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 > >