Hi Folks,

A new version of the draft guidance (it's not a standard) was released a
couple weeks ago; we have a translation available of it for sale (sorry
Pearl) at www.chinarohs.com. 

There are several methods described for determining EFUP. The definition of
how to calculate "Techno-Life" has changed (as things are wont to do in
drafts, particularly China RoHS-related ones!). The use of MTBF for a
repairable product is improper for this (seemingly non-science-based)
concept of EFUP and would tend to result in a timeframe that is far too
short. It should be based on the designed use life of the product. 

From Draft 3 of the guidance doc:

5.2.3 Techno-life Method
If the product’s techno-life has been determined during the design stage and
environmental factors have been considered during the design stage as well,
then the following formula should be used to calculate the product’s
environment-friendly use period.

Environment-friendly use period = techno-life + difference

Note: The difference should include market life such as transportation and
storage prior to sales of products, and refurbished life for damaged but
repairable product’s life after repair, maintenance and parts replacement.

Mike

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