Hey Paul !

at last ! somebody with a decent name ; gettin' sick of this "Steve's"
litanies & shirades :
We've got saints, popes, kings, prime ministers and God knows (forbid?) who
else in our ranks :
this new age upstarting tryhards are really tiresome ; ain't they ?
"Steve's" ; my foot 

On to The high tech subject : non contact kiss (yes ; don't worry; it does
stand for keep it ss) :
What about capping the socket with a chewing gum ?
Ok ; if yo' bit squeamish yo' can use industrial latex .
If yo' get the viscosity right (Alpha Stop ; Multicore's Spot On ; etc. ) :
dip the tops in dish ( don't turn ! ) ; place them still upside down on cut
film tape bits ( you can drive the beancounters up the walls if you use the
very handy and expensive Kapton tape ; if not, use your brilliant Sunday's
shoots : Kodak's 35,16, 8 [flat , not scrolling {iron pull}]or whatever non
digital yo' lay hands on ) ;
let them dry overnight in tray ; and let me know than if I'm blabbing
dreamer or a decent practitioner .
With this film on you can even place them with P&P tool . 
You may peel it when yo' finish ; obvious  ?


That is only if you pot without vacuum (which you don't need in your
application) :
>>> the raising compound should hit the trapped air .

Good luck mate                         paul



> ----------
> From:         Paul Wareham[SMTP:[log in to unmask]]
> Sent:         Friday, 19 February 1999 11:13
> To:   [log in to unmask]
> Subject:      [TN] Sealing sockets prior to potting.
> 
> We've got a real problem with one product where we use potting compound to
> encapsulate a PCB assembly.  The PCB has a few relay sockets which have
> some openings at the bottom of the socket - not sealed.  When we pour our
> potting compound into the unit, the potting creeps up the connection pins
> into the connector body itself which really fouls up our ability to plug
> in the relay.  
>  
> Getting the sockets sealed at the factory is not easy - big minimum order
> and very costly.  We've tried a two stage potting procedure where we pot
> only part way until the potting reaches the level of the socket - then let
> it set, then pot the rest of the way.  This works to some degree but with
> mixed results.  
>  
> We were thinking of sealing the bottom openings with a peelable solder
> mask (Alpha Solder Stop 110) but some here were conerned that this could
> adversly effect the tin plated brass pins on the socket or the solder
> joints themselves.
>  
> Has anyone else ever run into a similar problem?  Anyone think of anything
> to try in order to help this situation?
> 

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