Wechat Code
Methyltriethoxysilane (MTES) CAS Number: 2031-67-6
CAS No. 2031-67-6
Synonyms Triethoxymethylsilane
Molecular Formula CH3 Si (OCH2CH3)3
Molecular Weight 178.3
Boiling Point 143℃
Flash Point 23℃
Related Density 0.89 ( in water)
20+ years supplying history;
No claims;
Good and stable quality; Stable supplying;
SGS testing approved; EMTEK, SRICI tested; ISO:90012/ 2015 certified, AAA Credit certified;
Delivery Time: 15-20 days;
Audit acceptable;
Competitive price;
Bigbags Packing; On pallets; IBC packing;
| Testing Item | Standard |
| Assay (%) | 99.0 Min |
| Density (25℃) (g/cm3) | 0.899±0.020 |
| Refractive Index (nD25) | 1.3800 -1.3865 |
| pH Value | 6.0 - 8.0 |
| Appearance | Colorless Transparent Liquid |
HS code: 29310095
CAS No.: 2031-67-6
UN No.: 1993
EINECS: 217-983-9
Hazard Class: 3
Packing Type: III
● Packages:
180kgs iron drum lined with PVF
Features
Chemical Name: Methyltriethoxysilane
Abbreviation: MTES
Odor: Mild alcohol-like odor
Density: ~0.94 g/cm³ (at 25°C)
Solubility: Reacts with water (hydrolyzes to form ethanol and silanols); soluble in organic solvents
Flammability: Flammable liquid
Handling
1. Flammable liquid and vapor.
2. Avoid breathing vapors or mist.
3. Avoid contact with skin, eyes, and clothing.
4. Use only in well-ventilated areas with local exhaust ventilation.
5. Wear appropriate PPE: chemical-resistant gloves (nitrile/butyl), safety goggles or face shield, and protective clothing.
6. Keep away from heat, sparks, open flames, and hot surfaces.
7. Ground and bond containers during transfer to prevent static discharge.
8. Avoid contact with moisture — hydrolyzes to form ethanol.
9. Wash thoroughly after handling.
Storage
1. Store in a cool, dry, well-ventilated area.
2. Keep container tightly closed to prevent moisture ingress.
3. Protect from heat, ignition sources, and direct sunlight.
4. Nitrogen blanketing recommended for bulk storage.
5. Store away from oxidizing agents, acids, and bases.
6. Use approved flammable liquid storage facilities and containers.
7. Follow local regulations for storage of flammable chemicals.
1. Silicone Resin Manufacturing
MTES is a key raw material for:
Methyl silicone resins
Heat-resistant coatings
Electrical insulating varnishes
Weather-resistant paints
Anti-corrosion coatings
Its trifunctional structure enables formation of dense three-dimensional siloxane networks with superior thermal and UV stability.
2. Construction Water Repellents
MTES is widely used for hydrophobic treatment of:
Concrete
Masonry
Natural stone
Cement-based materials
It penetrates porous substrates and reacts with surface hydroxyl groups to create durable water-repellent protection without significantly affecting vapor permeability.
3. Crosslinking Agent in Silicone Systems
MTES functions as a moisture-curable crosslinker in:
RTV silicone sealants
Adhesives
Silicone elastomer formulations
It enhances mechanical strength, chemical resistance, and environmental durability.
4. Sol–Gel and Hybrid Materials
In sol–gel chemistry, MTES is used to produce:
Hydrophobic silica networks
Organic–inorganic hybrid coatings
Protective thin films
Aerogel precursors
It contributes flexibility compared to purely inorganic silane systems.
5. Surface Modification & Filler Treatment
MTES improves compatibility between:
Mineral fillers
Glass fibers
Metal oxides
Silicone or resin matrices
Applications include composite materials and reinforced coatings.
OUR MARKET
Up till now we’ve developed and supplied to many countries and areas all over the world, with main markets in European countries (Germany, Italy, UK, Spain, Ukraine, Russia, Poland, etc.), USA, South America, Mid East, South-east Asia, Australia, etc. Also seeking more strategic partners and customers under mutual benefits and work through the whole purchasing chain.
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Vietnam
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India
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Belgium
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USA
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Czech Republic
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Mexico
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Colombia
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Singapore
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Ecuador
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Peru
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Russia
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Turkey
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Costa Rica
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Chile
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Indonesia
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Pakistan
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