We use a semi-aqueous process with final water rinse followed by IPA spray
and then bake 30 minutes at 150 deg. F.  Later, we dry out further with 6 hr
vac bake at 200 deg. F prior to conformal coating all our polyamide boards.

 Rainer G. Blomberg
 Honeywell -Space Systems Clearwater
 Staff Production Engineer
 13350 US Hwy 19 N MS 802-3
 Clearwater, FL 33764-7290
(727) 539-5534 Phone
(727) 790-8738 Pager
(727) 539-4469 Fax
e-mail: [log in to unmask]



-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Friday, January 18, 2002 4:04 PM
To: [log in to unmask]
Subject: [TN] Baking of Assemblies?


This should be good fodder! We wash PWAs in a water hurricane type machine,
with
a hot air blower at the end of cycle. We noticed some components mainly
elect.
alum. capacitors have high capacitance. After research on cap. we were
instructed to bake assemblies 20 mins @ 100c to dry them. The long term
effect
of the moisture in the cap would cause electrical leakage then failure due
to
corrosion.
Well this idea expanded into a question should we bake all assemblies
because
many other items such as transformers, pots., coils are not hermetically
sealed.
And then there is the issue with pwb material its self.

My question to the forum is, Does anyone bake after wash as a standard? All
points of view are welcome.

Thanks!

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