Originally Posted by Schafphoto
THIS IS INCORRECT. For those who can read Japanese, the data sheet for Acros sheet film, including 4x5 QL, is here:
It states clearly that the base is 0.180mm polyester.
The Fujifilm USA website does not have the datasheet for Acros sheet film, only the datasheet for Acros roll film, which is, of course, acetate. The only sense I can make of this is that the Fujifilm USA helpdesk staff simply reached for the nearest data sheet, read "cellulose triacetate", and didn't know enough to understand that sheet films are almost always on a different base.