Ceramic cant handle water? Interesting
What about sweat?
You should research it yourself, but I was in the coast guard, and we were told that they should not be submerged in salt water or chlorinated pools (after the events detailed below).
So we had steel plates and all was good. Then we got issued these new ceramic plates in ~2007. The CG was so afraid that we would fall in the water and drown with all this heavy gear on (one guy did drown during a training exercise
https://www.google.com/amp/s/piloto...b950fd46-a229-547a-8286-7fe762532120.amp.html ) so they made us do quarterly swimming and gear ditching drills every three months to stay qualified to do nighttime tactical boardings. So, once every three months, we all had to get in a swimming pool, swim laps in full kit, then practice ditching the plate carrier by removing it underwater, and treading water for 30 minutes or so. We had been doing this swim for several years, with steel plates... But then we got the ceramic plates and kept doing the pool training, but within 6 months (two trips to the pool) all of the ceramic plates started peeling apart and disintegrating.
So the unit quickly recalled the ceramic plates, returned them all, and made us go back to wearing steel plates because we had to keep doing the quarterly pool recertifications.
So, ceramic plates are fine with sweat, but they should not be submerged in water. And they are brittle, so you have to be careful not to drop them. They can easily crack. If a bullet hits in the exact spot where the crack is, it can zip right through and penetrate the wearer.