Table 2: Storage Life Of Microfilms - Kodak D-31 Storage Manual

Film/Type/Parameter
Silver-Gelatin Films
Residual Hypo
Residual Silver Salts
All Films—
Storage Conditions
Temperature and
Relative Humidity
Air Conditioning
Air Purification
Enclosures
NOTES:
(1) Expressed as thiosulfate ion.
(2) Specific limits have not been set—the recommended washing should be satisfactory.
(3) Dehumidification may be necessary even though automatic air conditioning is not practical.
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Table 2: Storage Life of Microfilms

Medium Term
(Minimum of 10 Years)
(1), (2)
—
Not necessary
unless film records
are subjected to
frequent or sustained
high humidity (3)
Normal
Not necessary with
moisture control
and/or air conditioning
Anticipated Storage Life
Extended Term
(Minimum of 100 Years)
Not above 0.030 grams
per square meter (1)
No more than perceptible tint by spot stain test.
See Table 3
Essential—including slightly positive air pressure.
Must be free from airborne gases, dirt particles,
and other contaminants.
If proper humidity control is provided, plastic or
metal, unsealed, can be used.
If adequate humidity control is not available, only
metal or glass sealed containers are acceptable.
Long Term
(Indefinitely)
Not above 0.014 grams
per square meter (1)
D-31 June 2002