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I thought bulletproof materials worked better if you separated them slightl=
y,=20
instead of sandwiching the lexan the energy used to distort the first piece=
=20
of lexan is not used to begin distorting the second piece before the bullet=
=20
reaches it, instead it gets a whole new piece to deal with

im sure i saw something like that when I was a kid, and they were showing h=
ow=20
two smaller plates of metal seperated slightly worked better than a solid=20
piece much bigger

maj
On Wednesday 22 September 2004 05:07, Russell McMahon wrote:
> >From another list:
> >> I'd feel safer screening a [rocket] motor with bulletproof glass. What
> >> does the
> >> sandwiched layer (acts a glue) consist of again_ transparent silicone
> >> resin?
> >> Probably something better.
> >
> > The internal layer in bulletproof glass is Lexan or its equivalent.  The
> > stuff we use is 1.3" thick, so glass would be superfluous.  I've heard,
> > but not confirmed, that this will take three .50-cal rounds in the same
> > spot without failing.  It will certainly take anything we can throw at
> > it.
>
>     I'm not sure about the material you are using but in the past we had
> lots of 1" thick pieces of
> lexan from surplus.  We wanted to find out how bulletproof it really was =
so
> we got a couple of guns
> and about a dozen sheets of the stuff and went shooting.
>
> The 357 mag with hollowpoints was stopped in one 1" sheet with very near
> penetration and some
> distortion on the far side.
> 38 stopped way sooner, so did the 45.  Didn't have a 44 mag.
>
> As for rifles, the jacketed lead 30-06 penetrated a couple of sheets to
> about 2.5"
>
> A 7.62mmX39 steel core round penetrated 5" of lexan.
>
> And in the most telling, the 308 NATO steel core jacketted round penetrat=
ed
> 6" of lexan leaving the
> copper jacket in the first 1" sheet.
>
> So bulletproof glass is NOT bulletproof except from lead core handgun
> rounds until you get VERY
> thick or use a sandwitch construction like glass laminated onto thick
> lexan. You need to mushroom
> the projectile to get it to stop in lexan, if it is poointy and fast it
> will penetrate.
>
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