Hexachlorobutadiene (HCBD)

HCBD, Hexaklorbutadien (Hexaklor-1,3-butadien)


Hexachlorobutadiene (HCBD)

CAS no


Chemical formula


 Hexachlorobutadiene (HCBD) is a colourless, almost odourless liquid which main use is as an industrial chemical.1


Hexachlorobutadiene has been used within different industrial applications, such as a solvent in chemical products for textiles, in chlorine production, as an intermediate in rubber production, as a hydraulic fluid and in production of lubricants. Hexachlorobutadiene has also been used as a pesticide.2 3

Sources and transportation pathways

Hexachlorobutadiene does not occur naturally in the environment. In the past, it has been produced for commercial use in for example Germany, but production has since ceased. HCBD is also formed unintentionally during production of other chlorinated solvents such as tri- and tetra-chloromethane.4 Air is an important transportation pathway. If emitted directly to water, hexachlorobutadiene is considered to evaporate to air.5

Effects on environment and health

Hexachlorobutadiene is a substance with persistent and bioaccumulative properties. The substance is acutely toxic and harmful to aquatic organisms.6

Health effects include risk for poisoning by inhalation of fumes and by skin contact with the substance.7

International agreements and regulations

Hexachlorobutadiene is regulated by the UN Convention on Long-Range Transboundary Air Pollution (CLRTAP) and the EU Water Framework Directive (2000/60/EC). The UN Protocol on PRTRs and the EU E-PRTR regulation regulate how data on hexachlorobutadiene emissions is made available.


1 https://rib.msb.se/Portal/template/pages/Kemi/Substance.aspx?id=2773
2 https://rib.msb.se/Portal/template/pages/Kemi/Substance.aspx?id=2773
3 https://www.atsdr.cdc.gov/substances/toxsubstance.asp?toxid=168
4 https://www.atsdr.cdc.gov/phs/phs.asp?id=863&tid=168
5 http://www.eurochlor.org/media/49369/8-11-4-17_marine_ra_hcbd.pdf
6 https://www.kemi.se/prio-start/sok-i-prio
7 https://rib.msb.se/Portal/template/pages/Kemi/Substance.aspx?id=2773