I forgot to mention that it can be removed nicely with hot air, and has
the very nice property that you can solder things that are coated just
in case you should make a misteak. it is soft. I did not know the
epsilon or tand.
Don
On 2021-11-11 17:49, Lux, Jim wrote:
On 11/11/21 4:00 PM, djl wrote:
I've used, wait for it, beeswax as a potting compound. Gouda cheese
comes coated with it (some has paraffin, get the best,) in a lovely
red. I also found out some years ago that Catholic churches use pure
beeswax for large (not votive) candles and may give you the stubs.
Nice, clean white. Or, dear ol' Amazon has a huge assortment for
around $1.00 / oz, in various stages of "purification". For expensive
beeswax with some unknown sticky additives, use toilet mounting
rings... (good also for preserving dry milsurp gunstocks, according to
Anvil.)
73, Don
Beeswax, if perfectly dry, and no carbon residue, is pretty good RF
wise - at 1 MHz, epsilon is around 2.5, tan d is around 0.01 which is
ok, but not great. You could mix it with microballoons to lower
epsilon and dissipation.
It does shrink and, of course, it's pretty soft.
Pointing back to a previous suggestion 3M DP270 - that's 3.5 epsilon
and 0.018 tan d, but at 1kHz. The graph in the datasheet does show
pretty constant 0.020 up to 1 MHz.
http://www.emesystems.com/pdfs/parts/DP270.pdf
At least it's available in less than a gallon quantities.
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The whole world is a straight man.
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Dr. Don Latham AJ7LL
PO Box 404, Frenchtown, MT, 59834
VOX: 406-626-4304
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