METHYLTRIMETHOXYSILANE- ▸ Coupling agent: Couples thermoplastic and thermosetting resins to mineral fillers.
- ▸ Silicone crosslinker: Crosslinks silicone sealant systems.
- ▸ Water repellency: Acts as a water-repellent treatment component for surfaces and substrates.
- ▸ Hard-coats: Used in silicone hard-coat coatings for plastics.
- ▸ Surface modifier and intermediate: Functionalizes surfaces and serves as a silane intermediate.
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.
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Transport classification per the UN Model Regulations / 49 CFR 172.101 Hazardous Materials Table. Confirm against the grade-specific SDS (Section 14) before shipping.
Methyltrimethoxysilane (MTMS, CAS 1185-55-3) is a trifunctional methoxysilane that hydrolyzes and condenses into methylsiloxane networks. It is used as a coupling agent in thermoplastic and thermosetting resins, a crosslinker in silicone sealants, a water-repellent component, and in silicone hard-coats for plastics. It also serves as a surface modifier and intermediate.
Frequently Asked Questions
What is methyltrimethoxysilane?
Methyltrimethoxysilane (MTMS, CAS 1185-55-3, C4H12O3Si) is a trifunctional methoxysilane that hydrolyzes and condenses into methylsiloxane networks. It is supplied as a coupling agent, silicone crosslinker, water-repellent component, and silane intermediate.
What is the use of methyltrimethoxysilane?
It functions as a coupling agent linking thermoplastic and thermosetting resins to mineral fillers, as a crosslinker in silicone sealant systems, as a water-repellent treatment component for surfaces and substrates, and in silicone hard-coat coatings for plastics. It also serves as a surface modifier and intermediate.
What is methyltrichlorosilane used for, and how does it differ from MTMS?
Methyltrichlorosilane is a chlorosilane that releases hydrogen chloride on hydrolysis, whereas MTMS releases methanol, making MTMS easier to handle in coupling and crosslinking applications. Both build methylsiloxane networks, but MTMS is the methoxy-functional, non-chlorine-evolving route favored in coatings and sealant formulation.
What is the cost of bulk methyltrimethoxysilane?
Bulk MTMS pricing depends on grade, volume, and packaging (drums vs. totes/IBCs) and market silicon-intermediate costs, so RawSource quotes against your specification rather than a fixed catalog price. Submit a bulk RFQ with target volume and packaging to receive current pricing, MOQ, and lead time.
What is the HS code and CAS number for methyltrimethoxysilane?
MTMS is CAS 1185-55-3 and classified under HS heading 2931.90 (other organo-inorganic compounds). RawSource provides a CoA and SDS with each shipment; confirm the country-specific tariff subheading with your broker.