I thought Halogen Free just like Lead free(.1%) also has maximum content percentages such as:
900 PPM maximum Chlorine
900 PPM maximum Bromine
1500 PPM maximum total Halogens
So you're Halogen Free if you are at these limits? Kindly clear me with this.
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]]
Sent: Friday, February 18, 2005 6:44 AM
To: [log in to unmask]
Subject: Re: [LF] RoHS compliance PCB
Ken & Bev,
Everything I have read is that the fire retardant used
in PCBs is TBBPA (tetrabromobisphenol-A), which is NOT
banned under RoHS. In fact, I think there was a post
on this list just recently that the EU had completed
their risk analysis of TBBPA and had concluded it was
okay to use.
However, TBBPA IS a bromide, so it will not comply
with halogen-free. Being lead-free does not guarantee
RoHS-compliance. Neither lead-free nor
RoHS-compliance guarantee being halogen-free.
Also, I talked with a PCB supplier recently and they
said that years ago some of the inks used in yellow
and red silkscreens contained cadmium. He also said
that all of the U.S. board houses he was aware of had
moved to non-cadmium based inks but he had heard
rumors that some of the Asian board houses might still
use cadmium inks.
-Camille Good
Portland, Oregon
--- Bev Christian <[log in to unmask]> wrote:
> Ken,
> I think the last question turned into a statement is
> a fair summary - as long as you leave in the phrase
> "in general"!
>
> They aren't going to be built with mercury or Cr(VI)
> and why would a board manufacturer add one of the
> banned families of fire retardants when one of their
> basic building blocks is a fire retardant? Getting
> rid of lead only leaves cadmium and I personally
> have never heard of a board being built with Cd,
> although that doesn't mean it has never been done.
> regards,
> Bev Christian
> Research in Motion
>
> -----Original Message-----
> From: Leadfree [mailto:[log in to unmask]]On Behalf Of
> Ken Patel
> Sent: February 17, 2005 2:47 PM
> To: [log in to unmask]
> Subject: Re: [LF] RoHS compliance PCB
>
>
> All,
> I visited the laminate supplier web-site and they
> all either talk about
> Leadfree or Halogenfree. They are not talking about
> RoHS compliance. Meaning
> we have to go to Halogenfree laminates directly? Are
> Leadfree laminates RoHS
> compliance in general?
>
> Re,
> Ken Patel
>
> -----Original Message-----
> From: James, Chris [mailto:[log in to unmask]]
> Sent: Thursday, February 17, 2005 1:42 AM
> To: (Leadfree Electronics Assembly Forum); Ken Patel
> Subject: RE: [LF] RoHS compliance PCB
>
> 1. try it, test it, and prove it - depends on your
> processes and end
> requirements. Apparently some people process Pb-F on
> phenolic.
>
> 2. if you put the requirement on your engineering
> drawing supplied to
> the fab house, maybe include it in your standard
> purchasing agreement
> and request a d of c from the vendor, then you have
> pretty well
> fulfilled your due diligence being there are no real
> practicable ways to
> test for RoHS compliance.
>
> Regards,
> Chris
>
> -----Original Message-----
> From: Leadfree [mailto:[log in to unmask]] On Behalf
> Of Ken Patel
> Sent: 16 February 2005 23:06
> To: [log in to unmask]
> Subject: [LF] RoHS compliance PCB
>
> All,
>
> I have heard that Fab Houses are moving directly to
> Halogenfree process,
> skipping middle step knowing that Halogenfree is
> next in line to be
> implemented. As our current fabs are built using
> laminate made of Tg of
> 170
> C or more with Nickel Gold surface finish, do you
> see any problem?
>
>
>
> Do we have to worry besides updating the fab notes
> asking for RoHS
> compliance? We expect fab house to build products
> based on impedance
> requirement. Any comments, suggestion?
>
>
>
> Re,
>
> Ken Patel
>
>
>
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