Fuji Single 8 was on a poly base, but with the same format as Super 8. this let them use smaller cassettes with 50 ft loads. the cassettes only will hold 30 some feet of the conventional 5 mil film. I don't believe that fuji ever offered a super 8 film, at least under their own brand....
Ilford Once tried to sell "HP5 Motor Drive Film" using a thin poly base to cram 72 exposures into a standard 35mm cassette. Freestyle had great bargains on it when it went out of date! the Ilford folks had even had a special 72 exposure Stainless tank made, as well as a cute Plastic 72 exposure reel to fit a regular Stainless tank. I probably still have a roll of it at the bottom of my film freezer. The Poly base made for negatives with a lot of tendency to curl.
Sorry, yes thats what I meant. You could hold more footage on your reels with single 8 film, but Fuji still only kept 50 feet on their cassette to keep size down. Im interested to know how well it projected as I know what happens with various film bases in some projectors.
I also know that Wittner-Cinetec had to make modifications to their Super8 cartridges to allow the thinner AGFA Aviphot stock to run through them properly.
Im not sure how much thinner the Agfa stuff was, but ive got a bulk roll of their CN200 that im loading onto 35mm canisters and I can put over 40 exposures on the roll which means i get more shots developed per roll for the same price as a 36 exposure roll!
Yes I do remember reading about Ilford selling 72 exposure rolls.
I dont know why this idea never took off, because you would think having as many shots per roll would be a good thing.