Subject: | |
From: | |
Reply To: | (Leadfree Electronics Assembly Forum) |
Date: | Mon, 22 May 2006 10:03:08 +0200 |
Content-Type: | text/plain |
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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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