THERMAL STABILITY AT 750F OF HIGH TEMPERATURE FLUIDS AND FLUID INTERMIXTURES.
ARMY WEAPONS COMMAND ROCK ISLAND ILL RESEARCH AND ENGINEERING DIV
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The thermal stability of six high temperature fluids and twelve of their most stable intermixtures was evaluated at 750F for a period of six hours under nitrogen in the presence of copper, titanium, steel and monel metal specimens. When each of the six fluids was tested individually, polyphenyl ether and phenyl methyl polysiloxane displayed outstanding stability. A chlorinated biphenyl fluid was moderately stable but was corrosive to several metals. Diphenyl bis-n-dodecyl silane, tetra 2-ethyl-hexyl ortho silicate and deep dewaxed, super refined mineral oil all underwent severe degradation. Among the fluid intermixtures, five displayed good to moderate thermal stability. These generally consisted of combinations of the three most stable fluids. Most mixtures containing the silicate and mineral oil fluids as well as these two fluids when tested separately, could be ignited at room temperature after exposure to 750F. The metals most resistant to fluid attack were copper and titanium. Author
- Lubricants and Hydraulic Fluids