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Silane USi-6120 – Methyldiethoxysilane (MDES)
Non-Organoreactive Alkyl Alkoxysilane for Specialty Intermediates & Hydrophobic Modification
CAS No.: 2031-62-1
EINECS No.: 217-982-3
Molecular Weight: 134.25 g/mol
Synonyms:
Diethoxymethylsilane; MDESSilane USi-6120 is a high-purity methyldiethoxysilane (MDES)—a non-organoreactive alkyl alkoxysilane featuring one inert methyl group and two hydrolyzable ethoxy groups. With lower crosslinking density than trialkoxysilanes, it serves as a key chemical intermediate in the synthesis of functional organosilanes and as a modifier for controlled hydrophobization in specialty formulations.
🧪 Product Description
Chemical Formula: CH₃Si(OC₂H₅)₂H
Chemical Structure:
![Structure: CH₃–SiH(OC₂H₅)₂]USi-6120 contains a reactive Si–H bond in addition to two ethoxy groups and one methyl group. This unique structure enables dual reactivity:
- The Si–H bond participates in hydrosilylation reactions with alkenes/alkynes (catalyzed by Pt)
- The ethoxy groups can undergo hydrolysis and condensation under acidic or basic conditions
Unlike coupling agents such as amino or epoxy silanes, USi-6120 is primarily used as an intermediate, not a direct surface treatment agent. Its main value lies in synthesizing more complex silanes with tailored functionality.
📊 Typical Technical Data
The following values are typical and not intended for specification. Please confirm with our technical team before finalizing product requirements.
Parameter Specification Appearance Colorless transparent liquid Specific Gravity (20°C) 0.824 – 0.834 g/cm³ Refractive Index (nD25) 1.3225 – 1.3325 Purity (GC, %) ≥ 99.0%
🏭 Key Applications
🔹 Intermediate for Functional Organosilane Synthesis
- Serves as a precursor in hydrosilylation to produce:
- Alkyl-, fluoro-, or polyether-modified silanes
- Silicone surfactants, adhesion promoters, and surface modifiers
- Enables precise molecular design of silanes with custom organic tails
🔹 Modifier in Silicone Polymers & Resins
- Used to introduce methyl and ethoxy functionality into silicone backbones
- Helps control molecular weight, viscosity, and reactivity during polymerization
- Can act as a chain terminator or end-capper
🔹 Controlled Hydrophobization Agent
- When partially hydrolyzed, forms low-crosslink-density networks that impart water repellency without brittleness
- Suitable for applications requiring flexible hydrophobic layers on inorganic surfaces
🔹 Reducing Agent & Crosslinker in Specialty Systems
- The Si–H group can act as a mild reducing agent in certain catalytic systems
- Participates in Moisture-cure or Pt-cure hybrid systems for coatings and sealants
📦 Packaging
Available in industrial-grade containers:
- 25 L pail
- 200 L drum
- 1,000 L IBC tote
All packaging is sealed to prevent moisture exposure and preserve Si–H reactivity.
⚠️ Safety & Storage
- Store in original unopened containers at or below 35°C
- Keep away from heat and open flame (product is flammable)
- Shelf Life: 12 months from production date under recommended conditions
- Avoid contact with water, strong oxidizers, and bases (may release ethanol or cause exothermic reaction)
- Use in well-ventilated areas; wear appropriate PPE
- Consult the latest Safety Data Sheet (SDS) at www.usi-chemical.com or upon request
📞 Contact Us
Nanjing Union Silicon Chemical Co., Ltd.
Your Partner in High-Purity Silane Intermediates for Advanced Material Innovation- Headquarters:
Room 2002, Overseas Chinese Plaza, No.1 Daqiao North Road, Nanjing 210031, Jiangsu, P.R. China - Factory Address:
Dongcheng Guanli District, Gaizhou 115200, Liaoning, P.R. China - Tel: +86-25-5889 5266 / 5889 5699
- Fax: +86-25-5830 5349
- Website: www.usi-chemical.com
- Email: inquiry@usichemical.com
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