Dowtherm, properties

Figure 2-9, Physical properties Dowtherm "G" versos temperature. (From Practical Heat Recovery, John L. Boyen, John Wiley Sons, Inc., 1975.)...

PCDEs are used as intermediates in chemical syntheses, e.g. production of herbicides chloroxuron, 2,4-dichlorophenyl-p-nitrophenyl ether (nitrofen) and binofex [300]. Because PCDEs have physico-chemical properties like PCBs, they are or were used also as heat exchangers. One product is Dowtherm A, a PCDE - PCB mixture, with heat transfer applications. However, in general their use pattern is unknown [301]. Beside the use as heat-exchange fluids, the lower chlorinated PCDEs have been used as flame retardants. It must be also stated that the PCDEs were never directly produced in large quantities. Nevertheless, these aromatic chlorinated compounds have been identified as widespread environmental contaminants. The widespread appearance of PCDEs in the aquatic and terrestrial environment could be most likely due to their presence as... 

Table C.3 Properties of Dowtherm A Heat Transfer Flirid...

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