11 Stability and Storage ConditionsBenzalkonium chloride is hygroscopic and may be affected by light,air, and metals.Solutions are stable over a wide pH and temperature range andmay be sterilized by autoclaving without loss of effectiveness.Solutions may be stored for prolonged periods at room temperature.Dilute solutions stored in polyvinyl chloride or polyurethanefoam containers may lose antimicrobial activity.The bulk material should be stored in an airtight container,protected from light and contact with metals, in a cool, dry place.