Xeltherm 600 Heat Transfer Fluid 330 Gallon ToteXeltherm 600 Heat Transfer Fluid 330 Gallon Tote The most premium thermal oil available for use up to 600oF (315oC), has a longest life of any fluid of its type, is pure, non toxic and odorless. Food contact rated, NSF (HT1) FDA. Recommended for food processing, processing of natural gas, packaging, plastic extrusion, chemical processing, micro concentrated solar power and many other applications. Key Operating Temperatures Maximum Bulk Fluid