Cesium hydroxide (Cs(OH))

CAS 21351-79-1

U.S. production volumes are classified as confidential business information.

US productionCBI

Confidential Business Information. The EPA withholds this volume because publishing it could reveal the reporting company's trade secrets.

Import value, 2024$123M

Top sourceBrazil 32%

At least one company claimed its 2023 production or import volume for this chemical as confidential, so EPA withholds it.

Why supply is unknown

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

Where It Comes From

Customs basis: HS 282590 · basket

EPA reports by year

2023: US production Confidential · Imports Confidential

These shares come from HS customs code 282590, which covers 34 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).

BR 32%BrazilTR 15%TurkeyCN 9%ChinaVN 8%VietnamKR 8%South Korea

Ireland
Mexico
Spain
Belgium
Switzerland
Trinidad and Tobago
Hong Kong

Domestic parents -- activity not disclosed (1)

EPA records name a US company for this chemical but do not disclose whether the company made it here or imported it.

Albemarle

Why It Matters

Sectors

Core Chemicals

Downstream UsesNot recorded

FDA Shortage Status

Whether any manufacturer currently reports this drug as in shortage on the FDA Drug Shortages database. "Active Shortage" means at least one presentation has status "current."

No FDA shortage records

Industrial Uses

•Intermediate in All Other Basic Inorganic Chemical Manufacturing (100%)Processing as a reactant

Chemical Identity

CAS21351-79-1

PubChem CIDNot recorded

DTXSIDDTXSID7066699

FormulaCsHO

Mol. Weight149.912 g/mol

SMILESO[Cs]

Data Sources

EPA TSCA InventoryRetrieved 2026-04-29
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

Cesium hydroxide (Cs(OH)) (CAS 21351-79-1) https://chemicalindependence.com/chemical/21351-79-1/ EPA TSCA Inventory: CAS 21351-79-1. Retrieved 2026-04-29. https://www.epa.gov/tsca-inventory EPA Chemical Data Reporting: 21351-79-1. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 21351-79-1. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 282590 for CAS 21351-79-1. Reporting year: 2024. https://usatrade.census.gov/