Kay
Thanks for this explanation. But is it not a dangerous distinction?
TBBPA is, as far as I'm aware, used only where TBPA is part of the
prepolymer formulation, namely in epoxy resins and polycarbonates. What
is used in other laminates, such as polyimides? Why is there such a fuss
about bromine-free laminates if there is no political pressure? If it is
just a "green" action (IMHO, justified), then why is TBBPA excluded,
when we do have non-brominated substitutes already available?
I'm just perplexed why a probably environmentally favourable action
(Br-free laminates), with scientific backing, should be pooh-poohed by
the IPC when it actively promotes an environmentally unfavourable action
(Pb-free solder) without a scrap of scientific evidence as to the
sustainability.
Brian
Kay Nimmo wrote:
> Dear Brian
>
> It is quite simple - both articles are correct.
>
> RoHS does not currently apply to all brominated flame retardants, only to PBB and PBDE. These are typically used in plastic housings etc. TBBPA used in laminates is not covered by RoHS.
> regards
> Kay
>
> -----Original Message-----
> From: Brian Ellis [mailto:[log in to unmask]]
> Sent: 21 August 2003 12:15
> To: [log in to unmask]
> Subject: [LF] WEEE/RoHS clarification required
>
>
> I've just received the August IPC Review.
>
> On p. 6, there is an article, "Lead Time on Lead Free Dwindles". This
> re-states the deadline of 1 July 2006 for total lead-free soldering for
> products sold in Europe (ignoring the few named exceptions).
>
> On p. 4, there is an article, "IPC Quells Flames of Halogen-Free Issue",
> which claims, after study, that there is no reason not to use
> halogenated flame retardants, such as TBBPA.
>
> It is my understanding that the same EU directives require all laminates
> and plastics in electronics assemblies to use non-halogenated flame
> retardants, presumably from the same date (I have not checked this in
> the actual directives).
>
> Does this not reveal an extremely dichotomous polity on the part of the
> IPC? On the one hand, the IPC has gone hell-for-leather towards the
> lead-free goal, without an ounce of proven scientific reason. On the
> other hand, the IPC is opposing the halogen-free part of the same EU
> legislation, despite the fact that emissions of incinerated
> halogen-containing laminates may contain some highly hazardous and
> polluting substances, as shown by scientific studies. At the same time,
> it may lull exporters to the EU and members within the EU into a false
> sense of security into thinking that brominated flame retardants are
> here to stay, rather than be mandatorily substituted within a few years.
>
> I need clarification on this paradoxical dichotomy.
>
> Brian
>
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