Flame Retardants: What They Are and Why They Matter

Picture the path a flame retardant takes from a sofa to a child's bloodstream. It starts in the foam inside the cushions, where it was added during manufacturing to meet flammability standards. Over years, the foam slowly off-gases the chemical into the air and sheds particles that settle into household dust. The child crawls on the floor, plays on the sofa, touches surfaces, puts hands in their mouth — the normal behaviour of a toddler. And with that normal behaviour, they ingest dust-bound flame retardant chemicals at rates that, in some studies, have been shown to exceed adult acceptable daily intake levels.

This pathway — product to dust to ingestion — is one of the defining features of persistent organic pollutants in the home. The chemicals don't stay in the product. They migrate into the environment where people live, concentrate in the dust that settles on every surface, and enter the body through pathways that no one is consciously choosing to create.

The story of flame retardants in furniture is particularly instructive because it involves a regulatory requirement — fire safety — that was met through chemistry that turned out to cause more harm than the fire risk it prevented. Understanding how this happened, what replaced the original chemicals, and what you can do now is one of the more important chapters in the home toxin story.

The polybrominated diphenyl ethers — PBDEs — were the dominant flame retardants in upholstered furniture, electronics, and building materials from the 1970s through the early 2000s. By 2004, research had accumulated to the point where the US voluntarily phased out penta- and octa-BDE formulations (the ones most concerning for health), followed by the deca-BDE formulation in 2012.

PBDEs were phased out. They were not replaced by a safety vacuum — they were replaced by other chemicals, some with their own concerns.

The PBDE legacy Despite the phase-out, PBDEs are persistent — in the environment, in wildlife, and in human bodies. They bioaccumulate through the food chain and have been detected in breast milk, blood, and tissue across the global population. The health associations include thyroid disruption, neurodevelopmental effects (lower IQ, attention difficulties in children with higher prenatal PBDE exposure), and some reproductive effects.

The replacements The chemicals that replaced PBDEs include: • Chlorinated tris (TDCIPP): Used extensively in polyurethane foam after the PBDE phase-out. Classified as a probable human carcinogen by California's OEHHA. Detected in children's blood and urine at significant concentrations. • Organophosphate flame retardants (OPFRs): A diverse group including TCEP (phased out) and TPHP (still in use). Some OPFRs show endocrine disruption in in vitro and animal studies; human health evidence is still developing. • Halogen-free reactive flame retardants: The most promising alternatives — chemically bonded rather than added, so they don't migrate as readily.

Children are disproportionately exposed to flame retardant chemicals through dust ingestion — and the exposure pathway is largely invisible to parents.

The dust pathway in detail Flame retardant chemicals in foam and electronics are semi-volatile — they don't evaporate as readily as VOCs, but they do slowly migrate to the surface of products and partition into dust particles. In a home with FR-treated furniture, household dust concentrations of PBDEs and chlorinated tris can be substantial. Studies measuring children's hand-wipe samples have found FR residues at levels that, modelled for daily ingestion, exceed the reference doses set by toxicologists for adults.

Highest-risk products for children: • Car seats and booster seats: foam products subject to California's strict flammability standards, historically among the highest FR-treated items in contact with children • Nursing pillows, infant bouncers, and floor play mats: dense foam items in frequent infant contact • Upholstered furniture in rooms where children spend the most time • Foam mattresses and toppers

The California TB 117 history California's Technical Bulletin 117, in effect from 1975 to 2013, required furniture foam to pass an open-flame test that practically required chemical flame retardants. A 2012 Chicago Tribune investigation revealed that the standard had been influenced by the tobacco industry (which preferred flammable furniture to fire-safe cigarettes) and that the FR chemicals being used were ineffective against real furniture fires. The standard was revised in 2013 (TB 117-2013) to allow smoulder-resistance compliance without open-flame FR chemicals — opening the door to FR-free furniture, though many manufacturers still use them.

You can't eliminate flame retardant exposure entirely — PBDEs are now globally distributed environmental pollutants — but you can meaningfully reduce your household's ongoing exposure from new and current products.

Identifying FR-containing products: California law (Proposition 65) requires furniture sold in California to declare whether it contains flame retardant chemicals. Look for a tag on upholstered furniture — it will state either "This article contains added flame retardant chemicals" or "The flame resistance of this product does not rely upon added flame retardant chemicals."

Choosing FR-free furniture: Ask retailers whether foam products are TB 117-2013 compliant without added FR chemicals. Brands that explicitly market FR-free furniture include Avocado, Naturepedic, and several other natural material manufacturers. GOTS (Global Organic Textile Standard) certified textile products use natural fibres that meet flammability standards without added chemicals.

Managing existing FR-containing products: • Keep foam furniture in good condition — damaged foam that off-gases or sheds more particles represents higher exposure • Use a damp mop and HEPA vacuum to reduce dust accumulation on floors and surfaces where children spend time • Wash children's hands before meals — this addresses the hand-to-mouth dust ingestion pathway directly

For car seats specifically: Car seats are difficult to replace (you need one and there are few explicitly FR-free options that meet safety standards). Minimise children's time in car seats outside the car; ensure good ventilation in the car; replace car seats when they reach their expiration date (typically 6 years from manufacture).