Karl,Dave
I posted this question to our Solder Mask supplier. The agent gave me
similar answer to you - "market demand".He was not able to submit any
regulation for such statement.I am waitig for reply from SM manufacturer.
"market demand" those are rumors, generated both by environment activists
and by smart people from marketing.Any way - SM thickness is just about
15-20 microns thickness , approx. 1% of total thickness of typical
PCB.Halogen content of SM is low ( mainly from pigments for green color -
really funny how green is far away to be "green" ) , so total impact of SM
on halogen evolution is neglible.
I will present this item to my managent in coming days. Just now I have
impression, that this item is still nothing more than just trend and not
requirement.
Edward
Edward Szpruch
Eltek Ltd
P.O.Box 159 ; 49101 Petah Tikva Israel
Tel ++972 3 9395050 , Fax ++972 3 9309581
e-mail [log in to unmask]
web site : www.eltekglobal.com
> -----Original Message-----
> From: Karl Sauter [SMTP:[log in to unmask]]
> Sent: ג אפריל 12 2005 19:20
> To: Environmental Issues; Edward Szpruch
> Subject: Re: [EN] Halogen Free Solder Mask
>
> Edward, Brian,
>
> The use of halogen-free soldermasks has been recommended to minimize
> the potential generation of chlorine dioxins during the combustion of
> soldermask. Soldermask contains no flame retardant and so can more
> easily and readily burn at lower temperatures given the opportunity.
> Although certainly the amount of chlorine involved is small, current
> amounts of chlorine present in soldermask can easily be reduced to less
> than 900 ppm "halogen-free" levels without significantly affecting
> performance or function.
>
> While the industry has to be evaluating more thermally robust
> soldermasks for higher temperature lead free assembly processing and
> rework applications (for better adhesion without discoloration
> during/after thermal excursions including rework) it seems prudent to
> include halogen-free soldermasks. We have seen good test results for
> halogen free soldermask after 6X 260 C reflow/rework conditions.
>
> Regards,
> Karl Sauter
> Sun Microsystems
>
>
> Edward Szpruch wrote:
> > Brian,
> > I already wrote,that I am not sure about dates, definistions etc.
> > We are dealing with suppliers of Solder Mask and they are pushing
> forward
> > "Halogen Free" formulations. This is how I got idea about need for HF
> solder
> > mask. Since I am not sure about the whole issue, I posted this question
> to
> > forum.
> > So what are really future regulations on HF ( not related to RoHS
> > regulations to be effective next year ).
> > Of course I am going to aske our suppliers of Solder Mask why they are
> > proposing HF formulations.
> > Edward
> >
> > Edward Szpruch
> > Eltek Ltd
> > P.O.Box 159 ; 49101 Petah Tikva Israel
> > Tel ++972 3 9395050 , Fax ++972 3 9309581
> > e-mail [log in to unmask]
> > web site : www.eltekglobal.com
> >
> >
> >>-----Original Message-----
> >>From: Brian Ellis [SMTP:[log in to unmask]]
> >>Sent: ג אפריל 12 2005 10:17
> >>To: Environmental Issues; Edward Szpruch
> >>Subject: Re: [EN] Halogen Free Solder Mask
> >>
> >>What gives you the idea of HF being mandatory by 2007? In any case,
> >>epoxy resis are rarely halogen free, because the epoxy group is supplied
>
> >>by epichlorohydrin. Granted that most of the resultant chloride in the
> >>prepolymerisation reaction is largely removed, but there is always some
> >>left, and this assumes a stoichiometric reaction. Most of the halides in
>
> >>normal FR-4 are from TBBPA, which is not targeted by the EU directives.
> >>Do you know of any other political entity wanting to ban TBBPA?
> >>
> >>As for solder masks, there could be 101 (well, nearly!) chemistries
> >>involved, and each would have to be taken on its own merits. It would be
>
> >>impossible to generalise.
> >>
> >>Brian
> >>
> >>Edward Szpruch wrote:
> >>
> >>>Hi all,
> >>>Recently I have been asked about "Halogen free Solder Mask".
> >>>As I understand, "Halogen Free" restrictions on PCB are expexted to be
> >>>employed in summer 2007 ( ? ).
> >>>What are the definitions of "Halogen free" ???
> >>>I had impression,that definition is based on limit of % wt ( 0.1% ???)
> >>
> >>of
> >>
> >>>PCB. If this is true , taking into account amount of Solder mask on PCB
> >>
> >>and
> >>
> >>>possible % of halogens in Solder Mask formulations , it seems to me,
> >>
> >>that
> >>
> >>>such contributions of Halogens originated in Solder Mask is neglible.
> >>>Pls comment.
> >>>regards to all
> >>>Edward
> >>>
> >>>Edward Szpruch
> >>>Eltek Ltd
> >>>P.O.Box 159 ; 49101 Petah Tikva Israel
> >>>Tel ++972 3 9395050 , Fax ++972 3 9309581
> >>>e-mail [log in to unmask]
> >>>web site : www.eltekglobal.com
> >
> >
>
> --
> Karl Sauter Staff Engineer, Engineering Technologies
> Sun Microsystems Inc.
> Office: (650) 786-7663 / x87663
> E-mail: [log in to unmask]
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