Many thanks to all, Tom, David and Richard... I went through IPC-1601 A, IPC-4553 and also a bit in IPC-4552 (2017/8). Now it is clear. Best Regards Gabriele -----Messaggio originale----- Da: TechNet [mailto:[log in to unmask]] Per conto di Stadem, Richard D Inviato: mercoledì 24 gennaio 2018 14:56 A: [log in to unmask] Oggetto: Re: [TN] Sulfur Free Paper and Acid Free Papaer ? Silver Saver paper is also fully discussed in IPC-4553 section 3.8, where it is described as both sulfur-free AND pH-neutral (non-acidic). There is also good information on the proper positioning of the desiccant inside the bundle, where it cannot make direct contact. What is little-known is that the desiccant must also be sulfur-free. It is a hard requirement for the desiccant, tapes, labels, markers, rubber bands, if used. The standard says to exclude these materials from the drypack, but if used they must be sulfur-free. The debbil is in the details! -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of David Hillman Sent: Wednesday, January 24, 2018 7:21 AM To: [log in to unmask] Subject: Re: [TN] Sulfur Free Paper and Acid Free Papaer ? Hi Gabriele - in addition to the info that Tom provided, the IPC-1601A specification has some information on "Silver Saver" paper which is used for the purpose you are investigating. Dave Hillman Rockwell Collins [log in to unmask] On Tue, Jan 23, 2018 at 6:04 PM, SALA GABRIELE <[log in to unmask]> wrote: > Hello > > > > Please, could someone there explain me the difference , if there is > any, between Sulfur Free Paper and Acid Free Paper ? > > > > I am investigating about paper sheets interposed between PCB (ENIG > and ImAg > finisch) when piled up for packaging and shipping. > > > > Many thanks > > > > Gabriele > > > > --- > Questa e-mail è stata controllata per individuare virus con Avast > antivirus. > https://www.avast.com/antivirus > --- Questa e-mail è stata controllata per individuare virus con Avast antivirus. https://www.avast.com/antivirus