Baby Safety / Compounds / Propylene oxide

Is Propylene oxide safe for babies and kids?

High risk for kids

Infants may be exposed to Propylene oxide through residual monomer migration from food-contact plastics, bottles, and packaging. Immature hepatic conjugation and renal clearance prolong internal exposure.

What is propylene oxide?

The IUPAC name is 2-methyloxirane.

Also known as: 2-methyloxirane, 1,2-Epoxypropane, Methyloxirane, Propene oxide.

IUPAC name
2-methyloxirane
CAS number
75-56-9
Molecular formula
C3H6O
Molecular weight
58.08 g/mol
SMILES
CC1CO1
PubChem CID
6378

Risk for babies

High risk

Infants may be exposed to Propylene oxide through residual monomer migration from food-contact plastics, bottles, and packaging. Immature hepatic conjugation and renal clearance prolong internal exposure.

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

Context-dependent

Prenatal exposure to residual Propylene oxide from food-contact materials is a concern due to potential developmental toxicity. Monomers may leach from plastics at elevated temperatures.

No specific reproductive toxicity data identified, but pregnancy-specific safety data is limited for most chemicals. Precautionary minimization of exposure is recommended.

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

Regulatory consensus

21 regulatory and scientific bodies have classified Propylene oxide. The classifications differ — that's the data.

AgencyYearClassificationNotes
IARC1994Group 2B
US EPA2001likely human carcinogen
EPA CTX / NIOSH—potential occupational carcinogen
EPA CTX / IRIS—B2 (Probable human carcinogen - based on sufficient evidence of carcinogenicity in animals)
EPA CTX / NTP RoC—Reasonably Anticipated to be a Human Carcinogen
EPA CTX / IARC—Group 2B - Possibly carcinogenic to humans
EPA CTX / EPA OPP—Group B2 Probable Human Carcinogen
EPA CTX / CalEPA—Known human carcinogen
EPA CTX / Genetox—Genotoxicity: positive (Ames: positive, 19 positive / 5 negative reports)
EPA CTX / Genetox—Genotoxicity: positive (Ames: positive, 19 positive / 5 negative reports)
EPA CTX / Skin-Eye—Eye Irritation: Eye Irrit. 2 (score: high)
EPA CTX / Skin-Eye—Skin Sensitization: Sh (score: high)
EPA CTX / Skin-Eye—Eye Irritation: Category 1 (score: very high)
EPA CTX / Skin-Eye—Skin Irritation: Category 2 (score: high)
EPA CTX / Skin-Eye—Skin Sensitization: Category 1 (score: high)
EPA CTX / Skin-Eye—Eye Irritation: Eye Irrit. 2 (score: high)
EPA CTX / Skin-Eye—Skin Irritation: Skin Irrit. 2 (score: high)
EPA CTX / Skin-Eye—Eye Irritation: Category 6.4A (Category 2A) (score: high)
EPA CTX / Skin-Eye—Skin Irritation: Category 6.3A (Category 2) (score: high)
EPA CTX / Skin-Eye—skin sensitisation: in vivo (non-LLNA): Not likely to be sensitizing (score: low)
EPA CTX / Skin-Eye—skin irritation: in vivo: Studies Indicate No Significant Irritation (score: low)

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 propylene oxide

  • 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 Propylene oxide:

  • 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 propylene oxide safe for kids?

Infants may be exposed to Propylene oxide through residual monomer migration from food-contact plastics, bottles, and packaging. Immature hepatic conjugation and renal clearance prolong internal exposure.

What products contain propylene oxide?

Propylene oxide 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 propylene oxide?

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 propylene oxide?

Propylene oxide has been classified by 21 agencies including IARC, US EPA, EPA CTX / NIOSH, EPA CTX / IRIS, EPA CTX / NTP RoC, 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 Propylene oxide in the baby app

Look up products containing propylene oxide, compare to alternatives, and explore the full data record.

Open in baby View raw API data

Sources (3)
  1. IARC Monographs Volume 60: Propylene Oxide — Group 2B; Nasal Cavity Carcinomas in Rats and Mice; Inadequate Human Evidence; Direct-Acting Epoxide Alkylation (1994) — iarc_monograph
  2. US EPA IRIS: Propylene Oxide — Likely Human Carcinogen via Inhalation; Nasal Cavity Tumor Dose-Response; Inhalation Unit Risk Estimate; Occupational and Food Fumigation Exposure (2001) — regulatory
  3. NTP 14th Report on Carcinogens: Propylene Oxide — Reasonably Anticipated to Be a Human Carcinogen; Rodent Inhalation Data; Polyurethane Foam and Food Fumigation Industry Exposure (2016) — 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 →