Archived posting to the Leica Users Group, 2010/03/21
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Surfactants that are also highly anti-static are only required for rollfilm, so they use other cheaper surfactants with the 1600, which has only ever been available in 135 to my knowledge - this also explains why 135 Neopan 400 will continue to be available. Acros is newer; by the time it was formulated PFOS's days were numbered, even though it had not been banned outright. So it was made with a different agent from the start, it seems. The fluorine peak that I saw when I examined 120 Neopan 400 by mass spectroscopy did not occur even with the first batches of 120 Acros. But it seems likely that reformulating 120 Neopan 400 without the PFOS would be uneconomic. It's a shame; it was always my standard 120 B&W film. Marty On Sun, Mar 21, 2010 at 4:49 PM, Mark Rabiner <mark at rabinergroup.com> wrote: >> These are discontinuations by Fuji in Japan. ?These films are gone. >> So, notably, is 120 format Neopan 400; which was discontinued because >> it contained perfluorooctanesulfonic acid (PFOS) as a surfactant and >> anti-static agent. ?PFOS was added to Annex B of the Stockholm >> Convention on persistent organic pollutants (POPs) in May 2009: >> http://chm.pops.int/Convention/Press...S/Default.aspx - Japan has just >> passed legislation to take up these new controls. ?Hence Fuji can't >> continue production of the current formulation. ?Communication has >> been poor and Fuji haven't said if there will be a new formulation. >> >> PFOS is a powerful immunosuppressant, carcinogen and persists and >> concentreates in biological systems. I'd have considered avoiding >> using Neopan 400 120 had I known that the film contained PFOS. ?PFOS >> can pass across skin; I am glad I've always worn gloves when >> processing. It also shows that films are very complex chemically and >> contain unexpected components. >> >> Marty >> > > Why would the 400 have it and not the 100 and or 1600? > > [Rabs] > Mark William Rabiner > > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >