Genny and Lee,
Pre solder "Bake-out" has become SOP since the introduction of solder
reflow techniques. Note: I am not aware of any Polyamides that can
handle some of the higher reflow temps being specified by many OEMs, but
Hirose has many products that are successfully applied at 240-C to 245-C
all over the world. The generic 260-C will cause event the best
Polyamides to warp, or worse. The key here is the temp measured at the
board/component level, not ambient atmosphere.
I was going with 1946, myself, but pulled that out of thin air. :-)
Doug Erb
Senior FAE
Hirose USA
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Lee Whiteman
Sent: Wednesday, May 13, 2009 11:58 AM
To: [log in to unmask]
Subject: Re: [TN] Nylon connectors - moisture sensitivity
Genny,
Echoing Doug's statement (my boss delayed me again), I recently had a
colleague from a different site tell me that they bake out their
hardware at 85C-125C for over 1 hour to remove all moisture from nylon
connectors and fittings.
Lee Whiteman, PMP
Senior Member Engineering Staff
L-3 Communications East
Telephone: (856) 338-3508
FAX: (856) 338-2906
E-Mail: [log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Erb
Sent: Wednesday, May 13, 2009 2:50 PM
To: [log in to unmask]
Subject: Re: [TN] Nylon connectors - moisture sensitivity
Genny,
It depends upon the type of Nylon being used. In general Nylon is
hydroscopic and not a good choice for moisture rich environments. Some
of the new compounds that have improved heat resistance are also more
moisture resistant, but still can cause problems.
If you are concerned only about post solder wash, this should not be an
issue, but you should make certain that the assembly is thoroughly
dried. I hope that this helps.
Doug Erb
Senior FAE
Hirose USA
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Genny Gibbard
Sent: Wednesday, May 13, 2009 11:43 AM
To: [log in to unmask]
Subject: [TN] Nylon connectors - moisture sensitivity
We have been told that a surface mount nylon connector we use is
moisture sensitive, and should be treated as equivalent to level 5a.
This is the highest level we have ever seen on any component we have
used of any type. I didn't think that a connector could be moisture
sensitive. Not heat tolerant, yes - we have melted a few - but moisture
sensitive?
What kind of damage can happen to a nylon connector from too much
moisture absorption?
Thanks in advance for your responses.
Genny
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