I applied through university. I interviewed at Solvay (Phila, PA) in Oct 2020
Interview
5 hour long interview with at least 10 different people. This included a panel interview, HR, a "plant tour", discussion with new FFFs, and a safety quiz. Overall it wasn't too difficult.
I applied through university. The process took 1 day. I interviewed at Solvay (Houston, TX) in Oct 2018
Interview
the interview day consisted of a hour and a half facility tour, followed by lunch, then a 2 hour 5 person panel interview, 30 minute individual interview, back to the panel room to ask them questions, then finally a 30 minute technical interview