Charlie: Things to consider to better answer the question:

1. Is the problem on both sides of the board or just the wavesolder side?

2. Are the boards from the same or different dates/builds from the bare
board fabricator?

3. Do these boards get both a thermal and U/V cure from the fabricator?

4. If you run a non-wavesoldered board (if possible from the same fab date)
thru the wash do you see the same effect?

5. 3 Ft/min thru wavesolder is pretty slow, depending on your preheat. Can
you check on top/bottom side max temps prior to hitting the solderwave?


I would guess that possibly the soldermask was not properly cured and the
flux and heat in wavesolder may be reacting with it in addition to your wash
chemistry finally pushing it over the top.



Regards

Michael Barmuta

Staff Engineer

Fluke Corp.

Everett WA

425-446-6076




-----Original Message-----
From: Charlie Pitarys [mailto:[log in to unmask]]
Sent: Wednesday, April 30, 2003 6:50 AM
To: [log in to unmask]
Subject: [TN] Intermittent solder mask problems, again.



Can anyone share process issues with Enthone solder mask? The customer has
used my saponifier for just over a year with no issue like this.

Flux used is Alpha RF800  (foam fluxer) pre-heat at 225 F and solder pot at
490 F  w a conveyor speed of 3 ft / min,

Saponifier  wash concentration was 10 %, temp at 120F, for 10 mins. Solder
mask used is Enthone DSI 41G.

Please explain on a batch of 50 boards, 5 were perfect, 5 were very bad with

solder mask peeling, and 40 in the middle with minimal fading.

 All the processes were the same for all, all sat for 1-2 days after wave
solder.

Where the board was masked for secondary attachment ( mask removed prior to
clean) and also shadowed by the wave fingers there is no changing of the
overall green color.

If the wash chemistry is the culprit then it would affect every board and in
a uniform fashion. I have photos to share, maybe Steve G.  will let me post
them on his sight?

My suspicions are, incorrect cure, application etc. of the Enthone mask.

Thanks in advance.



Charlie Pitarys
Director of Application Technologies
603.622.2900 X-115
www.kyzen.com <http://www.kyzen.com/>






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