Para,
The XC116 is stiff but pliable before heating it, and stiffer, less pliable after. I found it to be brittle and fragile after the heat treatment. It was easy to break it apart with little effort using only my hands, no tools.
I used it any way. While using it in my iAtty, occasionally for various reasons I would drain the tank into an empty bottle and take care of what ever task I was doing, and then pour it back into the tank.
I started to think about these particles and fibers, it occurred to me that I should save a sample of this used liquid for a better inspection. The liquid looked dirty to me, with small grey colored flecks. After letting it sit over night these flecks had settled to the bottom of the bottle. I poured the liquid out and wiped the bottle out with a tissue, flecks were in my juice. I rinsed the bottle clean and repeated the process each time I drained the tank. These flecks were real, not a singled out instance.
So after posting these concerns someone suggested applying a filter to the mouthpiece to prevent them from being ingested. I did this with mesh screen, as well as carto filler, even tissue. Thats when I realized all of the liquid is being ingested, every mil, and what ever is in it. The filters plug up almost instantly with liquid, and they ruin the vapor completely.
Still I used it, everyone else is and still are, until I started to cough and breath heavy. I put every effort into minimizing the risks that I had proven existed to myself, only to acquire a nice respiratory hack at every effort.