Extek 3441 Silver Duplicator for Acetate Film

The Extek 3441 is a silver duplicator designed specifically for copying acetate base microfilm. Unlike conventional silver duplicators it has no vacuum chamber: the film runs over a glass cylinder and belt, similar to a Diazo duplicator.

Speed and exposure are both variable, so damaged acetate film affected by vinegar syndrome can be duplicated at a low, controlled speed of about 25 ft per minute, preserving its content on new film before it degrades further. The comparable speed for polyester film is 300 to 350 ft per minute.