Overview
SIST ISO 18928:2014, titled Imaging materials - Unprocessed photographic films and papers - Storage practices, is an international standard developed by ISO/TC 42 Photography. This standard provides comprehensive guidelines for the recommended storage conditions of unprocessed photographic materials, including black-and-white and color films, positive and reversal films, photographic papers, and safety films. Proper adherence to this standard ensures the preservation of photographic material quality prior to processing, minimizing deterioration from environmental factors.
Key Topics
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Scope and Applicability
SIST ISO 18928:2014 applies exclusively to unprocessed photographic materials such as negative and positive films, reversal films, photographic papers, and X-ray films. It is not intended for processed films or photographic prints.
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Storage Conditions
Effective storage practices focus on maintaining optimal temperature and relative humidity (RH) to prevent premature ageing and damage:
- Temperature: Recommended temperatures depend on material type and storage duration. For exposures shorter than one month, up to 25 °C is acceptable. For longer storage, temperatures should be below 13 °C, with very long-term storage ideally at -18 °C to -20 °C.
- Relative Humidity: Photographic materials should be stored between 40% and 60% RH and protected from levels below 30% or above 65% to avoid brittleness, curling, fungal growth, and container degradation.
- Handling Temperature Acclimatization: Materials stored at low temperatures require a warm-up period before use to prevent condensation.
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Protection Against Environmental Hazards
- Gases: Storage areas must avoid exposure to harmful gases such as hydrogen sulphide, sulfur dioxide, formaldehyde, and oxidizing compounds that can fog or desensitize materials.
- Radiation Exposure: Exposure to extraneous penetrating radiation, including X-rays and certain natural background radiation sources, must be minimized. Airport X-ray inspections can damage unprocessed films. Hand inspection is recommended to prevent fogging and loss of image quality.
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Mechanical Storage Requirements
Proper physical storage includes orienting rolls horizontally to avoid pressure damage and storing sheet materials vertically or horizontally depending on size and packaging status.
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Handling Guidelines
Handling should occur in controlled environments with 20 °C to 24 °C temperature and 40% to 65% RH. Use of lint-free cotton gloves, dust filters, and caution against static and physical damage such as kinking or fingerprinting is advised.
Applications
SIST ISO 18928:2014 is essential for industries and professionals involved in:
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Photographic Material Manufacturing and Storage
Ensuring that unprocessed films and papers maintain their photographic integrity during storage before distribution or development.
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Archival and Museum Environments
Preserving unexposed photographic stock to extend shelf life and prevent degradation critical for cultural heritage and scientific documentation.
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Medical Imaging Facilities
Storing unprocessed X-ray films under conditions that prevent image quality deterioration before use.
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Photography Labs and Studios
Implementing best practices for unprocessed material storage that align with manufacturer recommendations to improve processing outcomes.
Related Standards
For comprehensive imaging material management, SIST ISO 18928:2014 complements the following ISO standards:
- ISO 18906: Imaging materials - Photographic films - Specifications for safety film
- ISO 18911: Imaging materials - Processed safety photographic films - Storage practices
- ISO 18918: Imaging materials - Processed photographic plates - Storage practices
- ISO 18920: Imaging materials - Reflection prints - Storage practices
Adhering to SIST ISO 18928:2014 ensures the preservation of unprocessed photographic materials through scientifically backed storage conditions-helping professionals maintain high-quality imaging results by minimizing environmental and mechanical risks during storage. Proper implementation safeguards investment in photographic stock and supports consistent, reliable image production.