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Kodak makes ESTAR that is used for sheet films sold by Kodak Alaris. The characteristics of ESTAR, history, the manufacturing process, and many of the films that use ESTAR are described in "Making KODAK Film".
ESTAR is superior to acetate for dimensional stability and most other characteristics.
Kodak's licensing of PET from DuPont who licensed from Imperial resulted in ESTAR Film Base. Kodak greatly improved the process so it was suitable for photographic film use. Estar was first used for Aerial, Graphic Arts , and x-ray film applications. Aerial and graphic needed the dimensional stability. X-ray needed ESTAR's stiffness that allowed reliable roller transport film processing in machine that did not have directly opposable rollers. This allowed precise, defect-free rapid x-ray film processing.
Later other applications adopted ESTAR. EKTACHROME was one of the last conversions from Acetate to ESTAR. The one application that kept acetate for Ektachrome sheet film available was emulsion stripping. Skilled retouchers can remove portions of the combined emulsion layers from acetate and place them on another support to modify images. This technique was common prior the the use of Kodak Premier Image Enhancement Equipment and later Photoshop. The lack of a suitable solvent for ESTAR makes emulsion stripping nearly impossible for ESTAR-based films.
If there are more questions send a message to me.
www.makingKODAKfilm.com
ESTAR is superior to acetate for dimensional stability and most other characteristics.
Kodak's licensing of PET from DuPont who licensed from Imperial resulted in ESTAR Film Base. Kodak greatly improved the process so it was suitable for photographic film use. Estar was first used for Aerial, Graphic Arts , and x-ray film applications. Aerial and graphic needed the dimensional stability. X-ray needed ESTAR's stiffness that allowed reliable roller transport film processing in machine that did not have directly opposable rollers. This allowed precise, defect-free rapid x-ray film processing.
Later other applications adopted ESTAR. EKTACHROME was one of the last conversions from Acetate to ESTAR. The one application that kept acetate for Ektachrome sheet film available was emulsion stripping. Skilled retouchers can remove portions of the combined emulsion layers from acetate and place them on another support to modify images. This technique was common prior the the use of Kodak Premier Image Enhancement Equipment and later Photoshop. The lack of a suitable solvent for ESTAR makes emulsion stripping nearly impossible for ESTAR-based films.
If there are more questions send a message to me.
www.makingKODAKfilm.com