Storing deteriorating acetate sheet film

I have some questions about sealing deteriorating acetate sheet film
into laminated paper/foil/polyethylene envelopes:

    Should negs be sealed in if they are not going into frozen
    storage, but returning to storage at 10 deg. C (50 deg. F)?

    Can they be sealed in with some absorbent material, such as
    microchamber paper, and then returned to 10 deg. C?

    Should they simply be stored in PAT approved paper envelopes and
    boxes at 10 deg. C until frozen storage can be put into
    place?

Should we be aiming to reduce the temperature in the storage vault
to a level where a variety of media is happy, say 5 deg. C?

The IPI Storage Guide for Colour Photographic material indicates
that sealing film into the sleeves is OK if the storage temperature
is below 13 deg. C (p39), but the Standard 18911:2000 (Annex C) says
deteriorating film should not be placed in sealed containers.

The storage vault the material will be returning to contains a range
of AV media. A dedicated acetate vault is not available. The vault
is not subject to dust, pollutants,excess light, water or fire
risks.

If we were to get a walk in freezer, are there significant
advantages in storing material at minus 20 deg. C (-4 deg. F) over
storing it at say -4 deg. C (25 deg. F)

Cheryl Jackson
Preservation
6212 6219


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                  Conservation DistList Instance 19:1
                 Distributed: Wednesday, June 15, 2005
                        Message Id: cdl-19-1-028
                                  ***