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| Date: | Sat, 14 Jun 1997 23:16:39 -0700 |
| Content-Type: | text/plain |
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Hi, All
I see a lot of message abour LPI stripping and wonder what about thermal cured soldermask which is much more difficult to be stripped than UV ink. Is there any chemical avaiable for that? Does this fact imply chemical and thermal resistance of thermal cured ink is actually better than LPI ink. LPI just has better resolution.
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From: [log in to unmask][SMTP:[log in to unmask]]
Sent: Saturday, June 14, 1997 5:55 PM
To: [log in to unmask]
Subject: Re: Re[2]: LPISM Stripping
I'm not sure if it has tremendously improved over the past two years;
however, most PWB shops will try to strip LPI masks (even after final cure)
in preference to scrapping out the boards.
The basic requirements for stripping cured LPI solder masks after final cure
are:
1. High pH (>13.0)
2. High temperature (150-180 deg F)
3. Patience (it could take up to 48 hours)
A number of companies have proprietary solder mask strippers on the market
which work well. Examples would include: Alpha Metals, Oliver Sales, Dexter
Electronic Materials, etc.
Hope this helps
Larry Fisher
Dexter Electronic Materials
[log in to unmask]
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