(3-Chloropropyl)(dimethoxy)methylsilane

CAS 18171-19-2

Companies reported imports and no US production of this chemical to EPA for 2019.

US productionZero

Import value, 2024$537M

Import volume66.0K lb

Import dependency100%

Top sourceChina 39%

Production is reported production, not a complete census of factories. Production reporting year: 2019. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

(3-Chloropropyl)(dimethoxy)methylsilane · US import value by year

Peak 2013: $1.1B · 2024: $537M · 2025: $470M

Where It Comes From

Customs basis: HS 293190 · basket

EPA reports by year

2019: US production Zero · Imports 66.0K lb

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 importers (1)

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

Shin Etsu Silicones Of America

Why It Matters

Sectors

Plastics & Rubber

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 Synthetic Rubber Manufacturing (100%)Processing as a reactant

Vendor Pricing

$0.32/gCombi-Blocks, Inc.

CountryUnited States

Pack$320.00 / 1 kg

Purity95%

Vendors10 available

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

9 more vendors

Vendor	Country	$/g	Pack	Purity
Aaron Chemicals LLC	Hong Kong	$0.38	500 g	95%
Fluorochem UK	United Kingdom	$0.39	500 g	95%
Angene Chemical	China → Hong Kong	$0.41	500 g	95%
A2B Chem LLC	United States	$0.79	1 kg	95%
AA BLOCKS	United States	$0.83	1 kg	95%
AK Scientific, Inc.	United States	$2.68	25 g	98%
Ambeed, Inc.	United States	$4.00	5 g	95%
Angene International Limited	United States	$5.56	25 g	98%
Angene	China → Hong Kong	$4266.67	30 mg	95%

Chemical Identity

CAS18171-19-2

PubChem CID87491

DTXSIDDTXSID60939463

FormulaC6H15ClO2Si

Mol. Weight182.72 g/mol

SMILESCO[Si](C)(CCCCl)OC

Data Sources

EPA CompTox (DSSTox) · DTXSID60939463Retrieved 2026-04-06
PubChem · compound 87491Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2019 · Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2019 · Retrieved 2026-10-04
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

(3-Chloropropyl)(dimethoxy)methylsilane (CAS 18171-19-2) https://chemicalindependence.com/chemical/18171-19-2/ EPA CompTox (DSSTox): DTXSID60939463. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID60939463 PubChem: 87491. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/87491 EPA Chemical Data Reporting: 18171-19-2. Reporting year: 2019. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 18171-19-2. Reporting year: 2019. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 293190 for CAS 18171-19-2. Reporting year: 2024. https://usatrade.census.gov/