Thanks for your replies, Fuji Acros is in fact on a Polyester base and it is acceptable by HABS. The photographers at the National Park service had the same problem with the Fuji Staff not knowing their own film but also eventually came to the same conclusions, after doing research in Japanese. In cold storage with proper washing it should last over 500 years. You can see my HABS work on my website www.habsphoto.com most was shot on the Fuji Quickloads for ease of transport and lack of dust.
Architectural and Documentary Photography