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I think that the design of the sleeves, as well as the initial recommendation to seal them, was in the original Pickett/Lemcoe report. The research which led to the Pickett/Lemcoe report was begun 50 years ago! Much of their findings are still valid, but not the sealing of lacquer disc sleeves. ARSC's re-publication of the report includes this caveat. Sam On 2/14/07, Eugene DeAnna <[log in to unmask]> wrote: > > We still use the Shield Pack sleeves for lacquer discs here at LC. I > believe that the issue of inhibited air exchange arose from a very early > practice of sealing the discs in the sleeves. Obviously that was a bad > idea. Otherwise, we have not noted any problems with air exchange or > accelerated degradation of lacquers. The only problem we have had with the > sleeves - and this was with a later "batch" we had manufactured - was that > the sleeves arrived badly warped. These we only use for rigid discs - glass > or metal-based lacquers - and not for more pliable vinyl or even shellac. > > Gene DeAnna > Head, Recorded Sound Section > MBRS Division > Library of Congress > (202) 707-3108 > > >>> <[log in to unmask]> 02/14/07 9:44 AM >>> > >2. Is anyone familiar with foil-lined sleeves? I have not seen any > imprinting or other problems with the discs, but is there concern > of outgassing or any other problems? > > Marcos, > > These may be a type of sleeve known as the "shield pack". As far as I > kno w > they have been discontinued not because the sleeves off-gassed but, > because > they inhibited air exchange (i.e. created a micro-environment)and seemed > to > in fact accelerate the degradation of lacquered discs, which of course do > off-gas. > > I seem to recall that they were developed at least in part by the Library > of Congress and, if that's so, someone from LC could probably give you a > more complete history. > > Best, > > Danny > > > Daniel Sbardella > The New York Public Library for the Performing Arts > 40 Lincoln Center Plaza > New York, NY 10023 > > 212.870.1609 >