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modern CRTs (starting in 1964 but mostly 70s onward) with tensioned rimbands are usually quite safe, you can throw a rock at them or hit them with a hammer and they would just fracture and slowly lose their vacuum without imploding
the only way to implode them is to smash them face-down on the floor, but even then most of the glass remains within a few feet.
Of course, a CRT with a missing or weakened rimband (rusted away...) is a real time bomb!
Older unprotected CRTs, the ones with separate safety glasses or bonded lenses are a lot weaker and far more likely to implode when disturbed, and they usually throw larger shards at higher speeds...
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