Engineering Question #1950

Lindsay, a 22 year old female from New York City asks on March 2, 2004,

What is the chemical make-up of film? I am searching for a detailed make-up of either 35mm film for photography or film that is used in the cinema.

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The answer

Barry Shell answered on March 2, 2004

The main ingredient or the base of many films is cellulose triacetate, also known as "celluloid". Nowadays, modern film base is kind of polyester. A diagram of the layers of photographic film can be found at Kodak.

A history of the plastic for film can be found at the Plastics Historical Society.

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