(Not to be confused with Dioxin)

Dioxane is a type of chemical compound. Dioxanes have a ring of atoms made of four carbon atoms and two oxygen atoms. Depending on where the oxygen atoms are, there are three isomers of dioxane. Larger compounds that have the dioxane ring structure are also sometimes called dioxanes.
There are three isomers of dioxane, depending on where the oxygens are. The different oxygen locations make different functional groups on each isomer, giving them different chemistry.
The National Toxicology Program says [that there is reason to believe, that the chemical can cause cancer in people, or it is] "reasonably anticipated to be a human carcinogen". The IARC says that the chemical is possibly carcinogenic to humans because it is a known carcinogen in other animals.