[time-nuts] Re: Potting compound advice needed

[djl]

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.
----------------------
Dr. Don Latham  AJ7LL
PO Box 404, Frenchtown, MT, 59834
VOX: 406-626-4304