Hi Barry,

Is the white appearance in or on the laminate?

Are we talking a mechanical defect in the material or a
residue/contamination?

Does it change if you press on the affected area? (blisters)

Send me a pic (off-list of course) and I'll run it around our shop if ya
want.

Need more info.

Hans
~~~~~~~~~~~~~~~~~~~
Hans M. Hinners
Materials (Process & Manufacturing) Engineer
Warner Robins Air Logistics Center
Avionics Production Division
Manufacturing Branch
380 Second Street, Suite 104
Building: 640, Mail Stop: LYPME
Robins AFB, GA 31098-1638
Voice: (912) 926 - 1970 Fax: (912) 926 - 7164
mailto:[log in to unmask] <mailto:[log in to unmask]>
http://www.robins.af.mil <http://www.robins.af.mil/>
-----Original Message-----
From: Barry Gallegos [mailto:[log in to unmask]]
Sent: Thursday, June 08, 2000 2:14 PM
To: [log in to unmask]
Subject: [TN] Laminate condition


Dear Sirs, Madams, Guru's.

I have an assembly that we processed thru SMT and then thru the wave solder
operations. Wave solder flux was with Alpha metals 856 water-soluble. The
assembly is exhibiting a white cloudy / milky appearance that looks almost
as if the laminate/solder mask has changed color. No matter how much we wash
this assembly, it will not go away.

Is this due to possible moisture in, around or under the solder mask /
laminate. What is it and  is it acceptable.


Any advice would be appreciated.



Yours truly, (wana-be guru.)

Barry Gallegos
Western Electronics.
208-377-1557