| ▲ | _aavaa_ 13 hours ago |
| Hard enough to not fly out accidentally but weak enough that people can break them on purpose so they're not trapped inside. |
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| ▲ | Johnny555 12 hours ago | parent [-] |
| I think there's an impossibly thin line between making glass that's easy to break through on purpose, but hard for a high speed head to break through in an accident. |
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| ▲ | stavros 11 hours ago | parent | next [-] | | I'm fairly sure that the two lines are way past each other, on the wrong side. The force with which you'll be flung against the glass is much higher than what you can punch. | | |
| ▲ | _aavaa_ 8 hours ago | parent [-] | | This isn’t about punching, it’s about using one of those handheld devices with a pointed metal tip. |
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| ▲ | AngryData 6 hours ago | parent | prev [-] | | Most tempered glass does it just fine and has for decades. |
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