TDCPP (Tris(1,3-Dichloro-2-Propyl) Phosphate)

At a glance

TDCPP (tris(1,3-dichloro-2-propyl) phosphate), sometimes called "chlorinated tris," is an organophosphate flame retardant. It's added to polyurethane foam to slow combustion — and polyurethane foam is what most modern mattresses, mattress toppers, pillows, and upholstered furniture are made of. California Proposition 65 lists TDCPP as a known carcinogen.

Regulatory & certification status

Where TDCPP sits across the major regulatory systems and the certifications a mattress or foam product might carry. Each row links to the governing instrument; where a jurisdiction has no specific measure, that is stated plainly rather than left blank.

Where you find it

Stapleton and colleagues (2009) tested foam samples from 26 pieces of furniture — couches, chairs, mattress pads, and pillows — purchased in the United States between 2003 and 2009. Fifteen of the 26 contained TDCPP at concentrations of 1 to 5% by weight of the foam. Peer-reviewed

In a follow-up survey of 102 American couches purchased between 1985 and 2010 (Stapleton et al., 2012), TDCPP was the most frequently detected flame retardant in furniture purchased after 2005 (52% of samples). A separate study of 101 baby products — changing pads, nursing pillows, car seat foam, infant sleep wedges — found TDCPP in 36% of products. Peer-reviewed

Major manufacturers pledged to phase out TDCPP between 2012 and 2015, but it remains in any furniture, mattress, or baby product purchased before that phase-out, which means most of the foam in most homes still contains it.

How it reaches the bedroom

TDCPP is not chemically bonded to the foam. It is mixed in, and gradually migrates out — into the air, onto fabric, into dust, and onto skin in contact with the foam surface. Because the bedroom contains some of the highest-concentration foam in any home (the mattress, the pillows, the foam topper, sometimes the headboard), TDCPP concentrations in bedroom dust tend to be elevated. Heat, humidity, and the pressure of body weight all increase the rate of migration. So does normal compression and recovery — every time someone sits, lies, or moves on foam, microscopic amounts of TDCPP are released.

What studies have found in actual bedrooms

Zheng and colleagues (2017) did a particularly bedroom-specific study — they sampled dust from multiple locations within bedrooms: air conditioner filters, bedding, the floor, and window surfaces. Bedding dust had the highest median concentration of organophosphate flame retardants at 2,750 ng/g, including TDCPP. Peer-reviewed

The original Stapleton survey of 50 Boston-area homes found TDCPP in over 96% of dust samples at a geometric mean of 1,890 ng/g. A 2017 study of college dormitories by Dodson and colleagues found TDCPP and related flame retardants in 100% of the 95 dust samples collected. Peer-reviewed

A 2018 Seattle childcare-center study by Salamova and colleagues did an intervention: they replaced flame-retardant-treated nap mats with FR-free mats and measured dust concentrations before and after. Median dust concentrations of TDCPP dropped 42% after the swap. This is one of the clearest demonstrations that the foam product itself is the dominant source of these chemicals in the indoor environment, and that removing the source reduces exposure measurably. Peer-reviewed

What does 1,890 ng/g of dust mean for someone sleeping on or near foam furniture every night?

Unlike PFOA, TDCPP doesn't accumulate in the body for years. The half-life is hours to days — your body processes it and excretes it relatively quickly. But that's not actually reassuring, because the source isn't going away. The foam in your mattress, your pillow, and your couch is continuously off-gassing TDCPP into the dust around it.

The measurable result of this continuous low-level exposure: in adults, the TDCPP metabolite BDCPP is detected in 91 to 100% of urine samples in every published US study. Carignan and colleagues found BDCPP in every one of the 29 office workers they tested. Your kidneys are processing this chemical right now if you live in a typical home with foam furniture. Peer-reviewed

The 2009 study by Meeker and colleagues found a measurable dose-response in adults: men in the highest quartile of household TDCPP dust exposure showed approximately a 3% decrease in circulating free thyroxine and a 17% increase in prolactin compared to men in the lowest quartile. These are small physiological changes, but they're real and they correlate with home dust exposures at the concentrations measured in typical American homes. Peer-reviewed

Translation: the daily intake isn't large enough to be acutely toxic. The body handles it. But the body is handling it constantly, every day, year after year, and the cumulative effect on hormone signaling and thyroid function in adults — and potentially on neurodevelopment in children — is the question current research is trying to answer.

The honest gap

TDCPP is being phased out in newer products, and dust concentrations have been declining slowly since the mid-2010s. However, every older piece of foam still contains it, and the typical lifespan of a foam mattress is 7-10 years. A 2021 California study by Rodgers and colleagues demonstrated that replacing older flame-retardant-treated furniture (or its foam) with FR-free alternatives produced significant declines in TDCPP dust levels within 6 to 18 months. Peer-reviewed The replacement compounds being used in newer foam — including triphenyl phosphate (TPHP) and components of "Firemaster 550" — are less well-characterized but show similar migration and exposure patterns.

What helps reduce exposure

Replace older foam furniture and mattresses with FR-free options when feasible. California's TB117-2013 standard removed the requirement that fabric flammability be met with chemical flame retardants in foam. Furniture and mattresses manufactured to TB117-2013 (which became the de facto US standard) increasingly omit TDCPP. The 2021 California study by Rodgers et al. showed TDCPP dust levels declined significantly within 6-18 months after older furniture was replaced. Peer-reviewed

HEPA-filtered vacuuming reduces the dust reservoir. Bedding dust is where TDCPP concentrates in the bedroom (Zheng 2017). Weekly HEPA vacuuming of mattress surfaces, carpet, and soft furnishings — combined with damp-mop cleaning of hard surfaces — reduces the accumulated TDCPP load. Vacuuming without HEPA redistributes the dust rather than removing it.

Wash hands before eating, especially for children. Hand-to-mouth contact is a documented exposure pathway for organophosphate flame retardants. Peer-reviewed Hand-washing before meals interrupts that pathway and is one of the simplest interventions documented.

Wash bedding regularly. Bedding accumulates TDCPP-laden dust from the mattress beneath it. Weekly washing reduces the surface load in direct skin contact. Does not address the foam source underneath.

For new mattress purchase: look for GOTS, GOLS, or MADE SAFE certification. These certifications prohibit chemical flame retardants including TDCPP in certified products. CertiPUR-US does NOT prohibit all flame retardants — it certifies the foam component itself for a defined list (including TDCPP) but does not address replacement compounds. See what CertiPUR-US actually tests for.

What does NOT help

• "Non-toxic," "eco," or "green" mattress claims without third-party certification. Marketing terms with no enforceable definition. Look for GOTS, GOLS, MADE SAFE, or OEKO-TEX specifically rather than label language.
• GreenGuard Gold certification certifies emissions thresholds but does not specifically prohibit chemical flame retardants in foam.
• Air purifiers without VOC-rated activated carbon. HEPA captures particles; gas-phase TDCPP off-gassing requires SVOC-rated activated carbon filtration.
• Heating the mattress to "off-gas" it before use. Increases emission rate during the heating period but does not deplete the source; the foam continues to off-gas at lower rates afterward.
• Removing the mattress cover. Does not help and may make things worse — the cover acts as a partial barrier between the foam and the breathing zone.

Open research questions

• The long-term cumulative effect on adult thyroid function of continuous low-level TDCPP exposure across a 10-year mattress lifespan, versus the cross-sectional biomarker studies that exist. Speculation — cross-sectional dose-response is documented; the longitudinal study has not been published
• Activated carbon fiber cloth capture efficiency at the sleep-surface interface for TDCPP under body-heat and body-pressure conditions. Speculation — bench-scale adsorption chemistry is documented; sleep-surface application has not been measured
• The toxicity profile of the replacement compounds being used in newer foam (TPHP, Firemaster 550 components) is less complete than that of TDCPP itself. Whether the replacements are net safer is an open question. Speculation — limited animal data exists for replacements; comparative human-relevance studies are sparse

Frequently asked questions

• Is TDCPP in my mattress?

  Possibly. Mattresses manufactured before 2014 are very likely to contain TDCPP in the foam. Newer mattresses built to California's TB117-2013 standard are less likely to contain chemical flame retardants, but the law tag rarely specifies what flame retardant (if any) was used. The most reliable indicators are third-party certifications: GOTS, GOLS, and MADE SAFE all prohibit TDCPP in certified products.

• How can I tell if my mattress contains TDCPP?

  The law tag rarely lists TDCPP by name. Check the manufacturer's full material disclosure if available. For older mattresses (pre-2014), assume TDCPP is present unless documented otherwise. For newer mattresses, GOTS / GOLS / MADE SAFE certification is the strongest signal of TDCPP absence.

• Is TDCPP banned?

  Not federally banned in the US. California Proposition 65 lists TDCPP as a known carcinogen (added 2011), requiring warning labels in California. Major US manufacturers pledged voluntary phase-out between 2012 and 2015. The chemical remains legal in many applications and continues to appear in older products.

• Can I remove TDCPP from my mattress?

  You cannot remove it from the foam itself — it's distributed throughout the polymer matrix. You can reduce the dust transfer pathway with HEPA vacuuming, weekly bedding washing, and a non-PVC mattress cover acting as a partial barrier. The most effective intervention is replacing the mattress with an FR-free alternative.

• What replaces TDCPP in newer foam?

  Common alternatives include triphenyl phosphate (TPHP) and components of the Firemaster 550 mixture. Some manufacturers meet flammability standards without chemical additives, using inherently flame-resistant fabric layers or barrier materials. The replacement compounds are generally less thoroughly studied than TDCPP itself.

Related

Articles

• Boric acid (borate) — the non-halogenated flame barrier marketed as avoiding chlorinated tris
• TBBPA — the world's most-used brominated flame retardant (IARC 2A)
• HBCD — a Stockholm POP brominated flame retardant in upholstery back-coatings
• DBDPE — the current brominated flame retardant rising in house dust
• Mattress Off-Gassing: How Long Does It Actually Last?
• Is Your Mattress One of the Ones With Fiberglass?

Atlas

• TCPP
• TPHP
• TBOEP
• BDE-209
• Antimony trioxide
• TCEP — the closest chlorinated-tris sibling; another Prop 65 flame retardant that sheds from foam into dust

Embr is a sleep environment company researching and addressing the chemistry of the bedroom. Our work focuses on capture at the sleep-surface interface under body-heat conditions — work that is in active research and product development.

Last reviewed 2026-05-22. If you find a factual error, contact us.