Hi Wolf-Dieter, Guenter, IPC LF Listservers,

<A rough calculation shows that any alluminium sheet
with a thickness of more than 200 µm will meet that recommendation.>

Wolf-D, you can't do the calculation this way if you wish to comply with
the EU's homogeneous definition and examples.  Any surface treatment ALL
BY itself has to be less than 100ppm of Cr-IV using penetration depth as
one of the terms in the equation.

If it is in the bulk material itself then you can do the calculation you
have suggested.

Yours in Engineering, Dave
YiEngr, MA/NY DDave

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