Baby Safety / Compounds / Octamethylcyclotetrasiloxane (D4, cyclic siloxane)

Is Octamethylcyclotetrasiloxane (D4, cyclic siloxane) safe for babies and kids?

Very high risk for kids

Infants are more vulnerable to Octamethylcyclotetrasiloxane (D4, cyclic siloxane) 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 octamethylcyclotetrasiloxane (d4, cyclic siloxane)?

The IUPAC name is 2,2,4,4,6,6-hexamethyl-1,3,5,2,4,6-trioxatrisilinane.

Also known as: 2,2,4,4,6,6-hexamethyl-1,3,5,2,4,6-trioxatrisilinane, HEXAMETHYLCYCLOTRISILOXANE, Cyclotrisiloxane, hexamethyl-, Dimethylsiloxane cyclic trimer.

IUPAC name
2,2,4,4,6,6-hexamethyl-1,3,5,2,4,6-trioxatrisilinane
CAS number
541-05-9
Molecular formula
C6H18O3Si3
Molecular weight
222.46 g/mol
SMILES
C[Si]1(C)O[Si](C)(C)O[Si](C)(C)O1
PubChem CID
10914

Risk for babies

Very high risk

Infants are more vulnerable to Octamethylcyclotetrasiloxane (D4, cyclic siloxane) 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

Context-dependent

Pregnancy alters the metabolism and distribution of Octamethylcyclotetrasiloxane (D4, cyclic siloxane), potentially increasing fetal exposure. The developing embryo/fetus is vulnerable during organogenesis (weeks 3-8) and neurological development. Placental transfer should be assumed.

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

1 regulatory bodyhas classified Octamethylcyclotetrasiloxane (D4, cyclic siloxane).

AgencyYearClassificationNotes
GHS—Danger

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 octamethylcyclotetrasiloxane (d4, cyclic siloxane)

  • Industrial Facilities — Manufacturing plants, Waste treatment sites
  • Occupational Environments — Factories, Warehouses

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Octamethylcyclotetrasiloxane (D4, cyclic siloxane):

  • 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 octamethylcyclotetrasiloxane (d4, cyclic siloxane) safe for kids?

Infants are more vulnerable to Octamethylcyclotetrasiloxane (D4, cyclic siloxane) 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 octamethylcyclotetrasiloxane (d4, cyclic siloxane)?

Octamethylcyclotetrasiloxane (D4, cyclic siloxane) appears in: Manufacturing plants (Industrial facilities); Waste treatment sites (Industrial facilities); Factories (Occupational environments); Warehouses (Occupational environments).

What should I do if my child is exposed to octamethylcyclotetrasiloxane (d4, cyclic siloxane)?

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.

See Octamethylcyclotetrasiloxane (D4, cyclic siloxane) in the baby app

Look up products containing octamethylcyclotetrasiloxane (d4, cyclic siloxane), compare to alternatives, and explore the full data record.

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Sources (3)
  1. PubChem Compound CID 10914 — database
  2. EPA CompTox Chemicals Dashboard — DTXSID6027185 — epa
  3. ATSDR Toxicological Profile — CAS 541-05-9 — reference

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 →