Sounds like you too would like some thought put into these legislative
actions Bev................8-)
John
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Bev Christian
Sent: Friday, May 19, 2006 1:25 PM
To: [log in to unmask]
Subject: Re: [LF] Cr(VI) Analysis - I have a question
See this is the thing I hate about the super-greenies - they never work
things through to look at the total consequences of what they are
advocating. A prime example is paper vs. plastic bags.
Bev
RIM
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Arnold Offner
Sent: May 19, 2006 4:21 PM
To: [log in to unmask]
Subject: Re: [LF] Cr(VI) Analysis - I have a question
Hi Everyone,
The idea behind the mechanical removal of material is based on the
concept
of using a non-chemical related step in separating the materials that
make
up a part.
What would one do with the corrosive and possibly environmentally
harmful
waste created by such a step ?
Kindest regards,
Arnold Offner
Phoenix Contact Inc. - USA
Industry Associations & Committees
Program Lead - RoHS & WEEE Directive
Box 4100
Harrisburg, PA 17111-0100
United States of America
Telephone: USA - 717 - 948 3469
Cellphone: USA - 717 - 215 0155
Facsimile: USA - 717 - 944 1625
E-Mail: <[log in to unmask]>
"John R. Sieber"
<john.sieber@NIST
.GOV>
To
Sent by: Leadfree [log in to unmask]
<[log in to unmask]
cc
>
Subject
Re: [LF] Cr(VI) Analysis - I have
a
05/19/2006 12:48 question
PM
Please respond to
"(Leadfree
Electronics
Assembly Forum)"
<[log in to unmask]
>; Please respond
to
"John R. Sieber"
<john.sieber@NIST
.GOV>
What is the criterion for successful removal of a layer by grinding
so that one can test its composition? I'd like to see someone
demonstrate the removal of a chromate layer of 10 nm to 100 nm
thickness without contaminating it or changing its chemical composition.
People are challenging the statement that layers must be consider
homogeneous substances because they can, in principle, be disjointed
by grinding. Sure you can remove it, but is that really
"disjointing" if the layer is destroyed in the process?
John Sieber
NIST
At 03:33 PM 5/18/2006, Davy, Gordon wrote:
>Bev Christian has raised the question of how to determine the ppm level
>of chromium that he finds on a component, since he doesn't know the
>weight, thickness, or density of the layer that has the Cr. He refers
to
>a colorimetric test. The color of a Cr-bearing coating on, for example,
>aluminum sheet metal, might be used to distinguish between Cr (VI) from
>any other form of Cr. The only method that I can think of that could be
>used to establish the oxidation state of Cr in a coating is ESCA, and
>that would be totally impractical. If Cr (VI) is found, then it must be
>assumed that the amount present in the coating layer itself (which
>could, of course, be removed by grinding and is therefore homogeneous)
>is more than 0.1 percent.
>
>But what to do if the Cr is found below the surface, for example below
a
>layer of paint? X-ray fluorescence can find the Cr, but it can't tell
>one oxidation state from another. The Cr in this coating might be
>present as conventional chromate, or it might be present as a permitted
>chromium-bearing substitute (i.e., Cr(III)). I can think of no
>practical way to way apply colorimetry or any other method to an
>underlayer alone.
>
>Here's another way of coming at it. If you can't determine the
oxidation
>state of a buried coating, then neither can anyone else. The reason for
>being concerned about the presence of Cr in the first place is that an
>enforcement agency might find it and claim that it is Cr(VI). Can an
>enforcement agency on the basis of a suspicion impound hardware or
issue
>monetary penalties until conformance is established to their
>satisfaction? Perhaps. Europeans seem willing to do some pretty strange
>things. But is it likely? Take into account the overwhelming number of
>manifest noncompliances that the agencies will surely be dealing with
>for the foreseeable future. What is the probability that a penalty for
>use of Cr(VI) would be imposed on the basis of a suspicion? How high on
>your list of concerns is this, anyway?
>
>
>
>Gordon Davy
>
>Baltimore, MD
>
>
>-----------------------------------------------------------------------
--------Leadfee
>Mail List provided as a service by IPC using LISTSERV 1.8d
>To unsubscribe, send a message to [log in to unmask] with following text
in
>the BODY (NOT the subject field): SIGNOFF Leadfree
>To temporarily stop/(start) delivery of Leadree for vacation breaks
>send: SET Leadfree NOMAIL/(MAIL)
>Search previous postings at: http://listserv.ipc.org/archives
>Please visit IPC web site
>http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional
>information, or contact Keach Sasamori at [log in to unmask] or
>847-615-7100 ext.2815
>-----------------------------------------------------------------------
--------
John R. Sieber, PhD
Research Chemist
National Institute of Standards and Technology
Chemical Science and Technology Laboratory
Analytical Chemistry Division
100 Bureau Drive, Stop 8391
Gaithersburg, MD 20899-8391 USA
[log in to unmask]
Tel: 1.301.975.3920
Fax: 1.301.869.0413
www.cstl.nist.gov/
Identification of commercial items in this document does
not imply endorsement by NIST or that items are
------------------------------------------------------------------------
-------Leadfee
Mail List provided as a service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text
in
the BODY (NOT the subject field): SIGNOFF Leadfree
To temporarily stop/(start) delivery of Leadree for vacation breaks
send:
SET Leadfree NOMAIL/(MAIL)
Search previous postings at: http://listserv.ipc.org/archives
Please visit IPC web site
http://www.ipc.org/contentpage.asp?Pageid=4.3.16
for additional information, or contact Keach Sasamori at [log in to unmask]
or
847-615-7100 ext.2815
------------------------------------------------------------------------
-------
necessarily the best for the purpose stated.
------------------------------------------------------------------------
-------Leadfee Mail List provided as a service by IPC using LISTSERV
1.8d
To unsubscribe, send a message to [log in to unmask] with following text
in
the BODY (NOT the subject field): SIGNOFF Leadfree
To temporarily stop/(start) delivery of Leadree for vacation breaks
send: SET Leadfree NOMAIL/(MAIL)
Search previous postings at: http://listserv.ipc.org/archives
Please visit IPC web site
http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
ext.2815
------------------------------------------------------------------------
-------
---------------------------------------------------------------------
This transmission (including any attachments) may contain confidential
information, privileged material (including material protected by the
solicitor-client or other applicable privileges), or constitute non-public
information. Any use of this information by anyone other than the intended
recipient is prohibited. If you have received this transmission in error,
please immediately reply to the sender and delete this information from your
system. Use, dissemination, distribution, or reproduction of this
transmission by unintended recipients is not authorized and may be unlawful.
----------------------------------------------------------------------------
---Leadfee Mail List provided as a service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Leadfree
To temporarily stop/(start) delivery of Leadree for vacation breaks send:
SET Leadfree NOMAIL/(MAIL)
Search previous postings at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16
for additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
----------------------------------------------------------------------------
---
-------------------------------------------------------------------------------Leadfee Mail List provided as a service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Leadfree
To temporarily stop/(start) delivery of Leadree for vacation breaks send: SET Leadfree NOMAIL/(MAIL)
Search previous postings at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-------------------------------------------------------------------------------
|
