Hexachlorocyclopentadiene

CAS 77-47-4

Companies reported imports and no US production of this chemical to EPA for 2023.

US productionZero

Import value, 2024$14M

Import volume141.1K lb

Import dependency100%

Top sourceChina 49%

Production is reported production, not a complete census of factories. Production reporting year: 2023. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Hexachlorocyclopentadiene · US import value by year

2013: $12M · Peak 2018: $39M · 2024: $14M · 2025: $12M

Where It Comes From

Customs basis: HS 290389 · basket

EPA reports by year

2023: US production Zero · Imports 141.1K lb
2019: US production Zero · Imports 117.9K lb

These shares come from HS customs code 290389, which covers 21 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries

Country of origin for US imports, from Census customs data (2024).

CN 49%ChinaGB 13%United KingdomJP 13%JapanIT 11%ItalyIN 11%India

Germany
Russia

EPA-registered importers (1)

Companies that report making or importing this chemical to the EPA. Registration is US-centric and does not indicate import origin.

Velsicol Chemical

Why It Matters

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

Vendor Pricing

$217.80/gLabotest KG

CountryGermany

Pack$1089.00 / 5000 mg

Purity90%

Vendors1 available

Prices reflect listed pack sizes. Small research packs run far above bulk rates.

Chemical Identity

CAS77-47-4

PubChem CID6478

DTXSIDDTXSID2020688

FormulaC5Cl6

Mol. Weight272.8 g/mol

SMILESC1(=C(C(C(=C1Cl)Cl)(Cl)Cl)Cl)Cl

Data Sources

EPA CompTox (DSSTox) · DTXSID2020688Retrieved 2026-04-06
PubChem · compound 6478Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

← Back to Dashboard

Brief citations

Hexachlorocyclopentadiene (CAS 77-47-4) https://chemicalindependence.com/chemical/77-47-4/ EPA CompTox (DSSTox): DTXSID2020688. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID2020688 PubChem: 6478. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/6478 EPA Chemical Data Reporting: 77-47-4. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 290389 for CAS 77-47-4. Reporting year: 2024. https://usatrade.census.gov/