Answered: Polycarrbonate on robpots vs acrylic plastic

At a recent competition teams were using acrylic or plexiglas on the robots. One of our teams has the Lexan polycarbonate in use on the robot. What is ruling for this? should it be a point of contention?

Rule <R7f> of the VEX Gateway Game Manual details the allowable use of polycarbonate.

This, acrylic and plexiglass are not legal, while polycarbonate is legal.