CAD Computers have been used since the 1950's. Computer Aided Design was introduced in the 1980's to solve complicated engineering problems. CAD is fast and can be manipulated easily. Ink-jet and laser printers combine with computer generated drawings. CAD must meet preservation standards for both media and support.
PET scratches easily, the toner can flake, and comes off in water.
PET drafting films for original drawings and reproductions range in thickness from 2 to 20 mil, are translucent so they can readily be copied or printed, have a chemically or physically prepared matte surface, and a layer to accept drafting with a hard pencil or ink. Preservation of originals and photo-reproductions depends on conditions of processing, storage, and handling. Preservation of photographically processed originals and photo-reproductions depends in large part on the care taken during processing. All images must be properly fixed and all processing chemicals washed out to obtain archival photo-reproductions. Manufacturer Clear polyester drafting films are available from manufacturer with emulsion on one side.