Niche hydraulic fluids

NaK-77, a eutectic alloy of sodium and potassium, can be used as a hydraulic fluid in high-temperature and high-radiation environments, for temperature ranges of 10 to 1400 F. Its bulk modulus at 1000 °F is 310,000 psi (2.14 GPa), higher than of a hydraulic oil at room temperature. Its lubricity