Your link is malformed; it should start with "http://" but it starts with "ttp://". In any case, I was able to look at the datasheet & it doesn't provide a lot of useful information. The film is medium speed but that doesn't translate directly to an ISO/ASA film speed; as noted elsewhere in this forum you'll need to do film speed tests yourself to determine the film speed. And remember that x-ray film speed changes under different lighting conditions due to its narrow spectral sensitivity.
The only other noteworthy data are that it is high contrast (most or all x-ray film is) and fine-grained, and that it comes in a variety of sizes.
Regarding the film holders, you're better off (for now, at least) with a standard film holder sized appropriately for your camera or reducing back. You'll find Regal, Lisco, Fidelity Deluxe, Riteway, Eastman Kodak, and Toyo are all readily available. I prefer the Toyo holders as they are very precisely manufactured and they weigh less than some of the older holders, but any of these will work.
Here is a discussion of film holders from this forum.
Since you'll probably be cutting down larger film to fit your holders, remember that the nominal size is a bit larger than the actual film size needed to fit. For instance, 4″×5″ film is actually closer to 3⅞″×4⅞″. I put white tape on my paper cutter to act as a guide when I'm trimming x-ray film.
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