[Elecraft] Fwd: OT: tin whiskers videos

[Damon - KC5CQW]

Oh no what shall we ever do!

    In the aerospace industry, we use "conformal coatings". On one of the
jobs I did, Humiseal was used.
It was a spray can of an acrylic formulation that could be removed with
acetone if rework is needed.
This is desirable because the others are not removable without a hammer and
chisel!
Humiseal also has an "optical enhancer". It is very visible under a UV lamp. 
That way it is easy to tell if the pc board is coated corectly or if the
Humiseal was removed completely.

     Note: Humiseal WILL CLOG A VACUUM SOLDER SUCKER!!! Not that I know from
experience or anything... Be sure to remove it completely in case of rework.
If used, be sure to mask off all connectors, pots and other variable
what-knots. 
This stuff will ALMOST make the PC board water-proof. Avionics have to pass
many environmental tests before shipping to the customer. This includes
<-30deg F with condensation, i.e., frost. 

     So why would I post this in a topic about tin whiskers? Because I've
NEVER seen a PC board with tin whiskers that was conformally coated! I may
be wrong but, this is my observation.

I have nothing to do with Humiseal, tin, solder or PC board industries or
companies...






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Damon Wascom KC5CQW
Elecraft K2 #:6351
Build: 12/28/07-01/01/08


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