Al-Li alloys are a series of alloys of aluminium and lithium, often also including copper and zirconium. Since lithium is the least dense elemental metal, these alloys are significantly less dense than aluminium. Commercial Al-Li alloys contain up to 2.45 wt% lithium

Stable. Incompatible with steel, aluminium, copper, zinc, bases, strong oxidizing agents.

a dental caries prophylactic, NaF; used in the fluoridation of water and applied topically to the teeth.