturbo has approval of Siemens under TLV 9012 02 specs. Servosynturbo GF 46 is also approved by GE Power under DIN EN 14832 standard.