Is the unbonded glass on the FBP thicker than the glass that's used on a bonded tube?
On the early sets that uses a separate piece of glass the glass was thick and tempered, in some cases laminated, very tough stuff.
I have a Setchell Carlson that uses a glass cover, not bonded to the tube, just tped to it around the edges.
I've always felt such a situation would just add to the flying glass if it ever did manage to get broken but I guess the idea is to prevent the CRT from taking a direct hit from flying objects, possibly a Rolling Pin in the event of a family argument.
I remember once when I was a kid I was messing around with an old Transistor Radio, somehow the Ferrite rod in the antenna got broken and went flying, it hit the CRT of our 19" RCA B&W portable (no safety glass) hard enough to put a small nick in it.
