Doug et al,

Is there a disagreement in the industry as to what minimum thickness of urethane is required in order to mitigate tin whisker concerns?

I am hearing that the .003+/-.002" does not provide enough of a minimum thickness and that the number is as high as .004".   I can understand wanting the minimum being raised to .002" but higher than that would seem to make the process much more difficult to control.

I have a potential customer asking if we measure the thickness on the individual component leads which is another can of worms it seems.  We always used flat samples to document our thicknesses.

I did not get to attend this years APEX so I might have missed the latest data.
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