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Reply To: | TechNet E-Mail Forum. |
Date: | Wed, 27 Jan 1999 11:06:08 -0500 |
Content-Type: | text/plain |
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Hello Netters,
I just got through digging in the TechNet archives, now I need some more
info.
I have a PCB, (thru hole) that has a white appearance on the solder side,
and white spots on component side. My findings in the archive suggest that
it may be uncured solder mask.
I have tried the suggestion of using hot air/ soldering gun and heating the
solder mask to see if white disappears, which it does.
I do not have any metheleyne chloride, so the other test I can not perform,
is there another? I have tried hand washing PCB in IPA to see if white
appearance may be surface residues, has no effect.
I would like to know if there is anyone who has a similar problem? My
interpretation of the archives were that it was random white areas, mine
appears over entire PCB.
Process Parameters:
1. Wave solder with Kester OA 2331-ZX flux
2. Wave temp 205-215 until 490F wave
3. Conveyor speed 4.5ft/min
4. Wash cycle 8min at 145-160F DI water no chemical]
5. 3 rinse cycle at 1min each at 145F
Thanks in advance
Tom B
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