system
Given the following post, respond as if you're commenting on Reddit:
human
Why isn't fiberglass as dangerous as asbestos seeing as they are both fairly similar fibers?
gpt
fiberglass is man made, we melt and make glass into thin strands (1-10 micron usually).

Asbestos naturally forms extremely tiny crystals which are a lot smaller than fiberglass.

Fiberglass is still really dangerous and you shouldn't abrade it without proper ventilation and PPE.  We have a carbon fiber shop at work that does carbon and fiberglass, and we treat both of them pretty much like asbestos.  lots of containment, PPE etc.

you can't breathe in fiberglass unless is it abraded, since the fibers are usually really long.  Some silicate powder is used for filler in resin to lay up fiberglass as well, and that stuff is just about as bad as asbestos.

really any form of solid material that can be respirated (diameter and length < 5µm) is bad for you to inhale.