Hmmmmmmmmm,

Anti-static pink bags and foam for electronics use used to be manufactured
by coating (or actually blooming) the material with amines. The way that
they work is that the amines are hydrophilic and work by attracting
moisture.

Most anti static products these days are amine free - you might want to
check.

Most problems with this that I recall from about 15 - 20 years ago is that
if the board is placed in contact with one of these bags or foam  before
conformal coating it can impact the cure schedule, presumably due to the
board coming into contact with a moisture loaded amine surface.

More than that I cannot recall but I am sure Mike Fenner will enlighten us
when Europe wakes up

John Burke
(408) 515 4992

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joe Macko
Sent: Tuesday, January 06, 2009 2:58 PM
To: [log in to unmask]
Subject: [TN] Potential contamination from pink colored antistatic foam

Hi All.

 

My question is related to a comment one of our CMs recently made about
not allowing populated/soldered boards to come in direct contact with
pink colored antistatic foam for extended periods of time. This CM was
notified by another customer that they observed discoloration of solder
joints, solderability issues and /or conformal coat adhesion problems
after ~ 90 days due probably to either out gassing and/or a chemical
reaction with the ant-stat chemicals used in the foam. At one time I did
hear about N'octonic acid (not sure of spelling) in pink poly static
bags causing problems but have not heard anything recently.

 

Has anyone heard of or experienced such issues with the use of such
material as pink colored antistatic foam?  Is there a safe anti-stat
foam that does not have these issues/concerns?  Is there a mil spec or
some other industry type spec that regulates the type of anti-stat
material used with electronics?  thanks

 

Best Regards,

-Joe

 


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