Methyl-tripropoxysilane
Methyl-tripropoxysilane (CAS: 5581-66-8, Formula: CH3Si(OCH2CH2CH3)3) is an organosilicon compound with a molecular weight of 220.38 g/mol. This trialkoxysilane is primarily utilised as a precursor in materials science, particularly for the synthesis of silsesquioxanes and POSS nanohybrids. Its chemical structure makes it valuable for surface modification and in the development of advanced nanomaterials.

Precursor for Silsesquioxanes and POSS Nanohybrids
Methyl-tripropoxysilane serves as a key building block in the synthesis of polyhedral oligomeric silsesquioxanes (POSS) and related nanohybrid materials. These materials find applications in advanced composites and coatings due to their unique properties.
Surface Modification Agent
The compound can be employed for modifying the surfaces of various substrates, imparting new characteristics such as hydrophobicity or improved adhesion. This is achieved through its ability to form covalent bonds with hydroxyl-containing surfaces.
Chemical Synthesis Intermediate
As an organosilicon reagent, it is useful in diverse chemical synthesis pathways, contributing methyl and propoxy groups to target molecules. Its reactivity allows for controlled incorporation into complex structures.
Nanomaterial Development
This silane is instrumental in the development of novel nanomaterials, including functionalised nanoparticles and thin films. Its use enables precise control over material architecture at the nanoscale.
| Molecular weight | 220.38 |
|---|---|
| Linear formula | CH3Si(OCH2CH2CH3)3 |
| Assay | 97% |
| Boiling point | 83 °C/13 mmHg(lit.) |
| Density | 0.878 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.401(lit.) |


Hazard statements
- H226Flammable liquid and vapour
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | Eyeshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 60 °C / 140 °F |
| Transport (UN / ADR) | UN 1993C 3 / PGIII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36/37/38 |
| Safety statements (S) | 26-36 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Methyl-tripropoxysilane used for?
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Methyl-tripropoxysilane (CAS: 5581-66-8) is used as a precursor for synthesizing silsesquioxanes, POSS nanohybrids, and for surface modification in materials science. It is also employed as an intermediate in chemical synthesis and nanomaterial development.
What are the CAS number and formula for Methyl-tripropoxysilane?
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The CAS number for Methyl-tripropoxysilane is 5581-66-8, and its chemical formula is CH3Si(OCH2CH2CH3)3.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Methyl-tripropoxysilane with an assay of 97%. This is a technical/research grade material, and TSS does not represent it as USP, BP, EP, or any other pharmacopoeial standard unless explicitly stated.
What are the safety considerations for handling Methyl-tripropoxysilane?
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Methyl-tripropoxysilane is a flammable liquid and vapour (H226) and can cause skin irritation (H315), serious eye irritation (H319), and respiratory irritation (H335). Always use appropriate personal protective equipment, including eyeshields, gloves, and a suitable respirator, and handle in a well-ventilated area.
How is Methyl-tripropoxysilane packed, shipped, and exported?
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Methyl-tripropoxysilane is packed according to safety regulations for flammable liquids and hazardous materials. Shipments are handled by qualified carriers, and Tech Serve Solutions has extensive experience in exporting chemicals globally.
How can I request a quote or sample for Methyl-tripropoxysilane?
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To request a quote or a sample of Methyl-tripropoxysilane, please contact our sales team via the website or by phone, providing your details and the quantity required.
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