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Polystyrene

CAS 9003-53-6

Benzene, ethenyl-, homopolymer

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

Molecular structure of 9003-53-6
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 390311, 390319 · narrow

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

HS customs code 390311, 390319 covers 2 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

CAS9003-53-6
PubChem CIDNot recorded
DTXSIDDTXSID5031925
Formula(C8H8)n
Mol. WeightNot recorded
SMILES*-CC(-*)C1=CC=CC=C1 |$star_e;;;star_e;;;;;;$,c:6,8,t:4,Sg:n:4,5,6,7,8,9,2,1::ht|

Data Sources

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Brief citations

Polystyrene (CAS 9003-53-6) https://chemicalindependence.com/chemical/9003-53-6/ EPA TSCA Inventory: CAS 9003-53-6. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory