Drilling glass.

[Airphotog]

I had some old tanks laying around that I broke up to recycle and when I hit a couple of the they had tempered glass. One had it on the back and one on the bottom. My question is how do you tell if the back is tempered or not? I don't want to shatter it.

 

[Chichas01]

there have been a couple threads on here about testing for this but I can't find them right now. This link shows up in most from what I remember:
http://www.salt-city.org/showthread.php?t=9542

 

[mcoomer]

If they break, they were tempered. Next!

 

[ac7av]

You can use polarized sunglasses to tell. The tempered glass will have a strange looking pattern to it where with non tempered glass will look clean.

 

[dieden]

Cool solution ac7av!

 

[DonW]

You have to use sunlight to see the full affect. They are called quench marking. They will look like heavy shadows or even rainbows.

Don

 

[Airphotog]

I have seen that in the rear windows of cars on a sunny day.

 

[Frankie]

Did not know about the glasses. Good info!
Another way to tell is by looking at a laptop screen through the glass. You will see the quench marks then also.

 

[FreakinReefin]

I had some old tanks laying around that I broke up to recycle and when I hit a couple of the they had tempered glass. One had it on the back and one on the bottom. My question is how do you tell if the back is tempered or not? I don't want to shatter it.

Heavens to Betsy!! Don't break them! If they are still good tanks let us know and we may be able to find a use for them. I know I can always find some crazy use for old tanks...either custom sumps or even frag tank systems.

 

[Airphotog]

Heavens to Betsy!! Don't break them! If they are still good tanks let us know and we may be able to find a use for them. I know I can always find some crazy use for old tanks...either custom sumps or even frag tank systems.

They were cracked.