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What does wt% used in A2 and in Lead-Free Semiconductor Products means?

Latest Updated:06/01/2007

Question:

What does the symbol "wt%" used in A2 above and in the Lead-Free Semiconductor Products pamphlet mean?

Answer:

This symbol refers to the unit "weight per cent".
For example, "Sn-3Ag-0.5Cu" means Sn-Ag-Cu with Ag of 3wt% and Cu of 0.5wt%.
In the pamphlet, the maximum allowable amount according to the RoHS directive is indicated by the unit "ppm" (part per million: 1/1,000,000); however, this has the same meaning as "weight per cent". In other words, 1000 ppm = 0.1wt%.
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