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Methyltriacetoxysilane is a clear to yellowish liquid with acrid odor of acetic acid (vinegar).
Methyltriacetoxysilane hydrolyzes in the presence of moisture (acetic acid is released) to form silanols, which can react with themselves to pro-duce siloxanes or bind to inorganic substrates.
Methyltriacetoxysilane is a chemical compound with the molecular formula (CH3COO)3SiCH3.
CAS Number: 4253-34-3
Molecular Formula: C7H12O6Si
Molecular Weight: 220.25
EINECS Number: 224-221-9
Synonyms: Methyltriacetoxysilane, 4253-34-3, Methylsilanetriyl triacetate, Silanetriol, methyl-, triacetate, triacetoxy(methylsilane), Silanetriol, 1-methyl-, 1,1,1-triacetate, EINECS 224-221-9, NSC 139845, BRN 1788668, DTXSID0027565, DTXCID507565, EC 224-221-9, 4-04-00-04208 (Beilstein Handbook Reference), CM8980, Silane, methyltriacetoxy, Silanetriol, methyl, triacetate, Silanetriol, 1methyl, 1,1,1-triacetate, 224-221-9, RefChem:158342, TVJPBVNWVPUZBM-UHFFFAOYSA-N, Triacetoxy(methyl)silane, Triacetoxymethylsilane, Methylsilanetriol triacetate, Silane, methyltriacetoxy-, Methyltrihydroxysilane triacetate, [diacetyloxy(methyl)silyl] acetate, C7H12O6Si, MFCD00008694, W4FX3GZ7AB, NSC-139845, APK 1 (silane derivative), K 10S, [diacetoxy(methyl)silyl] acetate, methyltriacetoxysilan, methyl triacetoxysilane, UNII-W4FX3GZ7AB, CH3Si(OCOCH3)3, TRIACETYLMETHYLSILANE, APK-1, SCHEMBL63651, Methyltrihydroxysilanetriacetate, CHEMBL3184776, Methylsilanetriyl Triacetate, Mtas, bis(acetyloxy)(methyl)silyl acetate, SIM-6519, TSL-8180, Tox21_200663, NSC139845, AKOS008901251, ZH-1103, NCGC00248787-01, NCGC00258217-01, BS-44113, CAS-4253-34-3, NS00047847, T1786, F21301, Triacetoxy(methyl)silane, technical grade, 90%, Methyltriacetoxysilane-Ethyltriacetoxysilane 80:20 Blend LABOTEST-BB LT01406986, apk1(silanederivative), k10s, methylsilanetrioltriacetate, methyl-silanetriotriacetate, methyltriacetoxy-silan, Methylsilanetriyl triacetate, METHYLTRIACETOXYSILANE
Methyltriacetoxysilane plays a crucial role as a coupling agent and surface modifier in enhancing the performance and durability of materials in various industrial applications, where improved adhesion and compatibility are required.
Methyltriacetoxysilane is an organosilicon compound characterized by a silicon atom covalently bonded to a single methyl group and three acetoxy groups (-OCOCH₃), giving it the chemical formula CH₃Si(OCOCH₃)₃ and the IUPAC name Silanetriol, methyl-, triacetate.
This molecular structure imparts unique reactivity, as the silicon–oxygen bonds in the acetoxy groups can undergo hydrolysis in the presence of water, releasing acetic acid and generating reactive silanol (Si–OH) groups, which makes the compound a versatile precursor in silane chemistry and surface modification applications.
Methyltriacetoxysilane is a colorless or light yellow transparent liquid with a strong acetic acid odor.
Methyltriacetoxysilane is most commonly used as a cross-linking agent of vulcanized silicone rubber and silicone sealant.
Methyltriacetoxysilane is a mixture of MTAS (methyl tri acetoxy silane) & PTAS (propyl tri acetoxy silane).
Acts as a crosslinking agent of vulcanizing silicone rubber and acetoxy sealant and can crosslink with water to generate acetic acid.
Methyltriacetoxysilane has strong acetic acid smell and appears as colorless to light yellow transparent liquid.
Possesses low freezing point and can prolong shelf life.
Methyltriacetoxysilane improves tensile strength, elongation, anti-aging property and flexibility of silicone sealant.
Methyltriacetoxysilane is a colourless to yellowish liquid, not miscible with water, decomposes with water and moisture under formation of acetic acid.
Methyltriacetoxysilane, also known as Triacetoxy(methyl)silane, is a chemical compound with the molecular formula C7H12O6Si.
Methyltriacetoxysilane is a silane derivative, specifically a methylsilanetriyl triacetate, with the structural formula CH3Si(OCOCH3)3.
Methyltriacetoxysilane is widely used in various applications, including coatings, adhesives, and as a precursor for the synthesis of other silane derivatives.
Methyltriacetoxysilane is a colorless liquid with a molecular weight of 208.25 g/mol.
Methyltriacetoxysilane is soluble in a variety of organic solvents, including acetone, ethanol, and toluene.
Methyltriacetoxysilane is used as a cross-linking agent in coatings and adhesives, providing improved thermal stability and resistance to chemicals.
Additionally, Methyltriacetoxysilane serves as a precursor for the synthesis of other silane derivatives, which are used in a range of applications, including catalysis, materials science, and biomedicine.
Methyltriacetoxysilane is typically a colorless to pale yellow liquid with low viscosity and moderate volatility, and it is soluble in many organic solvents, such as alcohols, ethers, and hydrocarbons, but reacts slowly with water due to hydrolysis.
The presence of the methyl group bonded directly to silicon provides hydrophobic character and chemical stability, which is advantageous in coating, adhesive, and polymer formulations where controlled reactivity and water resistance are important.
Methyltriacetoxysilane is extensively used in materials science and chemical synthesis because its reactive acetoxy groups can participate in condensation reactions with hydroxyl-containing surfaces or polymers, forming siloxane linkages (Si–O–Si) that enhance adhesion, chemical resistance, and mechanical strength.
Methyltriacetoxysilane is commonly applied in silane coupling agents, surface treatments for glass or metal, crosslinkers for polymer networks, and precursors for silicone-based materials, where its ability to generate reactive silanol groups in situ allows for precise control over surface modification and polymer crosslinking.
Melting point: 40-45 °C (lit.)
Boiling point: 94-95 °C at 9 mmHg (lit.)
Density: 1.20 g/mL at 20 °C (lit.)
Vapor pressure: 0.053-26 Pa at 20-25℃
Refractive index: 1.52-1.522
Flash point: 185 °F
Solubility: Soluble in Methanol
Form: Solid
Specific Gravity: 1.175
Color: White or Colorless to Almost White or Almost Colorless
Odor: Acrid odor
Water Solubility: 1000 g/L at 20℃
Hydrolytic Sensitivity: 7 – reacts slowly with moisture/water
Sensitive: Moisture Sensitive
BRN: 1788668
InChIKey: TVJPBVNWVPUZBM-UHFFFAOYSA-N
LogP: -2.4 at 20℃
Methyltriacetoxysilane is valued in industrial applications such as water-repellent coatings, adhesion promoters in composite materials, sealants, and epoxy resins, where the combination of hydrophobicity, reactivity, and siloxane formation potential ensures improved performance and durability of treated surfaces.
Its chemical versatility and capacity to act as both a reactive intermediate and functional additive make it a critical component in advanced material formulations, high-performance coatings, and specialty silicone chemistries.
Methyltriacetoxysilane is an organosilicon compound in which a central silicon atom is bonded to one methyl group and three acetoxy groups (-OCOCH₃), giving it both hydrophobic character from the methyl group and reactive potential from the acetoxy groups, which allows it to act as a highly versatile silane reagent in chemical synthesis and material science applications.
Its acetoxy groups can hydrolyze in the presence of moisture or water, releasing acetic acid and generating reactive silanol groups (Si–OH) that can subsequently condense to form strong siloxane bonds (Si–O–Si), enabling the functionalization of surfaces, formation of crosslinked polymer networks, or incorporation into advanced siloxane-based materials.
Physically, Methyltriacetoxysilane is typically a colorless to pale yellow liquid with low viscosity and moderate volatility, soluble in organic solvents such as alcohols, ethers, and hydrocarbons, but it is sensitive to moisture, requiring careful handling and storage in dry, airtight containers to prevent premature hydrolysis.
Its chemical structure imparts thermal and chemical stability, while the presence of the methyl group enhances hydrophobicity, which is advantageous in applications where water resistance, adhesion, or protective coatings are desired.
In practical use, Methyltriacetoxysilane is widely applied as a silane coupling agent, where it improves adhesion between inorganic surfaces like glass, metal, or ceramics and organic polymers, facilitating the creation of durable composite materials and high-performance coatings.
Methyltriacetoxysilane is also employed as a crosslinker or functional additive in polymers, resins, and sealants, where its ability to generate siloxane networks in situ enhances mechanical strength, chemical resistance, and surface durability.
Additionally, Methyltriacetoxysilane is valuable in the production of silicone-based materials, including water-repellent coatings, protective films, adhesives, and epoxy resin systems, where its dual functionality—reactivity via acetoxy groups and hydrophobicity via the methyl group—allows precise control over curing, surface treatment, and polymer network formation.
Its versatility makes it a key intermediate in industrial silane chemistry, surface modification processes, and advanced material design, bridging the gap between organic and inorganic chemistry to produce materials with enhanced adhesion, chemical stability, and environmental resistance.
Uses Of Methyltriacetoxysilane:
Methyltriacetoxysilane is used as a silane coupling agent.
Methyltriacetoxysilane is extensively used in materials science, polymer chemistry, and surface treatment applications, primarily because its three acetoxy groups can undergo hydrolysis to form reactive silanol groups (Si–OH), which then condense to form strong siloxane bonds (Si–O–Si), enabling the creation of highly durable and chemically resistant coatings, adhesives, and polymer networks.
In the coatings and paints industry, it functions as a surface coupling agent and adhesion promoter, improving the bonding between inorganic substrates such as glass, ceramics, or metals and organic polymer matrices, which results in enhanced durability, water repellency, chemical resistance, and mechanical integrity of the coated surfaces.
In polymer and resin chemistry, Methyltriacetoxysilane serves as a crosslinker and functional additive, where its ability to generate siloxane networks in situ increases the strength, thermal stability, and dimensional stability of epoxy resins, polyurethane systems, and other thermosetting polymers, making it especially valuable in high-performance composite materials and advanced engineering applications.
Methyltriacetoxysilane is also applied in the production of silicone-based materials, such as sealants, water-repellent coatings, protective films, and elastomers, where its dual functionality—hydrophobic methyl group and reactive acetoxy groups—allows precise control over curing, crosslink density, and surface properties, enhancing both chemical resistance and adhesion.
Furthermore, Methyltriacetoxysilane is employed in surface modification and chemical functionalization processes, where it reacts with hydroxyl-rich surfaces to form a durable silane layer, improving surface hydrophobicity, chemical inertness, and compatibility with organic polymers, which is critical in glass treatment, electronic component protection, and metal surface coatings.
In industrial formulations, it can also act as a reactive intermediate in the synthesis of specialty silanes, hybrid organic–inorganic materials, and advanced coatings, providing tailored reactivity and performance characteristics for applications requiring high mechanical strength, environmental stability, and resistance to moisture or chemical exposure.
Its versatility and controlled reactivity make Methyltriacetoxysilane a key ingredient in adhesives, sealants, composites, water-repellent coatings, high-performance polymer networks, and advanced material systems, bridging the gap between organic polymer chemistry and inorganic surface engineering to deliver enhanced mechanical, chemical, and environmental performance in industrial and research applications.
Methyltriacetoxysilane is widely employed in advanced materials engineering and industrial chemistry due to its unique combination of reactive acetoxy groups and a hydrophobic methyl group, which allows it to function simultaneously as a crosslinking agent, surface modifier, and adhesion promoter, making it invaluable for enhancing the mechanical strength, chemical resistance, and water repellency of a wide range of polymeric and composite materials.
In coating technologies, it is utilized to improve bonding between inorganic substrates such as glass, metals, and ceramics and organic resins, creating highly durable protective films, corrosion-resistant layers, and weather-resistant surfaces that are essential in industries such as construction, aerospace, automotive, and electronics.
In the polymer and resin manufacturing sector, Methyltriacetoxysilane is used as a functional additive and crosslinker for epoxy resins, polyurethanes, silicones, and other thermosetting systems, where the hydrolysis of its acetoxy groups generates silanol groups that undergo condensation to form robust siloxane networks, thereby improving the dimensional stability, thermal tolerance, chemical inertness, and long-term mechanical performance of the final materials.
Its capacity to form covalent bonds with both organic and inorganic phases allows manufacturers to produce hybrid materials, high-performance adhesives, sealants, elastomers, and composite laminates with optimized adhesion, toughness, and resistance to moisture or aggressive chemicals.
In addition, Methyltriacetoxysilane finds applications in surface treatment and functionalization processes, where it reacts with hydroxyl-containing surfaces to create covalently bonded silane layers, providing enhanced surface hydrophobicity, corrosion protection, and compatibility with subsequent coatings or polymer overlays.
This property is particularly important in glass treatment, electronic device protection, metal surface modification, and high-performance composite fabrication, where controlled silanization improves adhesion, chemical durability, and environmental stability.
Safety Profile Of Methyltriacetoxysilane:
Methyltriacetoxysilane is highly reactive with moisture, and contact with the skin can cause moderate to severe irritation, redness, itching, and potential dermatitis, particularly when exposure is prolonged or repeated. Direct contact with the eyes can lead to painful irritation, watering, redness, and temporary discomfort, emphasizing the importance of wearing protective gloves, long-sleeved clothing, and safety goggles when handling the chemical in laboratory or industrial settings.
2. Respiratory Hazards
Inhalation of vapors, mist, or aerosols of Methyltriacetoxysilane can irritate the mucous membranes of the nose, throat, and respiratory tract, causing coughing, throat discomfort, mild shortness of breath, or respiratory irritation.
Because the compound undergoes hydrolysis to produce acetic acid vapors, poorly ventilated environments may increase exposure risks.
Therefore, adequate ventilation, fume hoods, and respirators are recommended when working with this chemical, especially in processes that generate airborne particles or mist.
Methyltriacetoxysilane is chemically reactive, particularly with water, alcohols, amines, and other hydroxyl-containing compounds.
Upon contact with moisture, it can hydrolyze to release acetic acid, which can cause local corrosion, chemical burns, or irritation.
Methyltriacetoxysilane may also react exothermically with strong acids, strong bases, or oxidizing agents, potentially leading to violent reactions, heat generation, or the release of hazardous byproducts, so storage and handling must avoid these incompatible chemicals.
