lamination is actually an insulation? >> it's not. if you put a piece of plastic in between those two pieces of glass, essentially the heat goes right on through and so does the cold. >> and so does noise by the way. >> i'm talking more about having a thermal break like some window companies have a thermal break in their system so there's outside and inside aluminum. >> the thermal break is plastic that they use in those windows but it doesn't give you the same performance that an air gap do does. and talking about acoustics, it's very -- one of the great misconceptions is that insulated glass, with that air space, gives you acoustical protection, when in fact it does not. it's not what you use for an acoustical problem. what you need -- i mean what's giving you some protection there is the fact that you've got two layers of glass. but the sound beneficiary -- beh pieces of parallel, the sound goes right on through. what you need is a piece of laminated glass -- your best insulating for sound is a piece of laminated on both sides, and an air space, or just a reall

but it's essentially like a sheet plastic, but of a different configuration, and extra clear, that they laminate between pieces of tempered glasses. those pieces in the tanks are about that thick. and they are slanted so that they can't see glare. and what we have to do in a tank, or -- on the inside, where you are shooting from, is you have to put a laminated piece of glass or plastic to the inside. because the impact of a bullet going towards that glass won't penetrate, but the force of it will create the inside glass to spall. so you've got this sprintering of glass -- splintering unless you have this on the inside to keep you safe. >> what ems have you got here? >> well, since we're talking about... laminated glass, let's go for -- let's start with maybe patterned glass. patterned glass -- almost all of it starts off as eneeled glass. these are bathroom windows which you'd expect to see, but almost always it's eneeled unless it's in a shower bath or in a hazardous location. as it is, it's going to break the same way that ordinary glass does. and you just can go right on up through the spectr