- ▸ Composite coupling: Couples mineral and glass fillers to organic resin matrices.
- ▸ Adhesion promotion: Improves bond strength between inorganic substrates and polymers.
- ▸ Silane intermediate: Reactive chloropropyl handle for downstream organosilane synthesis.
- ▸ Surface treatment: Modifies fillers and textile goods for resin compatibility.
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
Request SDS →(3-Chloropropyl)trimethoxysilane (CPTMS, CAS 2530-87-2) is an organofunctional silane whose trimethoxysilyl group bonds to mineral and glass surfaces while the chloropropyl group anchors to organic polymers. It is used as a coupling agent in filled composites and treated textile goods, as an adhesion promoter, and as an intermediate for synthesizing other organosilicon compounds.
Regulatory & registration requirements
- TSCA (US):
- REACH (EU):
- EC number: 219-787-9
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Frequently Asked Questions
What is (3-chloropropyl)trimethoxysilane used for?
CPTMS is an organofunctional silane coupling agent. Its trimethoxysilyl group hydrolyzes to bond mineral and glass surfaces while the chloropropyl group anchors to organic polymers, so it functions as an adhesion promoter in filled composites and treated textile goods. It is also widely used as a reactive intermediate for synthesizing other organosilicon compounds via the chloropropyl handle.
What is the CAS number and molecular formula of CPTMS?
(3-Chloropropyl)trimethoxysilane has CAS number 2530-87-2 and molecular formula C6H15ClO3Si. It is classified under the Silanes & Organosilanes family.
How does CPTMS work as a coupling agent?
The three methoxy groups hydrolyze to silanols that condense onto hydroxylated inorganic surfaces such as silica, glass, and minerals. The terminal chloropropyl group remains available to react with or anchor to organic polymer matrices, bridging the inorganic filler and the resin to improve bond strength and reinforcement.
What is the HS code for CPTMS for import/export?
It classifies under HS 2931.90 — other organo-inorganic compounds (organo-silicon compounds). Confirm the destination-country tariff suffix with your customs broker; RawSource provides commercial documentation on bulk orders.
What bulk packaging and documentation does RawSource supply for CPTMS?
RawSource distributes CPTMS in industrial volumes (drums, totes, and IBCs) to manufacturers, with Certificate of Analysis and Safety Data Sheet provided per lot. Request a bulk quote with your target volume and packaging for current pricing and lead time.
What is the REACH and TSCA regulatory status of (3-Chloropropyl)trimethoxysilane (CPTMS)?
(3-Chloropropyl)trimethoxysilane (CPTMS) (CAS 2530-87-2) is subject to U.S. TSCA Inventory requirements; supplying it into the EU requires valid REACH registration ((EC) No 1907/2006). RawSource cannot verify a third-party supplier's registrations — buyers should require documented TSCA and REACH compliance for their jurisdiction and volume (EC 219-787-9).