ISO 18928:2002

SLOVENSKI STANDARD
SIST ISO 18928:2011
01-julij-2011
Upodobitveni materiali - Neprocesirani fotografski filmi in papirji - Shranjevanje
Imaging materials - Unprocessed photographic films and papers - Storage practices
Matériaux pour l'image - Films et papiers photographiques non traités - Pratiques de
stockage
Ta slovenski standard je istoveten z: ISO 18928:2002
ICS:
37.040.20 )RWRJUDIVNLSDSLUILOPLLQ Photographic paper, films
IRWRJUDIVNHSORãþH)LOPVNL and cartridges
]YLWNL
SIST ISO 18928:2011 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ISO 18928:2011

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SIST ISO 18928:2011
INTERNATIONAL ISO
STANDARD 18928
Second edition
2002-02-01
Imaging materials — Unprocessed
photographic films and papers — Storage
practices
Matériaux pour l'image — Films et papiers photographiques non traités —
Pratiques de stockage

Reference number
ISO 18928:2002(E)
©
ISO 2002

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SIST ISO 18928:2011
ISO 18928:2002(E)
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©
ii ISO 2002 – All rights reserved

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SIST ISO 18928:2011
ISO 18928:2002(E)
Contents Page
1 Scope . 1
2 Term and definition . 1
3 Storage conditions . 1
3.1 General . 1
3.2 Relative humidity . 1
3.3 Temperature . 2
3.4 Gases . 2
3.5 Extraneous radiations . 2
4 Temperature acclimatization . 3
5 Mechanical requirements . 3
6 Handling conditions . 3
Annexes
A Numbering system for related International Standards. 5
B Background radiation . 7
Bibliography. 8
©
ISO 2002 – All rights reserved iii

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SIST ISO 18928:2011
ISO 18928:2002(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
member bodies). The work of preparing International Standards is normally carried out through ISO technical
committees. Each member body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, governmental and non-governmental, in
liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 18928 was prepared by Technical Committee ISO/TC 42, Photography.
This second edition cancels and replaces the first edition (ISO 10331:1991), which has been technically revised.
This International Standard is one of a series of standards dealing with the physical properties and stability of
imaging materials. To facilitate identification of these International Standards, they are assigned a number within the
block from 18900 to 18999 (see annex A).
Annexes A and B of this International Standard are for information only.
©
iv ISO 2002 – All rights reserved

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SIST ISO 18928:2011
ISO 18928:2002(E)
Introduction
International Standards have been written specifying the recommended practices for the storage of processed safety
photographic film (ISO18911), processed photographic reflection prints (ISO18920), processed photographic
plates (ISO 18918) and the specifications for safety film (ISO 18906).
This International Standard is concerned with the storage of unprocessed photographic materials. While many of the
recommendations for unprocessed and processed storage are very similar, there are some important differences.
These include the very beneficial effects of low temperature and the harmful effects of adverse storage and radiation.
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ISO 2002 – All rights reserved v

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SIST ISO 18928:2011

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SIST ISO 18928:2011
INTERNATIONAL STANDARD ISO 18928:2002(E)
Imaging materials — Unprocessed photographic films and
papers — Storage practices
1 Scope
This International Standard specifies recommended storage conditions for unprocessed photographic materials. It is
not applicable to processed films and prints.
This International Standard is applicable to black-and-white and colour photographic materials (negative films,
positive films, reversal films, positive papers, and X-ray films) as well as to safety films.
2 Term and definition
For the purposes of this International Standard, the following term and definition apply.
2.1
raw photographic material
photographic material that has not been exposed to actinic radiation and has not been processed
3 Storage conditions
3.1 General
The photographic properties of imaging materials change during ageing. These changes result from high
temperatures and high relative humidities and may also be influenced by plastics, papers, solvents, lacquers,
varnishes, gases (see 3.4) and extraneous radiation (see 3.5). Frequent temperature changes may also have
adverse effects.
Changes caused by unfavourable storage conditions may be much greater than those due to variations in original
manufacture. It is important to comply with the manufacturer's recommended storage conditions and, where given, to
an expiration date.
Films and papers should be exposed and processed as soon as possible after the original package has been
opened. Opened packages should be resealed under recommended conditions for further storage.
3.2 Relative humidity
Photographic material should generally be kept in equilibrium with 40 % to 60 % relative humidity (RH). Containers
shall be kept sealed until the material is used.
Films and papers are not usually stored for long periods between exposing and processing. Production schedules,
customer needs, latent image fading or growth, etc., are important factors here. Furthermore, vesicular, diazo,
thermally processed silver and electrographic type materials are normally processed immediately.
If conventional sheet films or papers are not to be processed immediately, they may be stored in commercially
available light-tight “paper safes” or in the manufacturer's original container.
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ISO 2002 – All rights reserved 1

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SIST ISO 18928:2011
ISO 18928:2002(E)
The relative humidity of the storage area shall be maintained below 65 % because higher humidities can damage
containers (e.g. rust), cause labels, tapes and cartons to deteriorate and encourage the growth of fungi. It can also
induce adhesion (blocking) between adjacent laps or layers.
Humidities below 30 % can make film and paper temporarily brittle and lead to unacceptable curl and possible
emulsion cracking.
3.3 Temperature
Recommended temperatures during storage depend on the kind of photographic material and on the duration of
storage. General guidelines are given in Table 1. In all cases, the information provided by the manufacturer shall be
followed.
◦
When storing for less than a month, photographic materials may be kept at approximately 25 C. Most manufacturers
◦
recommend a maximum temperature of 13 C for longer periods. Manufacturers' expiration dates can be extended
◦
by storing at still lower temperatures. Note that infrared-sensitive films shall be stored at −18 C.
If films or papers are to be kept for several days or more between exposing and processing, many of the
considerations in clause 3 apply. Storage temperatures should be the same for exposed as for unexposed material.
Table 1 — Storage temperature for films and papers
Sensitive layer of films and papers Storage from 1 month to 6 m
...