Tempered or not?

Does anyone think this is tempered glass? I need to know before I drill it. Glass is about 1/2 inch and the tank is an O'Dell 220 gallon

 

The only true way to know is to look through it with polarized sunglasses with a screen on the other side and look through it. you will be able to tell if its tempered by doing this. I cant think of how to describle the look....wavy, dotted, etc.....

 

Agreed. No way to tell from a pic.

 

-Sight the stamp on the corner of the fish tank. The stamp may also contain certain other alphabets, qualifying the type and quality of the tempered glass. The letter ‘L’ stands for laminated glass. This signifies that a laminate, such as tint or window film, has been placed on the tempered glass, such as tint or window film. ‘T’ stands for toughened glass that means that the glass has been made stronger through the process of heating and cooling. The rest of the grades would indicate the capacity to withstand weight and pressure, with Grade A, B and C being in the descending order.

-As the tempering process can lead to imperfections, carefully analyze the glass form a 45 deg angle. If there are bumps and waves, then the glass is tempered.

-Whilst utilizing polarized sunglasses, try and look out for black lines. The tempering of the glass, that is heating and rapid cooling results in some black lines. These lines can be seen through polarized sunglasses from an angle of 45 deg.

-If you put your hand in front of the fish tank which is made of tempered glass, then whilst viewing through the polarized glasses then you should not be able to use your hands due to reduction of reflected light.

 

I would say not tempered...If it was, that chip should cause it to shatter...but thats based on my experience with automotive glass

 

I plan do do the laptop test with polarized sunglasses if i can find them anywhere. i just thought that maybe it was regular glass with the chunk taken out of the side. wouldn't tempered glass have shattered?

 

what does everyone else think?

 

Probably not tempered. But I can't tell from just a pic