Rep wanted to sell you something! Delrin and Lexan are definitely NOT the same, nor particularly similar to my knowledge. Like I said, I’m not a plastics guy, but we have machined Delrin many times. You’ve probably seen delrin already… many of the “plastic” washers used in the assembly of treestands (to prevent squeaks and rattles)are made of Delrin. It’s a rather slippery plastic. We used to machine “runners” for conveyor lines from it. It’s reasonably tough, but relatively soft. Lexan is a polycarbonate- it’s tough, but relatively hard (by comparison).