So I got one of those bullet resistant windows that sit in front of the teller at a bank. It came out of a remodel up the street from my job. It is 1-1/4 acrylic of some sort. It is large enough to give me a 5.5 foot by 2.5 foot window once I cut off the damaged corner. I know there are many types of acrylics out there, is there any way to tell what this is or if would be safe to use for a plywood tank build? The only "test" that we've done is taken a smaller piece from the same job site and tried to test if it was actually bullet resistant(okay, it was more fun than testing)