CRT implosions - test-drb@ccmp.vtda.org

4 Oct 2005

...
  Interestingly, that info implies that it's the
steel strap
 around the perimeter of the CRT's face which does the implosion
 protection, and that the laminated faceplate is purely an
 additional protection against scratches etc. 
Glass is very strong under compression but not strong under tension,
the forces on an unbanded CRT leave the glass on the outside edge of
the face under tension as the forces from the air pressure on the back
and the front of the envelope are concentrated there. The steel band
compresses the whole tube so that no part of the glass is under
tension.

That said I do have tubes that don't have this band but they are all
shallow angle tubes, much less than 60 degrees.

...
  So that article alone suggests that the faceplate
isn't there
 to stop debris at all 
The faceplate is there to stop debris, it really doesn't need to be
any thicker than the rest of the envelope but is made so that if the
envelope fails it will be inside the set that the failure happens.

Lee.

.

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