The Globally Harmonized System of Classification and Labeling of Chemicals (GHS), also called the “Purple Book” focuses on the classification of chemicals by the types of hazards that they present. It also proposes standard hazard communication elements such as labels and safety data sheets. This publication aims at ensuring that information on physical hazards and acute toxicity from chemicals is made available, in order to enhance the protection of human health and the environment during the handling, transport, and use, of these chemicals. The GHS also provides a basis for harmonization of rules and regulations on chemicals at national, regional and world-wide level, an important factor for trade facilitation. This publication is extremely useful for national and regional governments as well as for those in industries that will ultimately implement the requirements that have been adopted.