Silane, trimethyl(octadecyloxy)-

CAS 18748-98-6

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$537M

Import volumeZero

Top sourceChina 39%

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 293190 · basket

EPA reports by year

2023: US production Confidential · Imports Zero
2019: US production Confidential · Imports Zero

These shares come from HS customs code 293190, which covers 378 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 39%ChinaDE 17%GermanyIT 9%ItalyIN 7%IndiaJP 7%Japan

Ireland
Netherlands
Switzerland
Monaco
Ukraine
Spain
Mexico
Poland
Indonesia
Armenia
Israel
Sweden
Australia
Czech Republic
Hungary
Brunei
Hong Kong
Brazil
Thailand
Argentina
Finland
Austria
Latvia

EPA-registered manufacturers (1)

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

Dow Chemical

Why It Matters

Sectors

EnergyMetals & Mining

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

Chemical Identity

CAS18748-98-6

PubChem CID87778

DTXSIDDTXSID5066405

FormulaC21H46OSi

Mol. Weight342.7 g/mol

SMILESCCCCCCCCCCCCCCCCCCO[Si](C)(C)C

Data Sources

EPA CompTox (DSSTox) · DTXSID5066405Retrieved 2026-04-06
PubChem · compound 87778Retrieved 2026-04-06
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

Silane, trimethyl(octadecyloxy)- (CAS 18748-98-6) https://chemicalindependence.com/chemical/18748-98-6/ EPA CompTox (DSSTox): DTXSID5066405. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID5066405 PubChem: 87778. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/87778 EPA Chemical Data Reporting: 18748-98-6. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 18748-98-6. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 293190 for CAS 18748-98-6. Reporting year: 2024. https://usatrade.census.gov/