Silane, chlorodimethyloctadecyl-

CAS 18643-08-8

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

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 Confidential

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 (2)

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

Mitsubishi Chemical Group · JP Japan

Mitsubishi Chemical America

Why It Matters

Sectors

Health

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

Vendor Pricing

$0.34/gManchester Organics

CountryUnited Kingdom

Pack$84.60 / 250 g

Purity95%

Vendors11 available

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

10 more vendors

Vendor	Country	$/g	Pack	Purity
Aaron Chemicals LLC	Hong Kong	$0.50	500 g	96%
Angene Chemical	China → Hong Kong	$0.58	500 g	96%
Fluorochem UK	United Kingdom	$0.87	100 g	95%
A2B Chem LLC (1 week)	United States	$2.17	100 g	98%
Angene International Limited	United States	$2.99	100 g	98%
AA BLOCKS (1 week)	United States	$3.17	100 g	98%
AK Scientific, Inc.	United States	$3.60	25 g	95%
Sigma-Aldrich (Rush Stock)	Germany	$4.35	25 g	95%
Sigma-Aldrich	Germany	$4.35	25 g	95%
Angene	China → Hong Kong	$4266.67	30 mg	96%

Chemical Identity

CAS18643-08-8

PubChem CIDNot recorded

DTXSIDDTXSID3066394

FormulaC20H43ClSi

Mol. Weight347.1 g/mol

SMILESCCCCCCCCCCCCCCCCCC[Si](C)(C)Cl

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

← Back to Dashboard ← Back to Health

Brief citations

Silane, chlorodimethyloctadecyl- (CAS 18643-08-8) https://chemicalindependence.com/chemical/18643-08-8/ EPA TSCA Inventory: CAS 18643-08-8. Retrieved 2026-04-29. https://www.epa.gov/tsca-inventory EPA Chemical Data Reporting: 18643-08-8. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 18643-08-8. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 293190 for CAS 18643-08-8. Reporting year: 2024. https://usatrade.census.gov/