This epoxide, also known as s-epoxypropane, presents as a colorless to almost colorless liquid. It is known to be miscible in water, ether, and ethanol. Keep container tightly closed. Store in an explosion-poof refrigerator for optimum safety practices. This substance is heat sensitive. (S)-(-)-Propylene Oxide is incompatible with oxidizing agents and is extremely flammable in liquid and vapor form. This chemical is toxic in contact with skin or if inhaled. It causes skin irritation, serious eye irritation and may cause an allergic skin reaction, genetic defects and cancer (S)-(-)-Propylene Oxide is also suspected of damaging fertility or the unborn child and may cause respiratory irritation, drowsiness or dizziness.