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Glass.com's Daniel Snow teams up with Dustin Anderson from Anderson Glass in Waco, TX to find out what happens when tempered glass breaks and what can cause tempered glass to break "spontaneously".
Transcription:
Daniel: So we're here to break some more glass! What do we have today?
Dustin: So this is an insulated unit. This is essentially what most windows are made up of. It's two pieces of glass with a spacer in between that creates dead air space, and that's what insulates it.
Daniel: So this basically what you would find in a residential home for people's windows?
Dustin: Absolutely. Also in a commercial setting; very similiar process. So this pieces of glass is actually a safety glass. It's tempered. Both sides are actually tempered. So it takes a really good shot. It's rigid. But it's point sensitive, which is why we've given you this fun tool to break it with.
So when it breaks- and it doesn't break like a regular piece of plate glass in big pieces- it breaks into small pieces so if it were to fall on you, obviously it doesn't hurt you as bad. So why don't you show us what happens when you break tempered glass.
So what's really cool about tempered, for me, is that you can typically tell where it breaks from. So it actually spiderwebs from the location. Now, this will continue to crack. It will continue to break.
Daniel: Yeah, we can actually hear it right now.
Dustin: You can hear it, right. And then eventually it will fall out. So tempered glass breaks into these small pieces. Will these cut you? For sure. This can definitely still cut you. It's still glass. But the reality of it is, this doesn't cut you as bad, or can cut you as bad, as what the larger pieces do.
So when tempered glass breaks, it breaks into small pieces. We noticed earlier when you hit it, that you kind of bounced off a time or two, right? You didn't necessarily put much swing into it. Well, tempered is point sensitive because there's energy trapped inside, but it's also edge sensitive. So what I want to let you do, is I want you to hit the edge of it. But instead of using a point, I'm going to let you wrench it around and see what you can make happen.
Daniel: Alright, let's see what happens.
Dustin: Give her a shot!
Daniel: So you can see it's just kind of like a little chip right there.
Dustin: For sure. Now here's an interesting piece of this- a lot of times you find or hear of glass breaking spontaneously, right? Spontaneous glass breakage. Something like this can actually cause this piece of glass to break in six months, or in a year. And if that got chipped at some point during the process of making it, and it still got installed, that can explain some crazy day where this piece of glass blows up.
Daniel: And that's actually really common in the automotive world with sunroofs especially. Those are a lot of times made of tempered glass. People say that they'll just be driving down the road and all of a sudden the sunroof explodes.
Dustin: Yea, it's just one of those things that's really hard to explain and if you try to put a story behind it, there's really no telling. But that right there can cause an issue for sure down the road.
Daniel: Alright, so let's take another stab at it...It's tougher than it looks!
Dustin: Alright, there you go. So with the right amount of force and hitting it at the right angle definitely causes the issue of having it come apart. The other beauty of this is, we didn't have the back side to hold it in, so you saw that one actually came apart. Similiar story with the sunroof exploding. So there you have it man, that's kind of how the whole tempering process works.
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