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'Potting a PIC'
1997\11\27@081452 by Dave Celsnak

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Sorry for my dual posts,  just splitting up the questions:

Can anyone tell me if they have had any success using potting epoxy?
Any good suppliers?  Will any high di-electric plastic work?


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1997\11\27@192428 by Andy Kunz

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At 08:13 AM 11/27/97 -0500, you wrote:
>Sorry for my dual posts,  just splitting up the questions:
>
>Can anyone tell me if they have had any success using potting epoxy?
>Any good suppliers?  Will any high di-electric plastic work?

I use the 3M stuff available from Newark Electronics on my water-proof
electronic speed controls.  Either black or clear works fine.

Andy

==================================================================
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
         Hardware & Software for Industry & R/C Hobbies
       "Go fast, turn right, and keep the wet side down!"
==================================================================

1997\11\29@064850 by Luis Fernandez

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>>Can anyone tell me if they have had any success using potting epoxy?
>>Any good suppliers?  Will any high di-electric plastic work?
>
>I use the 3M stuff available from Newark Electronics on my water-proof
>electronic speed controls.  Either black or clear works fine.

Does 3M makes any solderable barnish ?. I use it to make PCB water-tolerant
(not water-proof). The barnish lets you make reworks on the PCB, change
cables, etc. Connectors that fits directly in the PCB can be soldered after
barnish application (jack connectors, etc). They would probably get locked
if using epoxy.

Have found this stuff in spray, but would prefer to use it liquid like any
wood barnish. Anybody knows who makes it ?


Luis Fernandez Cormenzana
RadioBit Sistemas, S.L.
       Vehicle fleet control systems
       Patrol presence controllers

Fax/Tel:+34-6-585 64 57
       +34-6-680 26 33
e-mail: spam_OUTradiobitTakeThisOuTspamdragonet.es
http://www.dragonet.es/users/radiobit

1997\11\29@164700 by Andy Kunz

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>Does 3M makes any solderable barnish ?. I use it to make PCB water-tolerant
>(not water-proof). The barnish lets you make reworks on the PCB, change
>cables, etc. Connectors that fits directly in the PCB can be soldered after
>barnish application (jack connectors, etc). They would probably get locked
>if using epoxy.
>
>Have found this stuff in spray, but would prefer to use it liquid like any
>wood barnish. Anybody knows who makes it ?

I believe Luis means "varnish."

I don't know of solder solderable varnishes.  The 3M potting compound I use
is NOT solderable afterwards - it melts and smells.  It is, however,
removable sufficiently for me to replace damaged components (heat) underneath.

Andy

==================================================================
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
         Hardware & Software for Industry & R/C Hobbies
       "Go fast, turn right, and keep the wet side down!"
==================================================================

1997\11\30@045831 by Leon Heller

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In message <.....3.0.1.32.19971129164209.0069571cKILLspamspam@spam@pop.fast.net>, Andy Kunz
<montanaspamKILLspamFAST.NET> writes
>>Does 3M makes any solderable barnish ?. I use it to make PCB water-tolerant
>>(not water-proof). The barnish lets you make reworks on the PCB, change
>>cables, etc. Connectors that fits directly in the PCB can be soldered after
>>barnish application (jack connectors, etc). They would probably get locked
>>if using epoxy.
>>
>>Have found this stuff in spray, but would prefer to use it liquid like any
>>wood barnish. Anybody knows who makes it ?
>
>I believe Luis means "varnish."
>
>I don't know of solder solderable varnishes.  The 3M potting compound I use
>is NOT solderable afterwards - it melts and smells.  It is, however,
>removable sufficiently for me to replace damaged components (heat) underneath.

Solder-through varnish is made! I've got an aerosol can of it, made by
Electrolube, called Clear Protective Lacquer (CPL). I think that Luis is
after it in ordinary liquid form, rather than an aerosol.

Leon
--
Leon Heller: .....leonKILLspamspam.....lfheller.demon.co.uk http://www.lfheller.demon.co.uk
Amateur Radio Callsign G1HSM    Tel: +44 (0) 118 947 1424
See http://www.lfheller.demon.co.uk/rcm.htm for details of a
low-cost reconfigurable computing module using the XC6216 FPGA

1997\11\30@135110 by Adrian Gothard

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At 07:54 30/11/97 +0000, you wrote:
>In message <EraseME3.0.1.32.19971129164209.0069571cspam_OUTspamTakeThisOuTpop.fast.net>, Andy Kunz
><montanaspamspam_OUTFAST.NET> writes
>>>Does 3M makes any solderable barnish ?. I use it to make PCB water-tolerant
>>>(not water-proof). The barnish lets you make reworks on the PCB, change
>>>cables, etc. Connectors that fits directly in the PCB can be soldered after
>>>barnish application (jack connectors, etc). They would probably get locked
>>>if using epoxy.
>>>
>>>Have found this stuff in spray, but would prefer to use it liquid like any
>>>wood barnish. Anybody knows who makes it ?
>>
>>I believe Luis means "varnish."
>>
>>I don't know of solder solderable varnishes.  The 3M potting compound I use
>>is NOT solderable afterwards - it melts and smells.  It is, however,
>>removable sufficiently for me to replace damaged components (heat)
underneath.
{Quote hidden}

Out of interest, are we talking "conformal coating" here?

Adrian

WWW    WWW Adrian Gothard
WWW WW WWW White Horse Design
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'Potting a PIC'
1997\12\01@052409 by Leon Heller
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In message <RemoveME3.0.3.16.19971130161040.505710a6TakeThisOuTspamzetnet.co.uk>, Adrian
Gothard <spamBeGonewhdspamBeGonespamZETNET.CO.UK> writes
{Quote hidden}

No, it's different. I've also got a can of Electrolube HPA Conformal
Coating.

Leon
--
Leon Heller: EraseMEleonspamlfheller.demon.co.uk http://www.lfheller.demon.co.uk
Amateur Radio Callsign G1HSM    Tel: +44 (0) 118 947 1424
See http://www.lfheller.demon.co.uk/rcm.htm for details of a
low-cost reconfigurable computing module using the XC6216 FPGA

1997\12\01@125247 by Engineering Department
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> Can anyone tell me if they have had any success using potting epoxy?
> Any good suppliers?  Will any high di-electric plastic work?

I've used Devcon Flexane (TM) 94 liquid 15250 with good luck.
The stuff is a two part urethane available in the US at
industrial supply and industrial plastics houses.

Black. Opaque and seems not to screw up 4Mhz resonators.

It works well in molds, just use some liquid floor wax on the
mold halves to prevent adhesion.

Cheers,

Win Wiencke
Image Logic Corporation
RemoveMEImageLogicEraseMEspamEraseMEibm.net

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