[Al Skierkiewicz]

Joe,
The MSDS sheet is not a deciding factor.
"Teams should provide MSD Sheets for any materials they use that might be considered questionable during Robot Inspection."
The 'safe' materials are those that are not only safe for the students on the teams but also for those on the field, i.e. refs, field resetters, judges, VIPs, etc. While acrylic is not specifically banned, an unsafe part of a robot can be questioned.