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conformal coating over inspection stamps

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#82022

conformal coating over inspection stamps | 18 February, 2019

Has anyone found a durable, indelible inspection stamp ink?

We have an extreme case of smearing/obliteration because we have the boards dip coated (Humiseal 1B73).

The manufacturer of our stamps is zero help, i.e., the best I could get out of them was "I don't know if we have a ink that will withstand what you are doing" after 3 emails.

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SMTA-Joe

#82036

conformal coating over inspection stamps | 19 February, 2019

I have seen this issue with manufacturer markings stamped on PCBs. The ink just melts away as soon as CC touches it.

This message was posted via the Electronics Forum @ SMTASMTA

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#82037

conformal coating over inspection stamps | 19 February, 2019

I figured it was just going to take a little searching to find a (more expensive) stamp that used an (more expensive) indelible ink. Not the case. Just can't find anything at all, and the stamp manufacturers say not to use any ink but what they provide or the stamps will degrade. I don't know how much truth there is to that but I don't want to destroy any of our inspection stamps just to find out.

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