Precautions
Titanium is non-toxic even in large doses and does not play any natural role inside the human body. Zirconium powder can cause irritation, but only contact with the eyes requires medical attention. OSHA recommends for zirconium are 5 mg/m3 time weighted average limit and a 10 mg/m3 short-term exposure limit. Only limited data exists on the toxicology of hafnium.
Read more about this topic: Group 4 Element
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