What regulatory guidelines apply to 4-Chloro-1-butyne (CAS: 51908-64-6)?

4-Chloro-1-butyne (CAS: 51908-64-6) is classified as a hazardous chemical under the Globally Harmonized System of Classification and Labelling of Chemicals (GHS). It falls under the PBT category, which requires strict handling and disposal procedures. In the European Union, it is regulated under REACH, and manufacturers and importers must register and report any releases. FDA and EPA have specific guidelines for its use and disposal, including registration requirements and environmental protection measures.