Cellulose acetate film

As a safety film ( IDs: non flam, de sécurité, safety or safety film) is called an introduced around 1901 cinema and photographic film with cellon as a support for the light-sensitive photographic emulsion; Cellon is a product of cellulose acetate.

In contrast to the highly flammable celluloid film is safety film - as the name suggests - less flammable.

History and Development

The safety film is a development of celluloid film of nitrocellulose ( Eastman: American Film, 1888), which in turn is an evolution of the paper film ( Eastman: stripping film, 1884 or 1889); Nitrate-based film materials are considered to be acute danger for photo collections and historic archives, spontaneous combustion starts at about 38 ° C is possible; this starting material corresponds to the guncotton and is counted in Germany to the explosives (see Explosives Act ( Explosives ) of 17 April 1986).

Agfa and Kodak took over the production of safety films based on cellulose acetate in 1908. Assembled safety film has been initially as a 16- mm film for motion pictures, and later in other Assemblies.

Germany issued on 30 October 1939 Regulation on the safety film, which stipulated that from April 1, 1940 films were allowed to be made ​​only on security films. Due to the Second World War, however, this rule could not be enforced. In Europe, the safety film finally sat through a large area from about 1952; one can therefore assume that most processed before 1952 in Germany films are based on nitrate carrier material. A not confirmed agreement in the industry was to fabricate only safety film from 1 January 1951. With ISO 543 name, test methods and marking of safety film are recorded.

Modern security film is made of cellulose acetate or PETP polyester.