Is HMDI (bis(4-isocyanatocyclohexyl)methane) safe for babies and kids?
Moderate risk for kidsInfants are more vulnerable to HMDI (bis(4-isocyanatocyclohexyl)methane) 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 hmdi (bis(4-isocyanatocyclohexyl)methane)?
The IUPAC name is 1-isocyanato-4-[(4-isocyanatocyclohexyl)methyl]cyclohexane.
Also known as: 1-isocyanato-4-[(4-isocyanatocyclohexyl)methyl]cyclohexane, Bis(4-isocyanatocyclohexyl)methane, Nacconate H 12, Methylene bis(4-cyclohexylisocyanate).
- IUPAC name
- 1-isocyanato-4-[(4-isocyanatocyclohexyl)methyl]cyclohexane
- CAS number
- 5124-30-1
- Molecular formula
- C15H22N2O2
- Molecular weight
- 262.35 g/mol
- SMILES
- C1CC(CCC1CC2CCC(CC2)N=C=O)N=C=O
- PubChem CID
- 21202
Risk for babies
Moderate riskInfants are more vulnerable to HMDI (bis(4-isocyanatocyclohexyl)methane) 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.
Risk for pregnant and nursing people
Context-dependentPregnancy alters the metabolism and distribution of HMDI (bis(4-isocyanatocyclohexyl)methane), 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.
Regulatory consensus
3 regulatory and scientific bodies have classified HMDI (bis(4-isocyanatocyclohexyl)methane). The classifications differ — that's the data.
| Agency | Year | Classification | Notes |
|---|---|---|---|
| US OSHA / ACGIH / EU REACH (HMDI — H12MDI — Desmodur W — methylene dicyclohexyl diisocyanate — CAS 5124-30-1 — aliphatic diisocyanate — ACGIH TLV-C: 0.005 ppm (ceiling) for isocyanate class — reflecting respiratory sensitization hazard; OSHA PEL: none specific for HMDI (TDI PEL 0.02 ppm); EU REACH: registered; EU CLP: Acute Tox. 4 (inhalation), Skin Irrit. 2, Eye Irrit. 2, Resp. Sens. 1, Skin Sens. 1 — H334 (May cause allergy or asthma symptoms or breathing difficulties if inhaled); H317 (May cause allergic skin reaction); SVHC candidate list: not listed (isocyanate respiratory sensitizers are hazardous but not SVHCs in EU REACH under current criteria); no IARC carcinogenicity classification; no NTP carcinogenicity listing; no US EPA carcinogenicity classification; NIOSH recommended limit: <0.005 ppm (ceiling) for all isocyanates; MDI (aromatic — hq-c-org-000074) differs from HMDI (aliphatic) in volatility but both are potent respiratory sensitizers; aliphatic diisocyanates used in light-stable non-yellowing polyurethane coatings; isocyanates collectively cause approximately 5–10% of all occupational asthma cases) | 2020 | no IARC, NTP, or EPA carcinogenicity classification; ACGIH TLV-C 0.005 ppm (isocyanate ceiling); EU CLP Resp. Sens. 1 (H334); Skin Sens. 1 (H317); potent respiratory and dermal sensitizer; no SVHC listing; major cause of occupational asthma | |
| EPA CTX / Genetox | — | Genotoxicity: negative (Ames: negative, 0 positive / 3 negative reports) | |
| EPA CTX / Genetox | — | Genotoxicity: negative (Ames: negative, 0 positive / 3 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 hmdi (bis(4-isocyanatocyclohexyl)methane)
- 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 HMDI (bis(4-isocyanatocyclohexyl)methane):
-
Bio-based polymer alternatives where available
Trade-offs: Performance limitations. End-of-life complexity.Relative cost: 2-5× conventional
Frequently asked questions
Is hmdi (bis(4-isocyanatocyclohexyl)methane) safe for kids?
Infants are more vulnerable to HMDI (bis(4-isocyanatocyclohexyl)methane) 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 hmdi (bis(4-isocyanatocyclohexyl)methane)?
HMDI (bis(4-isocyanatocyclohexyl)methane) 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 hmdi (bis(4-isocyanatocyclohexyl)methane)?
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 hmdi (bis(4-isocyanatocyclohexyl)methane)?
HMDI (bis(4-isocyanatocyclohexyl)methane) has been classified by 3 agencies including US OSHA / ACGIH / EU REACH (HMDI — H12MDI — Desmodur W — methylene dicyclohexyl diisocyanate — CAS 5124-30-1 — aliphatic diisocyanate — ACGIH TLV-C: 0.005 ppm (ceiling) for isocyanate class — reflecting respiratory sensitization hazard; OSHA PEL: none specific for HMDI (TDI PEL 0.02 ppm); EU REACH: registered; EU CLP: Acute Tox. 4 (inhalation), Skin Irrit. 2, Eye Irrit. 2, Resp. Sens. 1, Skin Sens. 1 — H334 (May cause allergy or asthma symptoms or breathing difficulties if inhaled); H317 (May cause allergic skin reaction); SVHC candidate list: not listed (isocyanate respiratory sensitizers are hazardous but not SVHCs in EU REACH under current criteria); no IARC carcinogenicity classification; no NTP carcinogenicity listing; no US EPA carcinogenicity classification; NIOSH recommended limit: <0.005 ppm (ceiling) for all isocyanates; MDI (aromatic — hq-c-org-000074) differs from HMDI (aliphatic) in volatility but both are potent respiratory sensitizers; aliphatic diisocyanates used in light-stable non-yellowing polyurethane coatings; isocyanates collectively cause approximately 5–10% of all occupational asthma cases), 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.
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- ACGIH TLV-C 0.005 ppm Isocyanates; EU CLP Resp. Sens. 1 H334 Skin Sens. 1 H317; NIOSH Isocyanate Recommended Limit; Occupational Asthma 5-10% All Occupational Asthma; H12MDI Aliphatic UV-Stable Non-Yellowing Polyurethane; No IARC NTP EPA Carcinogenicity Classification (2020) — 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 →