Monday, September 10, 2012

How to Identify Tempered Glass from Non-Tempered Glass



I overheard one of our sales representatives talking to a customer. The customer wanted to learn how to identify tempered glass from non-tempered glass.

Our sales rep joked with the customer saying, “Take a hammer to it. If it busts into hundreds of tiny pieces, then it was tempered.”

Of course, few people want to purposely shatter a large piece of glass. (Well, I did. However, that’s a story for another time.) There are less destructive ways to be able to identify whether the glass has been tempered.

First, here’s a lesson about how tempered glass is made. Take a piece of annealed glass-glass that was allowed to cool slowly during the manufacturing process. Reheat the annealed glass in a furnace and cool quickly using forced air drafts.

A little known fact for the glass novice is that holes cannot be drilled into tempered glass. Most types of drilling would cause the glass to shatter. Holes, notches and/or carvings must be made before the tempering process.

Anyway, let’s get back to identifying tempered glass. If your glass is coming from the manufacturer, they are required to etch a tempered or safety glass identifier in the four corners.However, that's not always the case.

Another way to identify tempered glass is to view the glass through a pair of polarized sunglasses. In many cases, viewing the glass in sunlight, through polarized lenses, will reveal dark lines or spots. These are prime indicators that the glass is tempered. The lines are formed by the machine rollers during the cooling process.

Finally, look for dimples, bending or warping. These imperfections are caused during the heating process. Tongs used to remove tempered glass from heat often leave small impressions in the glass that can identified if you look closely.

57 comments:

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  4. I am so glad I came across this wonderful post! I have always been unsure of the difference between non-tempered glass and tempered glass. In Westmont, IL I have noticed that more and more people are preferring tempered glass. Thanks for sharing!

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  6. I had no idea that you could tell tempered glass apart from normal glass like that. Thanks for the post.

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  8. Great post. I was always having confusion between tempered glass & non tempered glass, but your post helped me to distinguish between them. Thanks for sharing!

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    1. Shut up with that hindi/punjabi crap this is America!...

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  10. another way is to put your phone into a microwave for 2 minutes, temperatured glass with not feel hot after the 2 minutes, while normal glass will feel hot. Make sure you take the battery out to prevent expolisions. After you take the battery out its safe to put into the microwave

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  11. another way is to put your phone into a microwave for 2 minutes, temperatured glass with not feel hot after the 2 minutes, while normal glass will feel hot. Make sure you take the battery out to prevent expolisions. After you take the battery out its safe to put into the microwave

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    1. How is it safe to put phone in microwave when it has metal internal parts?

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    2. He was making a joke, that some people might take seriously. It is also known as trolling. You must be new to the internet.

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    3. Please do not do this...this is a joke. Someone should remove this. Many arent as internet saavy and may take this as fact.

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    For me having dyslexia and just being a little slow sometimes I still didn't get it at the reading this forum and everybody's comments but right after I found this YouTube video that was the most simplest form of explanation that could be given which was if you put your laptop monitor behind the glass and if you have the 3D glasses you get the theaters or wherever he put the 3D glasses on and you should see the black lines that someone else described in another comment and that would be the tempered glass and if you put it in front of a non tempered glass again your laptop monitor you'll see no black lines

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