I did and reported on it sometime back. I put a sliver in a glass of water and left it for three weeks (replinishing the water from time to time). I checked the results with a caliper accurate to 0.001 inches.
The soaked material was 0.004 inches thicker than the virgin material. I've also tried to drive a finishing nail into it, attacked it with a wood rasp, and offered other insults. That shit is impervious.
They ought to cover the space shuttle with it or make bullet-proof vests from the stuff.