A restricted-substance list arrives from your largest customer, or a procurement screen flags one line in your foam formulation, and the entry is a chlorinated phosphate ester: TCEP, TCPP, or TDCPP. The grade has cleared your fire test for years. Now someone in compliance wants to know whether you can still buy it, ship it into a given market, and put it in a product without a warning label or a recall risk. The honest answer is that it depends on the exact substance, the jurisdiction, the end use, and the date, because the status of all three is moving. Before you commit to a reformulation budget or sign off on a continued purchase, it pays to see the regulatory picture laid out neutrally, with the sources and the dates attached.
The short version: TCEP, TCPP (also written TCIPP), and TDCPP (also TDCIPP, the substance commonly called “chlorinated tris”) are three chlorinated organophosphate flame retardants used historically as additives in flexible polyurethane foam, furniture, textiles, and coatings. None of the three is subject to a blanket worldwide ban, but each faces real, substance-specific regulatory action that varies by jurisdiction and end use. In the US, the EPA finalized a TSCA risk evaluation for TCEP on September 23, 2024, determining it presents an unreasonable risk to human health and the environment, and is moving to risk management; the EPA assesses TCEP, TCPP, and TDCPP together as a chlorinated phosphate ester cluster. California lists TCEP (1992) and TDCPP (2011) under Proposition 65 as carcinogens, and California law restricts certain flame retardants, including these, above 0.1% in some new consumer products. In the EU, TCEP is a REACH substance of very high concern on the Authorisation List, and all three were grouped in an ECHA screening review. The status below is current as of mid-2026 and is actively changing, so confirm it for your jurisdiction, substance, and application before you rely on it. This article reports regulatory status only; it makes no health, safety, or efficacy claim about any of these substances.
What TCEP, TCPP, and TDCPP are
All three belong to the same chemical family: trialkyl phosphate esters carrying chlorine on the alkyl chains, which is why they sit in the halogenated bucket despite a phosphorus backbone. They were used as additive flame retardants, blended into a polymer or foam rather than chemically bonded to it.
| Common name | Other names | CAS | Historical use |
|---|---|---|---|
| TCEP | tris(2-chloroethyl) phosphate | 115-96-8 | Flexible and rigid polyurethane foam, textiles, coatings; largely displaced over time |
| TCPP | TCIPP, tris(1-chloro-2-propyl) phosphate | 13674-84-5 | Rigid and flexible polyurethane foam, the highest-volume of the three; commercial product is an isomeric mixture |
| TDCPP | TDCIPP, “chlorinated tris,” tris(1,3-dichloro-2-propyl) phosphate | 13674-87-8 | Flexible polyurethane foam in furniture and some childcare articles |
Two points orient the rest of this guide. First, the three are similar enough that regulators tend to assess them as a group, so action on one is a signal about the others. Second, they are not interchangeable in the market: TCEP was largely phased out and replaced in part by TCPP and TDCPP, so “we don’t use TCEP” does not by itself settle a chlorinated-phosphate-ester question. Identify the exact CAS in your formulation before you map it to a regulation.
The regulatory status, substance by substance
The table summarizes the major US and EU actions per substance. Treat it as a map to the primary sources, not a substitute for them, and read every cell as “status as of mid-2026, confirm current.”
| Substance | US EPA (TSCA) | California Prop 65 | EU (REACH / ECHA) |
|---|---|---|---|
| TCEP | Final TSCA risk evaluation released September 23, 2024: unreasonable risk to human health and the environment; risk-management step underway | Listed as a carcinogen, effective April 1, 1992 | On the REACH Candidate List (SVHC) and the Authorisation List (Annex XIV); use in the EU requires authorisation |
| TCPP (TCIPP) | Assessed in the EPA chlorinated phosphate ester cluster under the TSCA Work Plan; no final TSCA risk evaluation as of this writing | Not on the Prop 65 list as of this writing | Subject of an EU harmonised classification (CLH) proposal for reproductive toxicity; included in ECHA’s 2018 cluster screening |
| TDCPP (TDCIPP) | Assessed in the EPA chlorinated phosphate ester cluster under the TSCA Work Plan | Listed as a carcinogen, effective October 28, 2011 | Included in ECHA’s 2018 cluster screening; grouped with TCEP and TCPP for review |
A few details behind the cells. The EPA’s September 2024 TCEP determination is the furthest-advanced US action of the three: a finalized “unreasonable risk” finding under TSCA triggers a risk-management rulemaking, the stage where actual use restrictions are written. TCPP and TDCPP sit earlier in the process, assessed within the chlorinated phosphate ester cluster rather than carrying their own final risk evaluations. In the EU, TCEP is the only one of the three on the REACH Authorisation List, so any grouped EU restriction on TCPP and TDCPP would take a separate regulatory step. The dates are the load-bearing facts; the labels around them will move as the rulemakings advance.
What the toxicology bodies have reported
Beyond the regulatory listings, the US National Toxicology Program studied TCPP directly. In NTP Technical Report 602, published in 2023, the NTP reported clear evidence of carcinogenic activity for an isomeric mixture of tris(chloropropyl) phosphate (TCPP) in female mice, based on liver tumors, and some evidence in male and female rats and male mice. California’s Proposition 65 listings of TDCPP and TCEP, in turn, rest on findings that those substances caused cancer in laboratory studies.
This article does not interpret those findings, assign a hazard level, or make any health claim; it records that the studies are part of the public record regulators cite. If a toxicological endpoint matters to your decision, read the primary report and the current Safety Data Sheet for the specific grade rather than a summary.
Are these flame retardants banned?
Not as a blanket category, and “banned” is the wrong word for most of what is happening. The accurate picture is a set of substance-specific and use-specific restrictions layered on top of broad risk assessments.
The clearest outright restrictions are at the consumer-product level in specific jurisdictions. California, for example, restricts the sale of certain new consumer products, including some upholstered furniture, mattresses, and juvenile products, that contain covered flame retardants such as TCEP and TDCPP above 0.1% by weight, as described in the state’s flame-retardant guidance. In the EU, TCEP’s place on the REACH Authorisation List means its use is prohibited after a set date unless a specific authorisation is granted, a use-by-use control rather than a market-wide ban of the molecule. The EPA’s TCEP risk-management step will define the US restrictions, but the specifics are still being written.
For a formulator, “is it banned?” is the wrong question. The answerable ones are: which exact CAS is in my product, which market is it sold into, which end use applies, and what is the threshold and the date.
What it means for a formulator
The direction of travel is consistent even where the individual timelines differ: chlorinated phosphate esters are under sustained, group-level regulatory pressure across the US and EU, and the burden of proof is shifting onto the user to justify continued use. Three actions follow.
- Inventory by CAS, not by trade name or family. Map every flame retardant in your formulations to its exact CAS number and cross-check it against the EPA TSCA actions, the Prop 65 list, and the REACH Candidate and Authorisation Lists. A family-level “phosphate ester” label hides whether you hold TCEP, TCPP, TDCPP, or a non-chlorinated ester with a very different status.
- Track the rulemakings, not just the current list. TCEP’s risk-management rule and any grouped EU action on TCPP and TDCPP will move the picture on a known schedule. Set a review trigger on the EPA, OEHHA, and ECHA pages for the substances you use, and treat the status as a date-stamped snapshot.
- Cost the reformulation option before you are forced into it. Qualifying a non-chlorinated alternative on your own system is cheaper as a planned project than as an emergency response to a delisting or a customer specification change.
The non-chlorinated alternatives, and the honest trade-offs
If your assessment points toward moving off a chlorinated phosphate ester, the most common substitution is a non-chlorinated phosphorus ester or a mineral or intumescent system. One caution comes first, and it is the point of this section: switching off a chlorinated grade does not automatically mean a lower-hazard product. “Non-chlorinated” and “halogen-free” are chemistry descriptors, not safety or environmental verdicts. Each phosphate ester carries its own hazard classification, regulatory status, and performance profile, and several non-chlorinated phosphorus esters are themselves under review. Confirm the status and suitability of any replacement for your specific application.
With that framing, the non-chlorinated phosphate-ester options RawSource supplies cover the common reformulation routes. For low-viscosity and foam systems, triethyl phosphate (TEP) carries phosphorus efficiently where viscosity is the constraint. For rigid and engineering thermoplastics, solid triphenyl phosphate (TPP) preserves stiffness, while liquid cresyl diphenyl phosphate (CDP), 2-ethylhexyl diphenyl phosphate (DPOP), isopropylated triphenyl phosphate (IPPP), and tricresyl phosphate (TCP) double as plasticizing flame retardants in PVC and engineering blends. For intumescent coatings and polyolefins, ammonium polyphosphate (APP) anchors a char system where the base polymer will not char on its own.
The trade-offs are real. Non-chlorinated phosphorus chemistries are generally less efficient per unit than the chlorinated grades they replace, so a substitution often means higher loading, a synergist or multi-component package, or a shift in plasticization and processing behavior. We cover those reformulation gaps in our guide to halogenated versus non-halogenated flame retardants, the underlying chemistry in what a flame retardant is and how the types work, and how to screen candidates by oxygen index in our note on the Limiting Oxygen Index.
What RawSource supplies, plainly
We do not supply TCEP, and we keep it out of our catalog. We do supply one chlorinated phosphate ester, tris(1-chloro-2-propyl) phosphate (TCPP), widely used in polyurethane foam and carrying the chlorinated phosphate ester regulatory considerations described above; it is a halogenated flame retardant, not a halogen-free one. Alongside it, we supply the non-chlorinated phosphate-ester range above (TEP, TPP, TCP, CDP, DPOP, IPPP, and the intumescent APP) for industrial manufacturing and coatings formulators in drums, IBCs, and bulk, with CoA documentation. Tell us your base polymer, your governing fire-test standard, your target rating, and your constraints on loading, plasticization, and regulatory status by market, and request a sample to qualify a substitution on your own compound rather than on a literature value.
Frequently asked questions
Is TCEP banned?
There is no single worldwide ban on TCEP, but it faces substantial substance-specific regulation that varies by jurisdiction and use. In the US, the EPA finalized a TSCA risk evaluation on September 23, 2024 determining that TCEP presents an unreasonable risk to human health and the environment, and is developing risk-management rules. California lists it under Proposition 65 as a carcinogen (effective 1992) and restricts it above 0.1% in certain new consumer products. In the EU it is a REACH substance of very high concern on the Authorisation List, so its use requires authorisation after a set date. Confirm the current status for your jurisdiction and application.
What is TCPP used for?
TCPP (also written TCIPP, tris(1-chloro-2-propyl) phosphate, CAS 13674-84-5) is a chlorinated phosphate ester flame retardant used mainly as an additive in rigid and flexible polyurethane foam, and it is the highest-volume of the three chlorinated phosphate esters covered here. Commercial TCPP is an isomeric mixture. It is assessed by the EPA within the chlorinated phosphate ester cluster and is the subject of an EU harmonised-classification proposal for reproductive toxicity; confirm its current status for your market and end use.
Is TCPP the same as TCEP?
No. They are different substances with different CAS numbers — TCPP (TCIPP) is 13674-84-5 and TCEP is 115-96-8 — and different regulatory positions. Both are chlorinated phosphate esters in the same family, which is why regulators often assess them as a group, but TCEP has a finalized EPA TSCA unreasonable-risk determination and is a REACH substance of very high concern, while TCPP is at an earlier assessment stage. Map your formulation to the exact CAS rather than treating the family as one item.
What is chlorinated tris?
“Chlorinated tris” is the common name for TDCPP, also written TDCIPP, tris(1,3-dichloro-2-propyl) phosphate, CAS 13674-87-8. It is a chlorinated phosphate ester flame retardant historically used in flexible polyurethane foam, including in furniture and some childcare articles. California lists it under Proposition 65 as a carcinogen, effective October 28, 2011, and restricts it above 0.1% in certain new consumer products; the EPA assesses it within the chlorinated phosphate ester cluster.
What can replace chlorinated tris and the other chlorinated phosphate esters?
Depending on the polymer and the fire test, the common substitutions are non-chlorinated phosphorus esters such as TEP, TPP, TCP, CDP, DPOP, and IPPP, ammonium polyphosphate for intumescent systems, or mineral hydroxide and nitrogen-based systems. Important caveat: a non-chlorinated or halogen-free label is a chemistry descriptor, not a statement that the replacement is lower-hazard. Several non-chlorinated phosphorus esters carry their own classifications and review status, and substitutions usually need higher loading or a synergist package, so qualify any replacement for your specific application.
Does “non-chlorinated” mean a flame retardant is safe?
No. “Non-chlorinated” and “halogen-free” mean only that the substance contains no chlorine or bromine. They are not statements that an additive is safe, non-toxic, or environmentally preferable, and several non-chlorinated phosphorus flame retardants carry their own hazard classifications and regulatory review. Review the current Safety Data Sheet and confirm the regulatory status of any flame retardant, chlorinated or not, before specifying it.
Editorial note. This article is general technical and regulatory-status information for plastics, coatings, foam, and textile formulation and procurement professionals. It is not legal, regulatory, or compliance advice. Regulatory status for flame retardants, and particularly for chlorinated phosphate esters such as TCEP, TCPP/TCIPP, and TDCPP/TDCIPP, varies by substance, jurisdiction, end use, and date and is actively changing; the statements here reflect publicly available US EPA, California OEHHA (Proposition 65), EU REACH/ECHA, and US NTP information at the time of writing and must be re-confirmed against the primary sources for your jurisdiction, substance, and application before you rely on them. Nothing here is a medical, health, safety, environmental, or efficacy claim, and no flame retardant referenced — chlorinated or non-chlorinated — is characterized as “safe,” “non-toxic,” “safer,” “green,” or “eco-friendly”; “non-chlorinated” and “halogen-free” are used only as factual chemistry descriptors. Flame-retardant performance depends on the specific polymer, grade, loading, and the governing fire-test standard and must be validated on your own system; the Certificate of Analysis governs the grade you buy, and the applicable fire code governs your end use. Always consult the current Safety Data Sheet before handling. Products are sold for industrial and professional use only. RawSource makes no warranty, express or implied, and assumes no liability for use of this information.
