Kodak D-31 - Manual (Page 13)

10 D-31 June 2002
Composition of Enclosure Materials
Paper
Paper should be made from rag, bleached sulfite
or bleached kraft pulp with an alpha-cellulose
content greater than 87%. It should be free from
highly lignified fibres, such as ground wood, as
determined by the phloroglucinol spot test.
For paper in direct contact with black-and-white
photographic material, the pH should be between
7.5 and 9.5. The pH should be close to 7.0 when
in direct contact with color or diazo material. There
should be an alkali reserve of at least 2% (m/m).
The alkali reserve should be obtained by the
incorporation of an alkaline earth carbonate.
Neutral or alkaline-sizing chemicals should be
employed and the material should be essentially
free from particles of metal. Glassine envelopes
should not be used.
Plastic
Suitable plastic enclosure materials are
photographic film support materials such as
uncoated polyester (polyethylene terephthalate)
polypropylene and polyethylene. Chlorinated
or nitrated sheeting should not be used and
cellulose nitrate, in particular, should be avoided.
Metal
Metal enclosures should be noncorrosive
materials such as anodized aluminum or stainless
steel. The use of steel is permissible, provided
that the surface is well protected by lacquer,
enamel, tinning, plating, or some other corrosion-
resistant finish. Lacquer, which might give off
reactive fumes, peroxides, or exudations during
storage should not be used.
Adhesive
Some photographic images can be damaged
by adhesives incorporating impurities such as
sulfur, iron, copper, or other ingredients that
might react with image silver or gelatin. Pressure-
sensitive adhesives and ether-linked products
should be avoided.
Rubber-based products such as rubber cement
should not be used. Not only might they contain
harmful solvents or plasticizers, but they might be
compounded with photographically damaging
sulfur, usually as a vulcanizer, accelerator, or
stabilizer. Even some “low-desensitizing” or
“sulfur-free” rubbers contain sulfur.
Photographic-quality gelatin and many polyvinyl
acetate and cellulose ester adhesives are
suitable for use with paper enclosures. Heat
sealing and mechanical sealing should be used
when possible.
Printing Inks
Printing inks are known to cause microscopic
spots in fine-grain silver microfilm; consequently,
there should be no printed matter on the inside of
the filing enclosure. The ink used for imprinting
the outside of filing enclosures should not bleed,
spread, or transfer, and it should not be a source
of products that attack the photograph or the
enclosure itself.
For additional specifications, see ANSI/PIMA
IT9.11-1998
5 (ISO 18911) and ANSI/PIMA
IT9.2-1991 6 (ISO 18903).
Theft Protection
Safes provide good protection against the theft of
valuable records. Where such records are large in
number, vaults of burglar-proof construction may
be required. Theft of important records involves
double peril—that of classified films falling into
unauthorized hands and the complete loss of
valuable information. Protection against the latter
can, of course, be provided by storing duplicate
records in another location.