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I was thinking more of a truely inert/completely non-flamable fluid, ie, some type of PFPE oil, but one that is economically feasable. Any suggestions?

I am searching for a barrier seal fluid/heat transfer fluid/lubricant that can a withstand constant temperature of 225C with spikes to 450C. Moreover, it needs to be inert/non-flamable and can't cost $1,000's per gallon, like Krytox. Any help would be greatly appreciated. Thanks. John