Colleagues,

Recently our material science lab evaluated 0402 surface mount lead-free
resistors from 10 major world resistor suppliers.  The specimens were
dissolved in aquaregia (3:1 hydrochloric:nitric acid) and the extract
examined using inductively coupled plasma mass spectroscopy.  6 of the 10
samples showed lead concentrations greater than 1000 ppm.  The explanation
from resistor suppliers is that the lead comes from the lead oxide resistive
element and not from the terminations, which is probably true.  But they
further state that this usage is in accordance with RoHS legislation.  Would
any readers here be able to explain what RoHS Annex exemption applies to the
resistive elements of common resistors?

Thanks and regards,

Bill Haas

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