2,4,2',4'-Tetrabromodiphenyl Ether-13C6 is an isotope labelled analog of 2,4,2',4'-Tetrabromodiphenyl Ether. 2,4,2',4'-Tetrabromodiphenyl Ether, is one of the Polybrominated di-Ph ethers (PBDEs), which are a new class of global, persistent, and toxic contaminants. It is used as Brominated flame retardants (BFRs) in various consumer products.