Hi all,
I have an intermittent problem with a latex soldermask applied by bare
board suppliers.  On some batches the product will smoke slightly during
reflow in nitrogen, others are fine.  Unfortunately addition of the mask
was arranged by purchasing with process left to the vendor's discretion
(this will be corrected).  What differences in materials, chemistry, etc.
contribute to more or less stable and heat resistant masks?  Does anyone
have a specification they could share to insure latex mask is properly
applied, cured etc.?
Thanks in advance.
Brad Vanderhoof
Please don't try to sell me a new reflow oven over this forum.

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