Everyone, thank you for the input.
I was considering the blue loctite.
I am using two small hex head screws hold two pieces of brass together. Each brass piece has a milled 1/2 radius to match the copper tubing.
If a screw should becomes loose it would be a slight pain to get at to tighten. Thus, I thought the blue thread locker would be good insurance. However, I do not know if this stuff can take the RF without melting?
Chuck
Chuck,
I scanned the 242 spec sheet today and there was no mention of RF. Only of the working temperature range. I'd guess, and it's just a guess, that unless you're getting inductive heating up to 300°F, you should be fine with 242.
ldb