Make search on all book about plasteel (who is the hi tech material of SR...).
Find it's THE hardening material and read a lot of info on it:
"plasteel railing", "plasteel walls", "plasteel-reinforced", "plasteel shield", "Plasteel component", "Plasteel Homunculus"...
But find nothing about is Barrier Rating...!!!
so
Anybody knows is armor and structure Rating?
After read Barrier Rating Table (166 SR4a), i suposed it between "heavy Structural Material" and "Hardened Material" but that all...