Nope. The identity of the film is only given as “Polyolefin film” by FLIR and I detailed what was meant by FLIR by Polyolefin.
Beyond that, it will be for you to determine whether common Polyolefin heat shrink film as detailed in this thread will meet your specific needs. You will not find an exact specification of film used by FLIR so it is a case of buying some films and testing them. Not being flippant but the chemical make up of the material is of little to no interest to me, or many users, beyond how the film performs in a given situation. That said, if you have specific needs then regrettably you will have to do quite a bit of research into which polymer films will meet your needs. There are some research papers on Polyolefin film transmission and absorption plots. Sadly some are behind pay walls
Can you say why the materials chemical composition is important in your use case please ? The properties that I needed were as follows:
1. A thin film that may be placed over a frame to mount in front of a lens
2. Excellent transmission at sensible film thicknesses
3. No serious absorption bands from the material within the required band of use
4. Robust enough for a lens protector
5. Low cost
6 Easily obtainable
7. Heat shrinking an advantage but not essential characteristic
When I asked my friends at FLIR about their disposable lens protectors, they told me that they use Polyolefin film similar to that used in the food packaging industry. I searched for food packing Polyolefin film and discovered that it is very common, very nice surface quality, heat shrinkable and very transmissive at LWIR and MWIR wavelengths. It looked perfect for my application and no, I did not delve into what it’s chemical make-up was as it just worked and met my needs. That said, I did step down from thicker films to the 12micron and 15micron that I now use. This decreased the transmission loss through the film without the lens protector becoming too fragile.
There are other plastic films that are transmissive at LWIR and MWIR but Polyolefin heat shrink food and product packaging is such a great fit for my needs that I have not tested other materials. So much depends upon your specific needs. In some cases you cannot avoid buying a very expensive non-disposable lens protector that uses a Germanium (LWIR & MWIR) or Sapphire (MWIR) PL-PL AR coated window. You have to sit down when asking FLIR for the price though !
If looking for some of the film, just go on eBay and search for “Polyolefin shrink film” and you will find the film on spools and in bag form. It is used for food wrapping so is very common. It can be hard to buy in smaller quantities. I found a small company willing to provide sensible quantities at low cost some years ago….. a little goes a long way when dealing with small diameter lens protectors !
Hope this helps
Fraser