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pellicle definition

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a thin, optically transparent film, typically of nitrocellulose, attached to and supported by a frame, and attached to a photomask (or photomask reticle). Its purpose is to seal out contaminants and reduce printed defects caused by contamination in the image plane of an optical exposure system. [SEMI P5-94]

See also:

phosphatidic acids definition
phospholipids definition
phosphatidic acids definition
per acids definition
phosphono definition