Tempered glass that I've used is so strong that once I got frustrated and threw a perfectly good 28 X 36 inch raw glass (no added wood or metal edges) down 25 feet to the asphalt pavement only to see it bounce around and come to rest. Amazing. Another time 35 or 40 years ago I worked for a slum collector, and he wanted me to replace all the windows on the ground floor with single-paned tempered glass, for security. He was dead serious about needing a certain level of security, so I tested one of them by banging on it with a baseball bat in a way that would break normal glass. I had to escalate my attacks on that glass until I was throwing two-pound rocks at it, and it would make banging sounds as loud as a gong. If anyone tried to break into that space through the windows, the noise would have awakened the tenants and the neighbors for sure.
Even when you run a sharp glass cutter on the glass to make it shatter, the shattering makes a sound like a gunshot.
But it's almost impossible to get them from contractors who throw them into dumpsters. They say they have an understanding with Anderson, Pella, and the other advanced bands to not give away the seconds or slightly damaged ones so that potential customers won't have access to cheap lightly damaged doors and widows. Plus they suspect that I'm installing them somewhere, robbing them of business. For the customer, the seconds are very desirable because they get a huge discount on them, plus the contractors and handymen charge much less than the manufacturer's premier installation contractors.
I've watched perfectly good "seconds" that were replaced because of minor blemishes that showed up after installation. They go into dumpsters and head for the dump. AARGHHH! The contractors won't let me pull any of them out. BUT
It's worth searching for them because this happens all the time and the reward for continuing to ask eventually lets you get some good dual glazed wood-framed doors and sliding windows. I used to have access to slightly damaged Four Seasons triple-glazed glass panels. Sigh.
I moved twice in recent years, and take with me three very nice but very heavy large dual-glazed panels. It's a pain to keep lugging them around, but I have big plans for them.