Baby Safety / Compounds / Irgafos 168

Is Irgafos 168 safe for babies and kids?

High risk for kids

Infants are more vulnerable to Irgafos 168 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 irgafos 168?

The IUPAC name is tris(2,4-di-tert-butylphenyl) phosphite.

Also known as: tris(2,4-di-tert-butylphenyl) phosphite, Tris(2,4-di-tert-butylphenyl)phosphite, Phosphite antioxidant, 4-MORPHOLIN-4-YL-PIPERIDINE-1-CARBOXYLIC ACID [1-(3-BENZENESULFONYL-1-PROPYL-ALLYLCARBAMOYL)-2-PHENYLETHYL]-AMIDE.

IUPAC name
tris(2,4-di-tert-butylphenyl) phosphite
CAS number
31570-04-4
Molecular formula
C42H63O3P
Molecular weight
646.93 g/mol
SMILES
CCCC(C=CS(=O)(=O)C1=CC=CC=C1)NC(=O)C(CC2=CC=CC=C2)NC(=O)N3CCC(CC3)N4CCOCC4
PubChem CID
6323426

Risk for babies

High risk

Infants are more vulnerable to Irgafos 168 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 Irgafos 168, 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

2 regulatory and scientific bodies have classified Irgafos 168. The classifications differ — that's the data.

AgencyYearClassificationNotes
REACH——No SVHC; no restrictions
FDA——Permitted in food contact applications; CFR Part 178 compliant

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 irgafos 168

  • polyolefins
  • polyesters
  • food_packaging
  • polyvinyl_chloride
  • polymer_blends

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Irgafos 168:

  • Bio-based plasticizers (epoxidized soybean oil, citrate esters)
    Trade-offs: Alternative approach; specific tradeoffs depend on application context, scale, and regulatory requirements. Full hazard assessment of alternative recommended before adoption to avoid regrettable substitution.
    Relative cost: 2-5× conventional
  • Non-phthalate plasticizers (DINCH, DEHT) where phthalates are currently used
    Trade-offs: Alternative approach; specific tradeoffs depend on application context, scale, and regulatory requirements. Full hazard assessment of alternative recommended before adoption to avoid regrettable substitution.
    Relative cost: 1.2-2×
  • Additive-free polymer formulations where performance allows
    Trade-offs: Alternative approach; specific tradeoffs depend on application context, scale, and regulatory requirements. Full hazard assessment of alternative recommended before adoption to avoid regrettable substitution.
    Relative cost: Lower (ingredient elimination)

Frequently asked questions

Is irgafos 168 safe for kids?

Infants are more vulnerable to Irgafos 168 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 irgafos 168?

Irgafos 168 appears in: polyolefins; polyesters; food packaging.

What should I do if my child is exposed to irgafos 168?

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 Irgafos 168 in the baby app

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Sources (2)
  1. PubChem Compound CID 6323426 — database
  2. ATSDR Toxicological Profile — CAS 31570-04-4 — 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 →