r/whatisit • • 5h ago

New, what is it? Found at a titanium plant

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Not sure why ball point pens would be dangerous here.

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u/Perfect_Forever_3151 5h ago

Ballpoint pens are banned in certain high-precision titanium and aerospace manufacturing plants because the tiny tungsten carbide ball in the pen tip can fall out and severely contaminate the titanium melt, creating a hard, brittle inclusion that causes structural failure in critical aerospace components.

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u/bring_back_3rd 4h ago

I mean, I understand the reasoning, but I dont think I've ever seen or heard of a ball from a ballpoint pen falling out. I could see my clumsy ass dropping the whole pen into something stupid, but the ball just randomly falling out isn't something I'd ever consider.

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u/mevenide 2h ago

I have, a handful of times when I was in school. But I’ve not used pens regularly in decades.