Plastic enclosures

I am forwarding the message below which came from the Archives list
in case any of you can help.

    I am trying to find references concerning the advisability of
    using plastic wallets for long-term records storage.  I am aware
    that it is generally a bad thing to do (migration of print,
    fosters humidity, not-very-inert material, etc.) but would
    welcome *specific, published* information on a) how long one can
    use a plastic folder before it becomes a problem and b) the
    effect such a folder has on paper records, especially those
    printed using a laser printer.  And perhaps c) what effect a
    less-than-ideal environment would have on records in a plastic
    folder.

    I have consulted the Conservation OnLine (CoOL) web site with no
    success. Thanks in advance for any help,

    Sarah J. A. Flynn
    Archivist (Historical Records)
    Information Services
    Glaxo Wellcome Research and Development
    Greenford Road
    Greenford
    Middlesex UB6 0HE
    +44 181 966 2395
    Fax: +44 181 966 2240
    gxx46876<-a t->glaxowellcome< . >co< . >uk

Anna

                                  ***
                  Conservation DistList Instance 11:44
                 Distributed: Friday, November 14, 1997
                       Message Id: cdl-11-44-017
                                  ***