Aqua top 12gallon tempered?

[Give tanks]

I'm just bought one of these guys and what to drill some 1/2" bulk heads but not sure if they are tempered or not? Does anyone know

 

https://www.aquatop.com/high-clarity-bookshelf-style-aquarium-12-gallons-825x354x95.html

 

1sr post btw 

[Give tanks]

Also I've tried to email and call and get no answer

[Naekuh]

Take a pair of Polarized glasses and look at the glass in the sun.  

 

 

 

Also if im not mistaken low iron glass typically is not tempered.... But i would still do the polarized glasses test as its a sure way to know.