I am trying to think of a single type of film still available off the shelf that is acetate and cannot.
You can special order acetate from Kodak in motion picture emulsions, but you have to buy 100,000 feet minimum if there are no remaining stocks ...
I have used a bit of 35mm motion picture film. All of the film I have come across recently appears to be acetate. It is easily torn if required....essential in my experience loading a motion picture film magazine. My understanding is that acetate is also essential as it will tear not strip the $200K movie cameras gears.
Did not see the question for me : So sorry for the delay
We coat miniature and roll film on tri-acetate, sheet film on polyester :
We would never coat miniature or roll on polyester, due to the hightened
possibility of camera damage, polyester does not tear and therefore in our
opinion is not suitable for a camera film base, so we do not use it.
POLYESTER is OK for lots of other miniature applications such as aerial / surveillance
etc. etc. and its thinner so it has other advantages in certain applications
Regards Simon ILFORD Photo / HARMAN technology Limited :
I have seen camera damage as posted here and elsewhere.
Kodak follows the same guidelines as Ilford in film base use. The only place polyester is used is in space photography where weight and film length is of concern. Kodak coated on 2 mil (0.002") support or thinner to meet NASA specs.
I agree with you concerning the 35mm format : if it can't tear, you can damage camera. But in 120, what is the problem?
To avoid damage on motorized 120 backs?
Using film since before it was hip.
"One of the most singular characters of the hyposulphites, is the property their solutions possess of dissolving muriate of silver and retaining it in considerable quantity in permanent solution" — Sir John Frederick William Herschel, "On the Hyposulphurous Acid and its Compounds." The Edinburgh Philosophical Journal, Vol. 1 (8 Jan. 1819): 8-29. p. 11