Active Chemical Systems Specializes Exclusively in Graphite Heat Exchangers for Industrial Process Heating Impervious Graphite Immersion Plate Process Heaters Graphite Immersion Plate Process Heat Exchangers are an excellent choice of equipment for direct heating or cooling of tanks, where external heat exchangers are not an option. Graphite Cylindrical Block Process Heat Exchangers Can be designed from one piece blocks as long as 72". This eliminates the need for many inter-block gaskets, which can be a cause of maintenance and downtime. Graphite Cubic Block Process Heat Exchangers Graphite Cubic Block process heat exchangers are the most efficient units available. They have a small foot-print with a high amount of heat transfer surface area. We can provide units in excess of 400 square feet of surface area. Graphite Shell and Tube Process Heat Exchangers These units are built to last, because of our Impreg-Tite™ phenolic resin impregnation process. This eliminates problems experienced in the past by most graphite shell and tube units.