I think the intention was, as well, to avoid those who IMMEDIATELY
thought, 'well, if it is based on the total weight of my product, I'll
just make it weigh more, and then I am compliant'.
I can't tell you how many people already suggested to me that we just
add a brick or two to our products, until I explained to them the
established definition of the term "homogeneous".
I do think that they should have, moreso, used the total weight of each
substance in the product (ie all solder on the product, not each
individual solder joint). Then if one solder joint accidentally gets
contaminated, it is less likely to mean the whole product is
contaminated.
But I suppose there might be people who would somehow take advantage of
that, as well.
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of John Burke
Sent: 7-Dec-05 10:45 AM
To: [log in to unmask]
Subject: Re: [LF] RoHS Homogeneous Materials and PWB's
Think we may be missing something here.
The purpose is not to "prove" compliance of what a thing is made of by
grinding it up and doing some subjective analysis, but rather to
consider what is actually being used to create the piece.
The reason for the note on homogenous material is that someone somewhere
in the world actually makes the resins, copper, glass and all of the
other materials that go into a circuit board (as an example) , if those
materials are compliant, so is the board, right?
John
John Burke
Senior Manager - Operations , Optichron
[log in to unmask]
W: 510 249 5233
M: 408 515 4992
http://www.optichron.com
Profile: https://www.linkedin.com/e/fps/2665502/
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Jerome Wagner
Sent: Wednesday, December 07, 2005 4:27 AM
To: [log in to unmask]
Subject: [LF] RoHS Homogeneous Materials and PWB's
Folks: I wish to review your thinking on "homogeneous materials" and raw
printed wiring boards (unpopulated) and similar devices, such as organic
chip carriers. As you know, PWB's are made up of a number of materials
which would, ideally, be considered homogeneous materials: fiberglass,
dielectric resins or films, copper, soldermask, individual metal
finishes, osp... Once fabricated, these materials are intimately
combined; while possible, academically, to separate those materials from
finished product, that material collection would be impractical on a
continuing basis.
Now: the idea of "mechanically disjointed", from the WEEE faq document.
Again, one could argue that a finished pwb can't be mechanically
disjointed in a manner which would render compliance inspection/analysis
realistically possible.
Now: the need to validate supplier certifications through lab analysis.
If
I call the whole PWB the homogeneous material, then I grind up same and
submit that for analysis. No problem. Except that I have lost all
relation to the ideal homogeneous materials in the item. If, on the
other hand, I try to analyze at the ideal homogeneous material level, I
am forced to work under a scope with small tools, extracting (digging)
and separating minute amounts of certain materials from many pieces in
order to collect enough material to give reasonable detection limits in
the analytical tests.
Impractical.
As customers and as fabricators, are you calling the whole PWB a
homogeneous material or are you applying the definition and MCV to the
glass, dielectric, etc.?
Thanks much! jw
!! God Blesses !!
Jerry Wagner Dept 0056 Environmental Engineering B096-1
x56275 pg 58888-0658 (607)755-6275 fax: (607)755-6282
Huron Real Estate Associates, LLC and Endicott Interconnect
Technologies, Inc.
Via the Internet: [log in to unmask] [NOTES: Jerome
Wagner/Huron/EIT]
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