A harmful concentration of this gas in the air will be reached very quickly on loss of containment. Reacts with water to form hydrogen fluoride and silicic acid. Attacks many metals in presence of water releasing hydrogen. The substance is corrosive to the eyes, the skin and the respiratory tract. The effects may be delayed.
Medical observation is indicated.
TLV not established. The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort.