Locks QARA HT38 is a low viscosity heat transfer oil formulated on highly refined high viscosity index Alkylbenzene oil. It is specially designed for closed heat transfer systems with bulk oil temperatures up to 320℃. Locks QARA HT38 can also be used as a General purpose quenching oil. Life of any oil in an open system declines rapidly at temperature beyond 100℃. High oxidation stability for our HT 38 ensure longer life span of oil.