Henry,
If the solder mask is qualified to IPC-SM-840, the vendor is only allowed a
very small window of formulation "fiddling" before he has to requalify as a
new mask formulation.  For what we have done so far, most high quality
masks will pass lead free as well.  I suspect that peeling solder mask has
more to do with changes in pre-mask cleanliness at the fabrication site
than in formulation changes by the mask vendors.

Doug Pauls




             Henry Rekers
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             08/19/2005 02:55          [TN] Soldermask
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               Henry Rekers
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Has anybody out there had issues with peeling solder mask after wave
soldering lately?  It seems that some of the mask vendors are changing
their formulations for RoHS.

Henry J. Rekers B. Eng
Senior Manufacturing Engineer
Power Measurement
Tel: 1-250-652-7100  ext. 7510
Fax: 1-250-652-7107
E-Mail: < mailto:[log in to unmask]>
Website: < http://www.pwrm.com/>

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