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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