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Thread: How to tell if glass is tempered.

  1. #1

    How to tell if glass is tempered.

    You can use almost any white LCD screen and a polarized filter to determine if a sheet of glass is tempered.



    Most LCD screens have a polarized filter set at a 45 degree angle across the screen. This is why when you look through polarized sun glasses and tilt your head one way(poarized filter on screen and sunglasses are lined up) the screen gets brighter and when you tilt your head the other way (polarized filter on screen and glasses are perpendicular)the screen goes almost completely dark. This will work with almost any LCD screen...small cell phone LCDs as well as Laptop LCDs. A very few LCDs do not have this type of filter. If it goes dark when you tilt your head one way or the other while wearing polarized sunglasses then you can use it to test your glass.
    This works because the stress in the tempered glass causes light to polarize in a pattern within the glass. Some people can see this as "color patterns" when sunlight passes through tempered glass. I have never been sure what to look for and so could never be sure if glass was tempered. A clear way to see if glass is tempered is to place a white LCD screen (notepad maximized) behind the glass and look at the Screen through a polarizing filter.

    If the glass is tempered it will look like this view through the bottom:



    If it is not tempered it will look like this view through the side panel:


  2. #2
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    Very, very good information! Thanks for sharing that great tip!
    "Oftentimes it's wiser to be silent and thought a fool as opposed to opening your mouth and removing all doubt...."
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  3. #3
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    Cool...never seen that method...great post!

  4. #4
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    So is the 120 glass?

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    Is the tank temperred? I was told it probably was, but the manufacturer didn't know for sure because we ordered ALOT and they had to use both regular and temperred to complete the order.

  6. #6
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    Hey that may not be as reliable as the drill test, but is surely cheaper ;)

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    Cool, I might have finally found a good use for my cell phone.

  8. #8
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    very useful method.

  9. #9
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    Excellent example... A pair of polarized sunglasses will give you a similar result.
    Last edited by jkcoon; 12-26-2011 at 06:53 AM.

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