At a glance
| Chemical family | Chlorinated organophosphate flame retardant (OPFR) |
| CAS number | 13674-87-8 |
| Classification | California Proposition 65 — known to the State of California to cause cancer (2011); EPA Toxic Substances Control Act prioritized chemical; not yet classified by IARC at the global level |
| Where you encounter it | Polyurethane foam in mattresses, sofas, upholstered furniture, automotive interiors; house dust; baby products manufactured before flame-retardant regulation changes |
| Sleep micro environment relevance | Migrates from foam into house dust and onto skin surfaces during contact; metabolite BDCPP is detectable in urine of essentially all US populations tested; firefighter urinary BDCPP rises significantly after fire response |
| Activated carbon capture | High — granular activated carbon and activated carbon fiber cloth both adsorb TDCPP effectively; the compound's log Kow (≈3.7) and SVOC behavior make it a good capture target |
What it is
TDCPP is a viscous, slightly yellow liquid that is added to polyurethane foam during manufacturing to meet flammability standards. Unlike DEHP (which plasticizes PVC), TDCPP is mixed into the foam during the polymerization reaction. It is not chemically bonded to the polymer matrix — it sits in the foam structure as an additive — which means it migrates out over time through abrasion, contact with skin and dust, and partitioning into other materials.
The compound came into widespread use as a replacement for PentaBDE, the polybrominated diphenyl ether mixture that was phased out of US manufacturing in 2005 after evidence of bioaccumulation, developmental neurotoxicity, and ubiquitous house dust contamination. The chlorinated tris replacement was widely adopted across the furniture industry because it was effective at meeting California's flammability standard TB117 (the de facto national standard at the time) and was substantially cheaper than alternatives. The pattern that followed has been recurring in the flame retardant category: regulatory pressure removes one compound, the replacement turns out to have its own concerns, and the replacement chemistry then comes under scrutiny.
The 2012 Duke University study by Stapleton and colleagues examined 102 polyurethane-foam-containing samples from couches purchased between 1985 and 2010. The study found that 41% of post-2005 samples contained TDCPP. Peer-reviewed — Stapleton 2012, DOI 10.1021/es303471d Subsequent and broader surveys reported up to 52% prevalence in post-2005 furniture foam. The chemical was added to California's Proposition 65 list in 2011 — meaning California identified it as known to cause cancer — and TB117 was revised in 2013 to allow furniture to meet flammability requirements without chemical flame retardants. The combination of these two events reduced new addition of TDCPP to furniture foam, but the existing reservoir in already-manufactured products continues to drive exposure today.
How it gets to the bedroom
From the mattress foam itself
TDCPP added to polyurethane foam during manufacturing migrates out of the foam over time through three mechanisms: direct partition into adjacent air, transfer to dust accumulating on the foam surface, and direct transfer to skin and bedding during contact. Boor 2015 documented chamber emission rates from polyurethane crib mattresses for the related compound TCPP at 0.012 µg/m²/h. Peer-reviewed — Boor 2015, DOI 10.1021/acs.estlett.5b00039 TDCPP emission rates have not been measured under identical conditions but are expected to be comparable based on similar physicochemistry.
From house dust
TDCPP is detectable in essentially all US house dust samples tested. Concentrations are typically in the range of hundreds to thousands of ng/g, with bedroom samples often higher than other rooms due to the concentration of foam-containing furniture and bedding in sleeping areas. Peer-reviewed
From firefighter occupational exposure
A 2021 study by Fent and colleagues measured urinary BDCPP (the primary TDCPP metabolite) and DPhP (a related OPFR metabolite) in firefighters before and after fire response. Both metabolites rose statistically significantly post-fire. Peer-reviewed — Fent 2021, PMC8325627 The exposure source includes both combustion of flame-retarded materials and direct contact with TDCPP-treated foam in fire scenes. The relevance for the sleep environment is that firefighter take-home contamination on clothing, skin, and equipment can transfer TDCPP and related compounds to home surfaces including the bedroom.
From other foam products in the room
A bedroom often contains multiple polyurethane foam sources beyond the mattress itself — pillows, mattress toppers, upholstered headboards, foam-cored cushions, soft toys. Each contributes additional TDCPP to the room's combined load. The mattress is typically the largest single source by volume of foam, but the cumulative load matters more than any single source.
What the research says
Documented health effects
TDCPP was added to California's Proposition 65 list in 2011 as a chemical known to the State to cause cancer. Regulatory The Prop 65 designation was based on multiple animal studies showing tumor development at chronic exposure levels relevant to environmental contamination scenarios. The EPA's TSCA program designated TDCPP as a chemical of concern in 2015, and EPA risk evaluations have flagged neurodevelopmental effects, endocrine disruption, and liver toxicity in animal models.
The compound has been associated in epidemiological studies with reduced thyroid hormone levels and altered semen quality at higher exposure levels. Peer-reviewed The dose-response relationship at typical residential exposure concentrations is an active area of research, and the literature is still developing.
Bedroom-specific evidence
The 2021 Fent firefighter study established the post-exposure rise in BDCPP urinary biomarker following fire response. This is not a residential bedroom study but it establishes the dermal and inhalation pathways are operative at occupationally relevant exposure intensities. Peer-reviewed The translation from occupational exposure to residential bedroom exposure has not been quantified — the compound concentration in residential bedrooms is meaningfully lower than at fire scenes, but the exposure duration (8 hours per night, every night) is meaningfully longer.
For firefighter populations
Firefighters represent a population with documented elevated TDCPP exposure both from occupational sources (foam in fire scenes, contaminated turnout gear) and likely from home environments where take-home contamination is documented for other compound classes. The contribution of fire-hall bunk room exposure to total firefighter TDCPP body burden has not been specifically studied.
For parents of infants and young children
Children sleeping on foam mattresses or crib mattresses manufactured before California's 2013 TB117 revision are exposed to the legacy reservoir of TDCPP in the foam. Crib mattresses specifically have been a regulatory focus because of children's elevated per-body-weight exposure and longer contact times. Peer-reviewed The Boor 2015 study modeled infant exposure scenarios specifically and flagged crib mattresses with TDCPP-containing foam as a higher-concern exposure source.
What helps reduce exposure
Identify what's in your mattress. Mattresses manufactured after 2014, when California's TB117-2013 took effect, are less likely to contain TDCPP because the flammability standard no longer requires chemical flame retardants to be met. Mattresses manufactured 2005–2013 are the highest-likelihood TDCPP cohort. The law tag and the manufacturer's disclosure are the only reliable ways to know. "No flame retardants added" claims should be verified — some manufacturers use this language while still meeting flammability requirements through chemical means in some components.
Choose alternative flame barrier materials when replacing. Wool, rayon, and modacrylic flame barriers meet flammability requirements without chemical flame retardants. Mattresses certified GOTS, GOLS, or MADE SAFE generally use these alternatives. CertiPUR-US certification specifically excludes TDCPP from the foam component — but does not address fire barrier composition. Regulatory / certification framework
Reduce dust accumulation. HEPA-filtered vacuuming, regular wet-mop of hard surfaces, and washing soft furnishings reduce the dust reservoir of TDCPP. Dust is the primary non-foam exposure pathway. The combination of HEPA filtration and regular dust removal has been documented to reduce house dust OPFR concentrations in residential studies.
Ventilate the bedroom. Foam off-gassing concentrations accumulate in closed sleeping areas overnight. Fresh-air exchange dilutes accumulated TDCPP and related OPFRs in the breathing zone. HVAC recirculation does not perform this function; actual outdoor air infiltration does.
For firefighter households: decontaminate turnout gear and shower before sleeping. The documented occupational health practice of post-shift decontamination reduces take-home transfer of TDCPP and related compounds to home surfaces. Keeping turnout gear out of sleeping areas is part of the body-burden reduction protocol established in the occupational literature. Peer-reviewed
What does NOT help
- "CertiPUR-US certified" alone does not mean the mattress is free of all flame retardants. CertiPUR-US prohibits TDCPP in the polyurethane foam — but the certification covers only the foam component. The mattress can still contain a fire barrier with different chemistry. See our piece on what CertiPUR-US actually tests for.
- "Flame retardant free" claims without disclosure of the fire barrier material. Federal flammability standards must be met somehow. If the manufacturer cannot explain how, the most likely answer in budget-tier mattresses is fiberglass; see our piece on fiberglass in mattresses. Other alternatives include wool, rayon, modacrylic, or aramid fibers.
- Spraying foam with sealants or covering it with vinyl. Vinyl coverings can introduce other chemistry (phthalates — see DEHP) and don't prevent foam off-gassing from continuing inside the cover.
Open research questions
- The contribution of residential bedroom TDCPP exposure to total body burden over typical mattress lifespan (8–10 years) for adults and children, versus dust and other source pathways. Speculation — the compound is documented in the bedroom; the bedroom-specific contribution to body burden has not been quantitatively partitioned
- Fire hall bunk room TDCPP contamination — gear-storage proximity to sleeping areas creates a hypothetical elevated-exposure environment that has not been measured. Speculation
- The capture efficiency of activated carbon fiber cloth for TDCPP at the sleep-surface interface, under body-heat and body-pressure conditions. This is one of the chamber-test protocols Embr's research program proposes. Speculation — broader OPFR-AC adsorption chemistry is documented; sleep-surface application has not been measured
Citations
- California Office of Environmental Health Hazard Assessment (2011). Proposition 65 listing — Tris(1,3-dichloro-2-propyl) phosphate. Regulatory
- Stapleton HM, Sharma S, Getzinger G, Ferguson PL, Gabriel M, Webster TF, Blum A (2012). Novel and high volume use flame retardants in US couches reflective of the 2005 PentaBDE phase out. Environmental Science & Technology 46(24):13432–13439. DOI 10.1021/es303471d Peer-reviewed
- Fent KW et al. (2021). Volatile organic compound off-gassing from firefighter personal protective equipment and post-fire urinary metabolite measurements. PMC8325627 Peer-reviewed
- Boor BE et al. (2015). Identification of phthalate plasticizers, flame retardants and unreacted isocyanate monomers present in polyurethane foam for use in infant beds. Environmental Science & Technology Letters. DOI 10.1021/acs.estlett.5b00039 Peer-reviewed
- EPA TSCA — TDCPP risk evaluation. Regulatory
- California Bureau of Electronic and Appliance Repair, Home Furnishings and Thermal Insulation. Technical Bulletin 117-2013. Regulatory
- CertiPUR-US Program Standards. certipur.us/program-standards Industry certification
Frequently asked questions
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Is TDCPP in my mattress?
Possibly. The 2012 Stapleton study found TDCPP in 41% of post-2005 furniture foam samples; broader surveys have reported up to 52%. If your mattress was manufactured between 2005 and 2014, there is a meaningful probability it contains TDCPP. Mattresses manufactured after 2014 — when California's TB117-2013 came into effect — are less likely to contain it because the flammability standard no longer requires chemical flame retardants. The law tag and the manufacturer's material disclosure are the only reliable way to know.
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What is "chlorinated tris"?
"Chlorinated tris" is a common name for TDCPP. The compound shouldn't be confused with "non-chlorinated tris" or "brominated tris" — they're different chemicals with different toxicological profiles. The "tris" part refers to the three propyl phosphate groups in the molecular structure.
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Was TDCPP banned in children's products?
TDCPP has been restricted in children's products in some jurisdictions but not banned nationally in the US. California listed it on Proposition 65 in 2011 as a known carcinogen, which created labeling requirements. New York and Maryland have passed restrictions on flame retardants in children's products that include TDCPP. The CPSIA does not specifically restrict TDCPP at the federal level.
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Does CertiPUR-US cover TDCPP?
CertiPUR-US prohibits TDCPP in the polyurethane foam component it certifies. It does not certify the fire barrier or other non-foam components of the mattress. A mattress with CertiPUR-US-certified foam can still contain other flame retardants in different parts of the construction. Industry certification
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Are TCEP and TCPP the same as TDCPP?
No — different compounds, related chemistry. TCEP (tris(2-chloroethyl) phosphate, CAS 115-96-8) and TCPP (tris(1-chloro-2-propyl) phosphate, CAS 13674-84-5) are also chlorinated organophosphate flame retardants in the same family, but they have different chlorine substitution patterns and different toxicological and physicochemical profiles. All three are flagged in various regulatory frameworks. CertiPUR-US prohibits TCEP and TDCPP in certified foam; TCPP is subject to fewer restrictions.
Related compounds
Embr Sleep is a sleep environment company researching and addressing the chemistry of the bedroom. Our work on flame retardants focuses on capture at the sleep-surface interface — work that is in research and product development.
Last reviewed 2026-05-15. If you find a factual error, contact us.