Hexabromocyclododecane (HBCD) is a flame retardant chemical of potential concern.  Its primary application is used as thermal insulation in the building industry.  Other uses are upholstered furniture, automobile interior, textiles  and car cushions.  The EPA has identified the chemical as persistent in the environment. Also according to the EPA human exposure is evidenced by the presence of HBCD in breast milk, adipose tissue and blood.  People may be exposed to HBCD from products and dust in the home and workplace.