Armcoltherm 650 (-60~340℃)Heat Transfer Fluid Armcoltherm 650 is a heat transfer oil composed of benzyltoluene. Its characteristics: good viscosity characteristics, super self-cleaning performance, and excellent thermal stability. It can be used as a low-temperature refrigerant and is an ideal heat transfer medium in heating and cooling processes. It is especially suitable for industries such as styrene ethylbenzene units, PBAT, and phthalic anhydride.