This oxirane, also known as (R)-(+)-Methyloxirane, presents as a colorless to almost colorless characteristic-smelling liquid. It is known to be miscible with water and many organic solvents as well as soluble in water. Keep container tightly closed and store in an explosion-poof refrigerator. For optimal safety, store under inert gas and locked up - this substance is air-sensitive. (R)-(+)-Propylene Oxide is incompatible with oxidizing agents and extremely flammable in liquid and vapor form. It is harmful if swallowed and toxic in contact with skin or if inhaled. This chemical causes skin irritation, serious eye irritation, and may cause an allergic skin reaction.