[ARC5] Tropical Coating

[KG4ERX]

My business is rebuilding electric utility control equipment, one 
manufacturer used a conformal coating that looks very similar to the MFP, 
and yes, it does clog desoldering equipment!  This mfr got away from it and 
went to a silicone resin type coating in the late 70's.

Shew
KG4ERX


----- Original Message ----- 
From: <WA5CAB at cs.com>
To: <arc5 at mailman.qth.net>
Sent: Sunday, February 21, 2010 11:25 AM
Subject: Re: [ARC5] Tropical Coating


> Yes.  At least in the generic sense.  I don't recall ever coming across a
> document giving the actual chemical composition.  I did once track down a
> source of solvent for it, but cost versus minimum order quantity versus 
> shelf
> life resulted in no purchase being made.  But it is Moisture and Fungus
> Proofing varnish.  Developemt began after the invasion of Guadalcanal and 
> because
> of limited availability, until roughly mid-1944 its use was restricted to
> items going to the PTO and CBI.  If you look around the outside of the
> receiver, you should see a stamp saying "MFP", and maybe a date.
>
> It is relatively brittle (at least 60-70 years on).  It should be removed
> from solder joints before doing any parts replacement.  I can attest that 
> it
> clogs up de-soldering equipment.
>
> In a message dated 2/21/2010 10:10:21 AM Central Standard Time,
> hyperlabs at aol.com writes:
>> My BC-454 has (what I surmise to be) a tropical coating on the internal
>> underside wiring and components. It's slightly yellowish and has a kind 
>> of
>> resinous fragrance when the unit is warm. Does anyone know what this
>> material is? Looks quite effective...
>>
>> Jim
>> N3ZJ
>
> Robert & Susan Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
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