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'[EE]: Beeswax Encapsulation'
2000\07\21@191750 by James Cameron

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On Tue, Jul 18, 2000 at 02:41:02PM +1200, Lance Allen wrote:
> Later we used complete encasement in beeswax , it helped alot.

Within nothing underneath?  Beeswax is probably available to me here in
the outback ... I can always hunt down a beehive.  I remember trying
encapsulation with candlewax once, and found slight corrosion of some
metals.  Can you place your entire PCB in it or should you coat with
something else first?

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2000\07\23@162239 by l.allen

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> On Tue, Jul 18, 2000 at 02:41:02PM +1200, Lance Allen wrote:
> > Later we used complete encasement in beeswax , it helped alot.
>
> Within nothing underneath?  Beeswax is probably available to me here in
> the outback ... I can always hunt down a beehive.  I remember trying
> encapsulation with candlewax once, and found slight corrosion of some
> metals.  Can you place your entire PCB in it or should you coat with
> something else first?
>
> --
> James Cameron    .....quozlKILLspamspam@spam@us.netrek.org     http://quozl.netrek.org/
>
> --


I found that beeswax never corroded any metal, but I must confess
that if a project was deemed to need total encasement then I would
spray it with conformal coating first. Without encasement in
beeswax the marine environment was lethal on the slightest or
smallest uncoated surface, give it a scratch to work with and in no
time at all that salt water had eaten its way through half the circuit.
_____________________________

Lance Allen
Technical Officer
Uni of Auckland
Psych Dept
New Zealand

http://www.psych.auckland.ac.nz

_____________________________

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2000\07\24@041048 by Alan B. Pearce

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>I remember trying encapsulation with candlewax once,
>and found slight corrosion of some metals.  Can you
>place your entire PCB in it or should you coat with
>something else first?

I would hope beeswax is non-corrosive - after all bees keep honey in it, and we
extract the honey to eat .......

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2000\07\24@042333 by Ries van Twisk

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I don't think beeswax is corrosive.
I just read a story about someone cleaning and rebuilding a esl.
He had to meld the beeswax to see what electrnics they where using.
Still I don't think it's the best solution to pack the electronics.

Ries

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2000\07\24@042750 by Michael Rigby-Jones

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> -----Original Message-----
> From: Alan B. Pearce [SMTP:EraseMEA.B.Pearcespam_OUTspamTakeThisOuTRL.AC.UK]
> Sent: Monday, July 24, 2000 9:09 AM
> To:   PICLISTspamspam_OUTMITVMA.MIT.EDU
> Subject:      Re: [EE]: Beeswax Encapsulation
>
> >I remember trying encapsulation with candlewax once,
> >and found slight corrosion of some metals.  Can you
> >place your entire PCB in it or should you coat with
> >something else first?
>
> I would hope beeswax is non-corrosive - after all bees keep honey in it,
> and we
> extract the honey to eat .......
>
How many of us guzzle Coke?  You don't want that stuff on your PCB's believe
me.  Not everything that is fine for us to eat is non-corrosive to other
materials.  Don't forget we have some fairly corrosive stuff in our stomachs
anyway.

Hmm...enough of that, far too early on a Monday morning to be thinking of
the contents of peoples stomachs...

Mike

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2000\07\24@070742 by Martin Hill

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Not a very convincing argument given that we drink coca-cola :-)

Martin

>
> I would hope beeswax is non-corrosive - after all bees keep honey in it, and we
> extract the honey to eat .......
>
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2000\07\24@071403 by Andrew Kunz

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Candle wax is mildly acidic and allows a certain amount of air to pass through
(aromatic candles need not be lit to stench up a room).

Andy









James Cameron <spamBeGonequozlspamBeGonespamUS.NETREK.ORG> on 07/21/2000 07:16:15 PM

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Subject: [EE]: Beeswax Encapsulation








On Tue, Jul 18, 2000 at 02:41:02PM +1200, Lance Allen wrote:
> Later we used complete encasement in beeswax , it helped alot.

Within nothing underneath?  Beeswax is probably available to me here in
the outback ... I can always hunt down a beehive.  I remember trying
encapsulation with candlewax once, and found slight corrosion of some
metals.  Can you place your entire PCB in it or should you coat with
something else first?

--
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2000\07\24@121020 by Lawrence Lile

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Use parrafin wax - should be available at a grocer's.  I have encapsulatesd
a lot of outdoor electronics in parrafin.

I used to fix alarms on big outdoor oil tanks.  Some idiot had encapsulated
them all with silicone caulk.  The acetic acid in the silicone had slowly
dissolved all the copper, making a huge mess.  I got the job of replacing it
after they fired his company.  We found parrafin to be very successful, and
easy to get.

These were all located inside sealed boxes (which all leaked eventually)  so
it was easy to stuff the conduits with cotton and just pour melted paraffin
into the box.

A freestanding board would need a little cardboard or plastic container to
hold the paraffin while it cooled.

-- Lawrence Lile

{Original Message removed}

2000\07\24@174442 by Peter L. Peres

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>beeswax

afaik many UHF/VHF circuits are still using beeswax to mechanically
stabilize the tuned elements inside the 'cans'. Makes a nice mess when
opening them for service, but works every time.

beeswax for electronic use has a neutral Ph (it is purified). Natural
beeswax also has a neutral Ph but it changes a little with the source. It
is relatively safe to use for short periods afaik (~1 year max).

Peter

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2000\07\29@130638 by Robert A. LaBudde

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At 09:09 AM 7/24/00 +0100, you wrote:
> >I remember trying encapsulation with candlewax once,
> >and found slight corrosion of some metals.  Can you
> >place your entire PCB in it or should you coat with
> >something else first?
>
>I would hope beeswax is non-corrosive - after all bees keep honey in it,
>and we
>extract the honey to eat .......

1. We eat tomatoes and lemons too, but their juices will dissolve aluminum
foil easily.

2. Beeswax is pretty pure, but there may be trace contaminations of acids
and salts, depending on the commercial source. (Beehive wax is quite impure!)

3. Another issue with using waxes is that they melt! (That's how candles
work.) So the hot electronic parts will create holes. Also, wax is a poor
heat conductor.

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