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

so a lot of times, we do tempered glass on both sides, and plastic lamination, or whatever, in between. actually, what we prefer to do is -- i put heat strengthened glass, which we haven't really talked about, and tempered on the other side. heat strengthened glass is glass that is kind of tempered. you know, it's tempered, but not fully tempered. it's got kind of a half measure. stronger than eneeled glass and will take more impact. but where we saw the big piece of glass broken into shards the heat strengthened glass will break into shards maybe this size. the tempered glass, as you see, broke into teeny pieces. so if both sides were tempered and it broke, you know, this whole thing would peel -- you know, would fall over, you know, with this plastic in between, if it didn't have the century guard that -- the new depont stuff which is going to keep it rigid. but if we used heat strengthened on one side and tempered on the other, the two will still remain rigid. >> i want to thank you all for coming. i want to thank ken paige for this extremely exciting and illuminating adventure toda

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

laminated. >> or plaque. >> there's an interesting new product, and i don't know if you're been dealing with it, you probably have, which is two layers some kind of glass, with a film of plastic, but it's actually an intoo mess ens material and as it heats up, it foams up and forms a fire protective barrier within the glass. you can use these glazing units as a wall. they're actually not windows, they're walls. and we've seen this being used around san francisco, so that you have a fully rated, tested wall, that might be a one-hour wall, which is your typical property line wall, which is transparent, until there's a fire, when it changes, foams comes up. >> is that the kind of glass you would use for a balcony if you wanted to see through and have a protective shield? >> no. you don't want to use that product if you don't want to because it's inexpensive. >> i've heard it's $60 a quair foot. is that anywhere near -- >> no. you know, this can be closer to twice that, anyway. >> really. >> and so the -- and it would require a special frame. it requires a steel frame. for a balcony, what you would expect to see is half inch tempered glass. and that's really not very expensive. a