THERMAL STABILITY OF NINE HIGH TEMPERATURE FLUIDS AND THEIR INTERMIXTURES.
ROCK ISLAND ARSENAL ILL
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The thermal stability of nine high temperature fluids and their intermixtures was evaluated at 650F for sixteen hours under nitrogen in the presence of a set of four metal specimens consisting of aluminum, copper, steel and monel metal. When each of the nine fluids was tested alone, polyphenyl ether and phenyl methyl polysiloxane displayed outstanding stability. Diphenyl bis-n-dodecyl silane, tetra 2-ethylhexyl ortho silicate, deep dewaxed-super refined mineral oil and chlorinated biphenyl fluids showed good stability. Tritolyl phosphate, 2-6-ditert butyl 4-methyl phenyl di-n-butyl borate and pentaerythritol-mixed fatty acid ester fluids all displayed severe fluid degradation and, except for the borate, severe metal attack. As regards inter-fluid miscibility, the silane, chlorinated biphenyl, borate and ester fluids showed complete miscibility with all the other fluids tested. Among the fluid intermixtures, twelve displayed good thermal stability. Author