AVR-Chat

Re non-conducting grease.   Why non-conducting on something you want to
conduct?    If you do some googling you will find it somewhat of a
controversy as to whether or not you should put a dielectric (i.e.,
non-conducting) corrosion protection on connector pins.

 

Chemtronics makes an electrically conductive grease but it is incredibly
expensive per unit weight (Digi-Key sells it).   Instead I use "NO-OX-ID
A-Special" from Sanchem, which is much more reasonably priced, on all my
boat connections that are exposed to the elements.   

 

http://www.sanchem.com/aSpecialE.html

 

Being conductive you don't want it to short out adjacent pins, so be careful
applying it!      The technique I use depends on the connector.    Sometimes
I'll use both this grease and an anti-corrosion spray, for example, on wires
going into a Eurostyle terminal block I'll poke the bare wire end into the
grease, screw it in place and then spray anti-corrosion stuff over the
completed terminal block.

 

Steve

 

 

From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf
Of Chuck Hackett
Sent: Saturday, October 02, 2010 7:27 AM
To: AVR-Chat
Subject: [AVR-Chat] PCB Coating

 

  

I am looking for a Conformal Coating/Potting Compound that I can coat boards
with to
protect them from moisture that can be removed (component-safe solvent?) to
do
repairs.

The boards will have SMT, through-hole as well as DB-25, jumper pins,
headers, etc.
Obviously I'd protect the DB-25, jumper pins, headers, etc. during the
coating
process.

I have found "Techspray 2108-12S" $21 spray can at Mouser that says it can
be easily
removed for rework. Is this a cost effective approach?

Spray, brush, or dip would be fine with me.

BTW: I am planning on coating the DB-25, headers, etc. (i.e.: connecting
pins) with
a non-conducting grease, etc. to protect them from moisture in the field.
 
Cheers,

Chuck Hackett
"Good judgment comes from experience, experience comes from bad judgment"
7.5" gauge Union Pacific Northern (4-8-4) 844
http://www.whitetrout.net/Chuck





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