A CDC report from 2015 identified ammonia as number two among the top five chemicals associated with injury (from 1999-2008). To improve the safety of workers around ammonia refrigeration piping and system components, the International Institute of Ammonia Refrigeration (IIAR) has a guideline for labeling them, to provide consistency with general ammonia pipe marking standards. Read on to learn more about meeting IIAR standards for ammonia pipe marking.