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1,4-Butanediol, polymer with 1,1'-methylenebis[4-isocyanatobenzene]

CAS 25805-16-7

EPA and Census publish no US supply data for this chemical.

Molecular structure of 25805-16-7
US productionNot reported
Top sourceNo public record

EPA exempts this chemical from its production survey.

Why supply is unknown

Where It Comes From

Customs basis: HS 390950 · narrow

EPA and Census publish no US supply data for this chemical.

HS customs code 390950 covers 5 tracked chemicals in total. US Census does not break out this chemical's share, so the country-of-origin mix is not available. EPA CDR reports import dependency at the chemical level separately, shown above.

Why It Matters

No EPA sector or FDA product records name a use for this chemical.

Chemical Identity

CAS25805-16-7
PubChem CIDNot recorded
DTXSIDDTXSID70948708
FormulaC19H20N2O4
Mol. Weight340.379 g/mol
SMILESOCCCCO.O=C=NC1=CC=C(CC2=CC=C(C=C2)N=C=O)C=C1

Data Sources

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Brief citations

1,4-Butanediol, polymer with 1,1'-methylenebis[4-isocyanatobenzene] (CAS 25805-16-7) https://chemicalindependence.com/chemical/25805-16-7/ EPA TSCA Inventory: CAS 25805-16-7. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory