Safety
Aerogel safety depends on the material from which it's made, so an aerogel will have the same carcinogenic and toxic characteristics as the solid component from which it is derived.
Silica-based aerogels are not known to be carcinogenic or toxic. However, they are a mechanical irritant to the eyes, skin, respiratory tract, and digestive system. They also can induce dryness of the skin, eyes, and mucous membranes. Therefore, it is recommended that protective gear including gloves and eye goggles be worn whenever handling aerogels.
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