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'Encase PCB with epoxy, silicone or ??? [OT]'
2000\03\19@195738 by Robert A. LaBudde

<x-flowed>At 09:08 AM 3/20/00 +1200, Lance wrote:
> > Hello Lance & PIC.ers,
> >
> >
> > Could you elaborate a bit on the `wax'  ?
> > I've seen wax used to hold parts in place in el-cheapo
> > radio sets & the like, but it just looks like candle-wax,
> > same stuff ?  or something more esoteric ?
> >
> >
> > best regards,   John
> >
>I don't know.

A 'wax' is a specific type of long-chain organic compound. It's not
corrosive, but it can function as a poor organic solvent (as would an oil).

The higher the melting point, the poorer the solvent problems, but the
greater the heat damage.

If your circuit can tolerate silicone or plastic solvents, wax should
present no problems.

Petroleum wax (used in home canning) is sold by the pound or kg and is pure.

Candle wax may be beeswax or from some other source with possible corrosive

I'd start with the cheapest wax first (canning wax sold in bricks). Then
proof out an inexpensive encapsulated circuit.

Canning wax is meant to liquify in a double boiler, so it's melting point
is well below 100 C, probably only 60-70 C, so heat damage should be
minimal or non-existent.

Robert A. LaBudde, PhD, PAS, Dpl. ACAFS  e-mail:
Least Cost Formulations, Ltd.                   URL:
824 Timberlake Drive                            Tel: 757-467-0954
Virginia Beach, VA 23464-3239                   Fax: 757-467-2947

"Vere scire est per causae scire"


2000\03\25@142558 by Stephan Kotze

picon face

There is  a wax called "cavity wax" used in the automotive industry to
protect the cavities in between body panels of vehicles. It has a brownish
sticky texture due the the additional corrosion prevention additives in it.
You can get it in solvent diluted form or as a hot melt block.

Your local body shop should have some in stock


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