High Viscosity Quenching Oil is used for general quenching purpose and acts as a straight mineral oil. The Quenching Oil is a high viscosity oil with good oxidation stability and fluidity. The Quenching Oil is an invert impulsion fluid and used where there is fire risk and contains anti-wear, antifoaming and stable emulsion characteristics. High Viscosity Quenching Oil is a kind of fire resistant hydraulic fluid.