Water or CO extinguishers must never be used on sodium and potassium hydride fires . Reactivity and Incompatibility Potassium hydride and sodium hydride react violently with water, liberating hydrogen, which can ignite. Oil dispersions of these hydrides are much safer to handle because the mineral oil serves as a barrier to moisture and air. Potassium hydride may react violently with oxygen, CO, dimethyl sulfoxide, alcohols, and acids. Explosions can result from contact of these compounds with strong oxidizers.
Potassium hydride is generally more reactive than sodium hydride.
Safety glasses, impermeable gloves, and a fire-retardant laboratory coat should be worn at all times when working with these substances. These hydrides should be used only in areas free of ignition sources and should be stored preferably as mineral oil dispersions under an inert gas such as argon. In the event of skin contact, immediately wash with soap and water and remove contaminated clothing. If potassium hydride or sodium hydride is ingested, obtain medical attention immediately. If sodium hydride dust is inhaled, move the person to fresh air and seek medical attention at once.