anyone work with glass ? how to tell tempered or not?
- Thread starter Linesider
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BrassMonkey
Member
a cheap diy polariscope is to buy a set of polarized glasses , pop one of the lenses out and put it behind what you want to look at while wearing the glasses.
so it would sandwich like, light,lens,suspect glass, glasses.
so it would sandwich like, light,lens,suspect glass, glasses.
Young Frankenstein
New member
and what is the result? what to look for ?:spin2:
Young Frankenstein
New member
a simple explanation will do if you please 
Linesider
Member
what im i looking for? i tried it with a pair of sunglasses(polorized) didnt see anything..
who is the tank maker here
ok, put an LCD screen on one side of the glass. Has to be LCD, it is a polarized light source. Then get the polarized sunglasses and stand on the other side of the glass. You should she horizontal stress marks (discolorations) in the glass.
In order to tell if the sunglasses in question are polarized, rotate them while looking through them at the LCD. At a given angle, (usually 90 degrees), the LCD screen will disappear from your view.
In order to tell if the sunglasses in question are polarized, rotate them while looking through them at the LCD. At a given angle, (usually 90 degrees), the LCD screen will disappear from your view.
BrassMonkey
Member
here is a better explanation from another fourm. ive used this method on glass work to make sure it annealed properly, not to check for tempered glass.
2 polarized lenses. cameras often have these (the lens is able to rotate)
good sunglasses have them.
1 light source (flashlight or mini lamp)
take a lens, put it over the light.
take 2nd lens, put it near your eye. rotate either lens until the light gets dark. as the polarization lines become perpendicular, the light is blocked by the 2nd lens.
put glass inbetween the lenses.. clear stuff works well
the dark bands you see are stress.. look at a point.
i only bring this up, because bigles and i finally got around to trying it. there are better ways.. but.. if you have these lying around, it's neat to see.
z--seth
2 polarized lenses. cameras often have these (the lens is able to rotate)
good sunglasses have them.
1 light source (flashlight or mini lamp)
take a lens, put it over the light.
take 2nd lens, put it near your eye. rotate either lens until the light gets dark. as the polarization lines become perpendicular, the light is blocked by the 2nd lens.
put glass inbetween the lenses.. clear stuff works well
the dark bands you see are stress.. look at a point.
i only bring this up, because bigles and i finally got around to trying it. there are better ways.. but.. if you have these lying around, it's neat to see.
z--seth
MikePowell
New member
I'm not sure that's a way to check for tempered glass. Polariscopes are only used (to my knowledge) to check to see if the glass has been annealed properly after heating it up. What kind of glass are you looking at? Is it a glass sheet or a whole tank? What are the dimensions of the glass? Also are you wantig to drill it?
Brassmonkey- do you work with glass?
Brassmonkey- do you work with glass?
stymee69
New member
If a piece of glass or even steal is annealed then it is NOT tempered. Tempering is a process of heating up and cooling down rappidly (if you would like I can explain the whole process)you can believe that because I have opperated a glass tempering oven in a past job. same question applies though is it part of a tank or a sheat of glass in question?and if it is a sheat of glass what is the source?
Young Frankenstein
New member
Usually the bottom is tempered, remember tempered is more $ to make, i would call the manufacturer, or even petco etc they will tell you, that's what I did in the past and it worked.
Hmm, not sure. When I did this with my old 55 I used my laptop's lcd screen. LCDs are nice to use because they are polarized AND a source of light. I definitely saw the stress lines.
