Pentabromobenzyl bromide

Pentabromobenzyl bromide (CAS 38521-51-6, EC 253-985-6) is a brominated aromatic flame retardant also known commercially as FR 706 and by the synonym 2,3,4,5,6,α-Hexabromtoluol. It carries six bromine atoms per molecule, giving it a high bromine content that underpins its flame-retardant performance.

This compound is used as a reactive or additive flame retardant in engineering plastics, printed circuit board laminates, and automotive components. It functions by releasing bromine radicals during combustion, which interrupt the free-radical chain reactions that sustain a flame, reducing heat release and slowing fire propagation through the polymer matrix.

Pentabromobenzyl bromide is supplied for industrial and formulation use and falls under REACH registration obligations within the European Economic Area. Procurement teams should confirm current SVHC status and applicable restrictions before specification. Standard packaging formats and available grades should be confirmed directly with the supplier at the time of inquiry.