Hi all,

by the way: chromate layers have a thickness of round about 100 nm (due to
SurTec-info). RoHS recommends Cr6 to be less than 0.1% of weight of any
homogeneous material. A rough calculation shows that any alluminium sheet
with a thickness of more than 200 µm will meet that recommendation.
I think that not the presence of Cr6 or it's analysis will be a problem but
industry has to switch over to Cr3-chemistry because of no further
availability of the 'old' systems on the market.

Regards

Wolf-Dieter Schmidt
-----------------------------------------------------------
THALES Defence Deutschland GmbH
Industrial Engineering
Land & Joint Systems
Ostendstrasse 3
D-75175 Pforzheim - Germany
-----------------------------------------------------------
Phone: +49 7231 15 3386
Fax: +49 7231 15 3390
mailto: [log in to unmask]
http://www.thalesgroup.com



> -----Original Message-----
> From: Guenter Grossmann [mailto:[log in to unmask]] 
> Sent: Monday, May 22, 2006 9:42 AM
> To: [log in to unmask]
> Subject: [LF] Antw: Re: [LF] Cr(VI) Analysis - I have a question
> 
> 
> All
> 
> Just forget about separating the CrVI layer from ist surface. 
> The definition that a homogeneous material is a material that 
> can not mechanically be separated in further homogeneous 
> materials is a mnemonic (Joke for Werner: a donkey bridge). 
> It's to illustrate that the individual layer is addressed not 
> the entire piece which is coated. You can not weight the CrVI 
> layer but you know there is this layer and it is CRVI which 
> is banned that's it and you have to use CrIII instead. The 
> problem is to proof that the layer is CrVI if you are not 
> sure. Also that's possible. But forget any analysis on RoHS 
> compatibility on your own. It's prohibitively expensive and 
> work intensive. One can scratch at the surfe of the analysis 
> but an in depth analysis is a job for a well equipped lab and 
> a customer with a big (full) wallet.
> 
> 
> Best regards
> 
> Guenter
> 
> 
> 
> EMPA
> Swiss Federal Laboratories  for Materials Testing and 
> Research Centre for Reliability Guenter Grossmann,  Senior Engineer
> 
> 8600 Duebendorf
> Switzerland
> 
> Phone: xx41 1 823 4279
> Fax :     xx41 1 823 4054
> mail:     [log in to unmask]
> 

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