The MSDS for Molecular Sieves is available on the Kodak website:
The Product Name is "Molecular Sieve".
Here is a link to the technical data:
Unlike simple silica gel, Molecular Sieves contain a specific crystalline
form of Sodium Alumino-Silicate (or Zeolite) that adsorb not only
moisture, but organic vapors like acetic acid. They are so effective that
you can actually observe them gain weight as they adsorb moisture --- if
you put a fresh Molecular Sieve from its sealed package on a scale, it
will pull moisture from the air and gain weight. Once the Molecular
Sieves are removed from their original sealed packaging, they DO have a
shelf life, as they adsorb moisture and organic vapors to the point they
are not able to adsorb additional material.
Here is the original paper presented to the AMIA on December 10, 1992, and
published in the IS&T Journal:
A. T. Ram, D. F. Kopperl, R. C. Sehlin, S. Masaryk-Morris, J. L. Vincent
Miller, 'The Effects and Prevention of the Vinegar Syndrome,' Journal of
Science and Technology 38 (1994): 249-261.
I also presented a paper "Molecular Sieves -- An Aid to Film Preservation"
at the SMPTE Technical Conference in Los Angeles on November 2, 1993.
Here are some additional references:
John P. Pytlak
Senior Technical Specialist
Customer Technical Services
Research Labs, Building 69, Room 7525A
Eastman Kodak Company
Rochester, New York 14650-1922 USA
Telephone: +1 585 477 5325
Cell: +1 585 781 4036
Fax: +1 585 722 7243
e-mail: [log in to unmask]
And speaking of molecular sieves... I know where there's a couple cans
of this stuff sitting around, and was never sure what it is! I kind of
guessed something like silica gel, used for sucking up moisture, but the
name is so much more high-techie I figured there might be more to it.
Does it have a shelf life? I wonder if these cans are still any good.
-- Eric Wenocur
Lab Tech Systems