if you do a little google trawling on Cr+6 and SS you'll find ther's quite a lot of work been done on exposure to Cr+6 for workers in the SS arena especially in the USA - OSHA. There are also fairly simple detection methods for Cr+6 which you'll find detailed there too - so don't be so sceptical :)
C
-----Original Message-----
From: Leadfree on behalf of David D. Hillman
Sent: Fri 15/04/2005 17:22
To: [log in to unmask]
Cc:
Subject: Re: [LF] Stainless steel.
Hi Chris - It would be quite interesting to see the analysis technique,
sampling method, and method measurement tolerance on determining the
"amount" of Cr+6 in a cutting or welding situation. As other LeadNetees
have discussed, the analytical methodology to confirm the RoHS material
presence/quantity is embarrassingly poorly prescribed.
Dave
"James, Chris"
<[log in to unmask]>
To
04/15/2005 11:07 <[log in to unmask]>,
AM <[log in to unmask]>
cc
Subject
RE: [LF] Stainless steel.
Dave - the current thread is stainless steel not conversion coatings of
which I am fully aware about.
The point I was getting across is that stainless only contains chromium
but will produce Cr6 if flame cut, welded etc. Other forum members
seemed to be under the impression SS contains Cr+6.
FYI Atotech claim to have compliant high performance post treatment
sealers - see:
http://www.atotech.com/start.php3?cl_my_id=695663
Regards,
Chris
____________
-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: 15 April 2005 16:52
To: [log in to unmask]; James, Chris
Subject: Re: [LF] Stainless steel.
Hi Chris - the chromium in stainless steel is metallic chromium and not
included in the RoHS Directive. There are chemical conversion coatings
that
contain hexavalent chromium (e.g. materials such as Alodine) that are
applied ON metallic surfaces for improved corrosion resistance. Those
conversion coatings would be included in the RoHS Directive. This is a
major issue for the high performance segment - there are no substitute
conversion coatings that provide equivalent corrosion resistance
characteristics (and folks, please don't flame me - I have seen the
vendor's marketing literature on "we have substitutes" but when we
tested
we could not produce adequate results for our use environments).
Dave Hillman
Rockwell Collins
[log in to unmask]
"James, Chris"
<[log in to unmask]>
Sent by: Leadfree
To
<[log in to unmask] [log in to unmask]
>
cc
Subject
04/15/2005 10:20 Re: [LF] Stainless steel.
AM
Please respond to
"(Leadfree
Electronics
Assembly Forum)"
<[log in to unmask]
>; Please respond
to
"James, Chris"
<[log in to unmask]>
As I understand it stainless steel is basically an alloy of iron, carbon
and chromium (minimum of 10.5%) and when cut, heated, welded or corroded
can give off Cr6, but not that it is inherently contained in the
stainless.
Any metallurgists out there..................???
http://www.chromium-asoc.com/publications/crfile9apr02.htm
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&lis
t_uids=7622548&dopt=Abstract
Regards,
Chris
____________
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Smith, Rick
Sent: 15 April 2005 15:35
To: [log in to unmask]
Subject: Re: [LF] Stainless steel.
Robert are YOU SURE?
We have been told to specify suppliers who use Chromium III and avoid
those who use Chromium VI in their process.
Also the word is that the SS with Chromium III will rust.
Rick Smith
Senior Product/ Component Engineer
ClearCube Technology
8834 Capital of Texas Highway North
Austin, TX 78759
Phone: (512)652-3544
Cell: (512)299-6925
Fax: (512)652-3545
[log in to unmask]
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Hilty, Robert D
Sent: Thursday, April 14, 2005 12:16 PM
To: [log in to unmask]
Subject: Re: [LF] Stainless steel.
There is no impact. Stainless steel does not include any hexavalent
chromium.
Cheers,
Bob Hilty, Tyco Electronics
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Denis Ryskamp
Sent: Thursday, April 14, 2005 12:58 PM
To: [log in to unmask]
Subject: Re: [LF] Stainless steel.
We have been reviewing materials used in our products and a question
arose
regarding Chromium used in Stainless steel. (301, 302, 303)(BSI 1449
Part 2
301S21, 302S25) What impact does RoHS have on this material? Cr is one
of
the elements used to give the material its characteristics. Cr6 is given
off
when these steels are processed, welded, etc.
Denis
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