Is MTBE (methyl tert-butyl ether) safe for babies and kids?
Moderate risk for kidsInfants are vulnerable to MTBE (methyl tert-butyl ether) through inhalation of volatile residues in household products. Immature blood-brain barrier and higher respiratory rate per body weight amplify CNS exposure.
What is mtbe (methyl tert-butyl ether)?
The IUPAC name is 2-methoxy-2-methylpropane.
Also known as: 2-methoxy-2-methylpropane, tert-Butyl methyl ether, Methyl tert-butyl ether, MTBE.
- IUPAC name
- 2-methoxy-2-methylpropane
- CAS number
- 1634-04-4
- Molecular formula
- C5H12O
- Molecular weight
- 88.15 g/mol
- SMILES
- CC(C)(C)OC
- PubChem CID
- 15413
Risk for babies
Moderate riskInfants are vulnerable to MTBE (methyl tert-butyl ether) through inhalation of volatile residues in household products. Immature blood-brain barrier and higher respiratory rate per body weight amplify CNS 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.
Risk for pregnant and nursing people
Context-dependentOccupational and household exposure to MTBE (methyl tert-butyl ether) during pregnancy is associated with developmental toxicity. Solvents readily cross the placenta and can cause fetal growth restriction.
No specific reproductive toxicity data identified, but pregnancy-specific safety data is limited for most chemicals. Precautionary minimization of exposure is recommended.
Regulatory consensus
9 regulatory and scientific bodies have classified MTBE (methyl tert-butyl ether). The classifications differ — that's the data.
| Agency | Year | Classification | Notes |
|---|---|---|---|
| EPA CTX / IARC | — | Group 3 - Not classifiable as to its carcinogenicity to humans | |
| EPA CTX / Health Canada | — | Group VI: CEPA (unclassifiable with respect to carcinogenicity to humans) | |
| EPA CTX / Health Canada | — | Group VIA: CEPA (unclassifiable with respect to carcinogenicity to humans) | |
| EPA CTX / Genetox | — | Genotoxicity: positive (Ames: positive, 2 positive / 18 negative reports) | |
| EPA CTX / Genetox | — | Genotoxicity: positive (Ames: positive, 2 positive / 18 negative reports) | |
| EPA CTX / Skin-Eye | — | Skin Irritation: Skin Irrit. 2 (score: high) | |
| EPA CTX / Skin-Eye | — | Eye Irritation: Category 2B (score: moderate) | |
| EPA CTX / Skin-Eye | — | Skin Irritation: Category 2 (score: high) | |
| EPA CTX / Skin-Eye | — | Skin Sensitization: Not classified (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 mtbe (methyl tert-butyl ether)
- 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 MTBE (methyl tert-butyl ether):
-
Water-based formulations where feasible
Trade-offs: Longer drying time. May not achieve same performance in all applications.Relative cost: 0.8-1.5×
-
Bio-based solvents (d-limonene, ethyl lactate)
Trade-offs: Higher cost. Flammability concerns with some bio-solvents.Relative cost: 2-5× conventional
Frequently asked questions
Is mtbe (methyl tert-butyl ether) safe for kids?
Infants are vulnerable to MTBE (methyl tert-butyl ether) through inhalation of volatile residues in household products. Immature blood-brain barrier and higher respiratory rate per body weight amplify CNS exposure.
What products contain mtbe (methyl tert-butyl ether)?
MTBE (methyl tert-butyl ether) 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 mtbe (methyl tert-butyl ether)?
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 mtbe (methyl tert-butyl ether)?
MTBE (methyl tert-butyl ether) has been classified by 9 agencies including EPA CTX / IARC, EPA CTX / Health Canada, EPA CTX / Health Canada, 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 MTBE (methyl tert-butyl ether) in the baby app
Look up products containing mtbe (methyl tert-butyl ether), compare to alternatives, and explore the full data record.
Open in baby View raw API dataSources (2)
- US EPA: Drinking Water Advisory: Consumer Acceptability Advice and Health Effects Analysis on Methyl Tertiary-Butyl Ether (MTBE) — Taste/Odor Threshold 20–40 μg/L, No Federal MCL Established (1997) (1997) — regulatory
- WHO Guidelines for Drinking-water Quality (4th edition, incorporating the 1st and 2nd addenda, 2022) — Disinfection Byproducts: THMs, HAAs, Chlorite, Bromate, Chloral Hydrate; Guideline Values and Health Basis (2022) — 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 →