Baby Safety / Compounds / Triethyl phosphate (TEP)

Is Triethyl phosphate (TEP) safe for babies and kids?

Elevated risk for kids

Infants are more vulnerable to Triethyl phosphate (TEP) than children or adults due to immature hepatic/renal clearance, higher intake-to-body-weight ratio, rapid organ development, and increased gastrointestinal absorption.

What is triethyl phosphate (tep)?

The IUPAC name is triethyl phosphate.

Also known as: triethyl phosphate, Triethylphosphate, Tris(ethyl) phosphate, Triethoxyphosphine oxide.

IUPAC name
triethyl phosphate
CAS number
78-40-0
Molecular formula
C6H15O4P
Molecular weight
182.15 g/mol
SMILES
CCOP(=O)(OCC)OCC
PubChem CID
6535

Risk for babies

Elevated risk

Infants are more vulnerable to Triethyl phosphate (TEP) than children or adults due to immature hepatic/renal clearance, higher intake-to-body-weight ratio, rapid organ development, and increased gastrointestinal absorption.

Neonates and infants up to 12 months have incomplete blood-brain barrier development, immature Phase I/II metabolic enzymes (particularly CYP3A4, UGT1A1), and higher gastrointestinal permeability. Equivalent doses produce higher internal concentrations and longer residence times.

What to do: Minimize infant exposure through source control. For breastfeeding mothers: reduce maternal exposure. For formula-fed infants: use certified low-migration bottles and verified water sources. Consult pediatrician regarding any concerns.

Risk for pregnant and nursing people

Elevated risk

Pregnancy alters the metabolism and distribution of Triethyl phosphate (TEP), potentially increasing fetal exposure. The developing embryo/fetus is vulnerable during organogenesis (weeks 3-8) and neurological development. Placental transfer should be assumed.

Suspected reproductive toxicant (GHS H361) or suspected endocrine disruptor. Precautionary approach warranted. Animal studies or limited human data suggest developmental toxicity potential.

What to do: Minimize exposure during pregnancy and lactation. Consult healthcare provider regarding specific risks. Consider alternative products with lower hazard profiles.

Regulatory consensus

3 regulatory and scientific bodies have classified Triethyl phosphate (TEP). The classifications differ — that's the data.

AgencyYearClassificationNotes
IARC2021Not evaluated by IARC — triethyl phosphate (TEP) is an organophosphate ester (OPE) flame retardant and plasticizer; no carcinogenicity classification by IARC, NTP, or EPA; primary regulatory concerns are reproductive/developmental toxicity (EU Repr. 2 proposed) and widespread presence in indoor environments as an emerging contaminant
EPA CTX / Genetox—Genotoxicity: negative (Ames: negative, 0 positive / 2 negative reports)
EPA CTX / Genetox—Genotoxicity: negative (Ames: negative, 0 positive / 2 negative reports)

Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.

Where kids encounter triethyl phosphate (tep)

  • Industrial Facilities — Manufacturing plants, Chemical storage areas, Waste treatment sites
  • Occupational Environments — Factories, Warehouses, Transportation vehicles

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Triethyl phosphate (TEP):

  • Inherently flame-resistant materials (wool, modacrylic, Nomex)
    Trade-offs: Higher material cost. Limited color/texture options.
    Relative cost: 1.2-2×
  • Barrier fabric technology
    Trade-offs: Adds manufacturing step and cost
    Relative cost: 1.2-2×

Frequently asked questions

Is triethyl phosphate (tep) safe for kids?

Infants are more vulnerable to Triethyl phosphate (TEP) than children or adults due to immature hepatic/renal clearance, higher intake-to-body-weight ratio, rapid organ development, and increased gastrointestinal absorption.

What products contain triethyl phosphate (tep)?

Triethyl phosphate (TEP) appears in: Manufacturing plants (Industrial facilities); Chemical storage areas (Industrial facilities); Factories (Occupational environments); Warehouses (Occupational environments).

What should I do if my child is exposed to triethyl phosphate (tep)?

Minimize infant exposure through source control. For breastfeeding mothers: reduce maternal exposure. For formula-fed infants: use certified low-migration bottles and verified water sources. Consult pediatrician regarding any concerns.

Why do regulators disagree about triethyl phosphate (tep)?

Triethyl phosphate (TEP) has been classified by 3 agencies including IARC, EPA CTX / Genetox, EPA CTX / Genetox, with differing conclusions. Regulators apply different standards of evidence (animal data weighting, exposure-pattern assumptions, epidemiological power thresholds), which is why two scientific bodies can review the same data and reach different conclusions. See the regulatory consensus table on this page for the full picture.

See Triethyl phosphate (TEP) in the baby app

Look up products containing triethyl phosphate (tep), compare to alternatives, and explore the full data record.

Open in baby View raw API data

Sources (1)
  1. Triethyl Phosphate TEP Organophosphate Ester OPE Flame Retardant Indoor Environment; EU CLP Repr 2 H361d Suspected Reproductive Toxicant; PBDE Replacement RoHS; House Dust Biomonitoring DEP Metabolite; Cholinesterase Inhibition Low Potency; Aquatic Chronic 2 H411; WWTP Incomplete Removal Emerging Contaminant; ECHA REACH CoRAP (2021) — regulatory

Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for veterinary, medical, legal, or regulatory advice. Why we built ALETHEIA →