Hi Bev,
How was the testing done? Did you use a XRF device? Do you have in place, a sampling plan to test incoming components?
Thanks,
Amol Kane
M.S (Industrial Eng.)
Process Engineer
Harvard Custom Manufacturing, Inc.
941 Route 38 Owego, NY 13827
Phone: (607) 687-7669 x349
[log in to unmask]
www.harvardgrp.com
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Bev Christian
Sent: Tuesday, June 27, 2006 11:26 AM
To: [log in to unmask]
Subject: Re: [LF] Clarification sought on Pb-containing ceramic
Mike,
Thanks. That's what I thought, but I just wanted some hand-holding. :)
Just for interest for the wider audience, we have caught:
1) A major LCD supplier
2) A major producer of BGAs
3) A major chip manufacturer
Each gave us certified RoHS compliant parts that were not. Now in each
case I am sure that the mistake was not done for devious purposes. In
one case it was an honest misinterpretation of the directive and in the
other two it was an "oops!". Nevertheless, these are cases that could
have come back to bit us. All three involved lead. We have tested
hundreds and hundreds of parts.
Bev
RIM
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Mike Kirschner
Sent: Tuesday, June 27, 2006 11:13 AM
To: [log in to unmask]
Subject: Re: [LF] Clarification sought on Pb-containing ceramic
Bev,
I've had this discussion with one of the major SMT resistor
manufacturers.
They consider it a glass with a "conductive phase in it"; just the same,
glass or ceramic it's exempt in electronic components.
Mike
On Mon, 26 Jun 2006 08:41:49 -0400, Bev Christian <[log in to unmask]>
wrote:
>"Examples of semimetallic ceramics are lead oxide (PbO), ruthenium
>dioxide (RuO2), bismuth ruthenate (Bi2Ru2O7), and bismuth iridate
>(Bi2Ir2O7). Like metals, these materials have overlapping electron
>energy bands and are therefore excellent electronic conductors. They
are
>used as "inks" for screen printing resistors into thick-film
>microcircuits. Inks are pulverized conductor and glaze particles
>dispersed in suitable organics, which impart the flow properties
>necessary for screen printing. On firing, the organics burn out as the
>glazes fuse. By varying the amount of conductor particles, it is
>possible to produce wide variations in the resistance of thick films."
>Britannica.com
>
>I would presume the use of lead in this instance is exempt. I would
>consider fused lead oxide as a ceramic. That is my interpretation.
>Comments?
>Bev
>RIM
>
>
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