24 Oct
2011
24 Oct
'11
10:32 a.m.
Tony Duell wrote:
Indeed it is. I wonder if a CRT with the frotn glass removed, but covered
with this material would be safe?
Maybe. They do say "3M Fragment Retention Security Films secure glass in
place during blast, seismic, shatter or 'smash and grab' events" - so I
suppose it depends on what their definition of 'blast' is.
Good point.
I'm surprised there's not a risk of air pockets becoming trapped then,
though. Perhaps it was done under vacuum conditions - which might make it
hard to replicate in a DIY environment.
I'm liking Chuck's window film suggestion more and more, because even if it
can be done without trapping air, there's no guarantee that whatever
substance is used won't deteriorate 5 or 10 years down the line - and I'd
rather not chance whatever modern bonding stuff was used being even more
difficult to remove than the original.
cheers
Jules
If one wanted real implosion protection, it might be
worth
investigating some of the mylar window films made for the purpose of
containing fragments:
http://windowfilmdepot.com/protection.htm
That's an interesting idea! I wonder how
critical it is to fill the gap between the CRT and faceplate
with something, though? For the HP 250 it was a non-functional display, but
on a working screen will there be problems if there's any air trapped in
there (blooming or reflections off the back of the faceplate, for example)
There might be slight reflections, but no worse than with the separate
safety glass used in 1950's TV sets. In the case of your HP250, even thoguh you are not
running it it could
still be an implosion risk without the correctl-bonded faceplate.
Hmm, I wonder if it's worth worrying about - I suspect that the chance is
so small that other threats are far more likely, but still...
I don't
know how the faceplates are/were normally stuck in place at
assembly - did they apply bonding compound to the front of the CRT and then
press the plate into it, or did they suspend the plate in front of the CRT,
seal around the edges, then pour/inject the bonding compound into the
resulting gap?
ALmost certialy they applied the bonding stuff to one of the parts (which
one I can't say) and then put them together.