Well, no, the video didn't state anything at the front or anyplace else, because there was no dialogue at all. You read the stuff printed on the protective paper covering on the plastic and knew what it meant. I was busy getting rid of the damned banner ad or fiddling with the sound level, most likely.
Same guy made a plastic backplate so he could see what was going on at the crank and rod. Didn't show much but a blurr and a lot of liquid splashing around. I was most interested in seeing if the face of the plastic would be scuffed up by the conrod, but it wasn't, or at least not noticeably.
It did not state in the (non-existent) dialogue that it is acrylic sheet, but I did read it on the protective sheet where it was printed "12mm acrylic". And the fact that it stated the material (acrylic) is pretty much all there is to know about it. It has been a really common material for many years used for airplane canopies, art projects, and many other uses.