RoHS banned all PBDE's and PBB's - including deca-BDE. It was a general
misconception that the listing of deca-BDE as an item for study also
meant that it was exempt - it was not exempt until the published
decision last year that specified that.
Bear in mind that several Member States and other organistaions are
strongly against this exemption for deca-BDE under RoHS and e.g. the
European Parliament is taking the Commission to court, challenging the
basis for that exemption, and aiming to achieve withdrawal of it.
Some countries are taking their own action e.g. Sweden proposes to ban
deca-BDE in products other than electronics.
There is a separate Directive 2003/11/EC (6 February 2003) ammending
76/769/EEC restrictions on marketing and use of dangerous substances
which already prohibits the use of;
penta-BDE (bromodiphenyl)
octa-BDE (bromodiphenyl)
By the way, there is a report on progress of the category 8 and 9 review
at the IPC-Soldertec conference in Malmo in April.
Kay
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Camille Good
Sent: 21 February 2006 20:31
To: [log in to unmask]
Subject: [LF] why is deca-BDE special? - was Re: [LF] Soldermask for PC
Boards
Dave,
I had read about RoHS for a while before I started running across
references to the different types of poly-BDEs; a lot of articles about
RoHS just mention PBDE ("P" for "poly", not "penta"). I don't know what
the stability difference between deca-BDE vs. octa- & penta-BDE is, and
I am not even sure if it's a stability issue or a mobility in the
environment issue.
If I remember what I read correctly, the original RoHS legislation
banned octa- & penta-BDE outright, and said that deca-BDE was an item of
concern that needed more study. An EU commission was set up to study
deca-BDE, and they published a report sometime in 2005 (or possibly late
2004?) saying they had reviewed the evidence and deca-BDE was okay to
use and didn't need to be banned.
Around about the time the EU study group said deca-BDE was okay to
use, there had also been some environmental study or studies that found
small amounts of deca-BDE in some arctic animal (maybe polar bears?) and
maybe another study (my memory's starting really fuzzon on this one)
that found deca-BDE in women's breast milk. I DO remember seeing some
articles from the environmental groups that were outraged that the EU
commission had decided to permit continued use of deca-BDE, because in
their eyes the recent studies clearly showed it WAS mobile in the
environment.
(Please note, I don't endorse either position and don't know enough to
come down firmly on side or the other. Yes, I think it's kind of weird
to find traces of the stuff in animals that I would think never come
into contact with it. Yet I also find value in the assertion that if a
person looks closely enough for samples that are tiny enough, they can
probably find minute traces of just about anything in just about any
place, and the bigger question should be "what effects does this
substance have at the concentrations found", rather than "can we find
any traces if we look hard enough". I was raised on a grain farm and
between the gasoline, diesel, sixteen dozen types of lubricants &
sealants, pesticides, herbicides, plant matter, mouse nests, bird nests,
grain dust, regular dust, occasional painting, and even a tiny little
bit of welding, I am sure anyone looking closely enough could find all
types of surprising things floating around in me -- but whether any of
that is th!
ere in
sufficient quantities to directly or indirectly contribute to poor
health or an untimely demise is another issue entirely, and I generally
seem to have less health complaints than a lot of office workers I know
who were raised in much "cleaner" (or at least tidier) surroundings.)
As Dan Kallin noted in another post, deca-BDE is okay per the European
RoHS, but not all halogen-free legislation has given it a pass. I think
that the penta-, octa- & deca-BDE issue is something that only shows up
if you are using synthetic materials that have poly-BDEs as fire
retardants. You would probably need to talk to your plastics supplier to
find out what specific poly-BDE is in the plastics you are using.
Hope this helps. Perhaps there are other list members who could shed
more light on the issue?
-Camille Good
Portland, Oregon
P.S. I also know that deca-BDE gets used as a fire retardent for
furniture fabric. A friend of mine who is fairly "green" recently bought
a couch and said that (1) she was very concerned about getting a couch
that did not have any bromines in it, and (2) she had to look at a lot
of furniture stores before she found one that met the requirements, most
of the stores she talked to said either yes their furniture used it, or
they had no idea what she was talking about, and she only finally found
a bromine-free couch at a place that carried European furniture.
MA/NY DDave <[log in to unmask]> wrote:
Hi Camille, OrganicChemistry-UnChallenged IPC LF Listservers,
This is from a note by Camille, and I was wondering about a small point
that probably I should know.
<====
other "green" technology issues a couple of years ago, I would sometimes
call something "halogen-free" rather than type out "does not contain the
PBBs or PBDE's, specifically penta-BDE and octa-BDE [because deca-BDE is
still okay, so even saying all poly-BDEs isn't technically correct] that
are banned by RoHS". The discussion early last year showed me that when
I
was asking "halogens", I was using a far more generic term than I
realized.>
<=====
penta is 06 I believe
octa is 08
deca is 10
If the above is correct what makes deca so much more stable.
Yours in Engineering, Dave
YiEngr, MA/NY DDave
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