Overview
ISO 10356:1996 - "Cinematography - Storage and handling of nitrate‑base motion‑picture films" specifies safety requirements and practical guidance for handling, storing, inspecting and disposing of cellulose‑nitrate film stocks. It applies to all nitrate‑base motion‑picture films (those that fail the ignition/burning tests in ISO 543) and focuses on the fire, chemical‑deterioration and toxic‑gas hazards unique to nitrate film. The standard is intended to complement legal and transport rules (dangerous‑goods regulations) rather than replace them.
Key topics and requirements
- Scope and identification
- Applies to radiation‑sensitive nitrate‑base films; identification is carried out per ISO 543. Films lacking ISO 543 safety markings should be treated as nitrate until proven otherwise.
- Hazards
- Cellulose nitrate is highly flammable, has low ignition temperature, can decompose autocatalytically to produce toxic/oxidising gases and can auto‑ignite, especially in closed containers.
- Transportation and legal compliance
- Transport must follow national and international dangerous‑goods laws and regulations; nitrate‑base film must not be sent by mail.
- Storage practice
- Store rolls in individual metal cans (aluminium or stainless steel) with fitted but unsealed lids until duplication.
- Keep nitrate film in dedicated storage rooms or chambers equipped with ventilation, fire detection, sprinklers and segregation to prevent fumes reaching other areas.
- The standard recommends limiting quantities per room (example figure used in the text: up to 50 000 m of film per room) and following recommended climate conditions (see Table 1 of ISO 10356 for short‑ and long‑term values).
- Lower relative humidity can slow chemical deterioration but may make film brittle; allow acclimatization before handling.
- Inspection and testing
- Inspect stored nitrate film regularly - at least once per year, preferably every three months; visual inspection includes unwinding to check images, odour and physical changes.
- Annex C describes a qualitative stability test using alizarin red C or Congo red: heat film samples (indicator paper detects nitric oxides) and interpret time‑to‑colour‑change to decide retest, copying, or destruction.
- Preservation and destruction
- Deterioration is irreversible - duplicate usable content to safety film and then destroy the nitrate original in accordance with laws and regulations.
Applications and users
ISO 10356 is practical for:
- Film archives, museums and cultural heritage institutions managing nitrate collections
- Film laboratories and restoration facilities planning duplication to safety stock
- Storage facility designers and safety officers implementing fire‑safe storage and ventilation
- Transport and logistics teams handling historical film reels
Related standards
- ISO 543:1990 - Photography - Specifications for safety film (normative reference used for identifying safety vs nitrate film)
Keywords: ISO 10356:1996, nitrate‑base film, cellulose nitrate, storage and handling, motion‑picture film, film preservation, nitrate film safety, ISO 543, inspection, alizarin red, Congo red.
