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HS Code |
534067 |
| Chemical Name | Methyltriethoxysilane |
| Chemical Formula | C7H18O3Si |
| Molecular Weight | 178.30 g/mol |
| Cas Number | 2031-67-6 |
| Appearance | Colorless liquid |
| Odor | Ester-like |
| Boiling Point | 143-145°C |
| Density | 0.895 g/cm3 at 25°C |
| Flash Point | 41°C (closed cup) |
| Refractive Index | 1.389 at 20°C |
| Solubility | Reacts with water, soluble in organic solvents |
| Vapor Pressure | 8 mmHg at 20°C |
As an accredited Methyltriethoxysilane factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Methyltriethoxysilane is packaged in a 25-liter blue HDPE drum, tightly sealed with a tamper-evident cap and clear labeling. |
| Shipping | **Methyltriethoxysilane** should be shipped in tightly sealed containers, protected from moisture and incompatible substances. It must be handled as a flammable liquid according to UN 1993 regulations. Store and transport in a cool, well-ventilated area, away from heat or ignition sources, following all relevant hazardous material shipping regulations. |
| Storage | Methyltriethoxysilane should be stored in tightly closed containers in a cool, dry, and well-ventilated area. Keep away from moisture, heat, sparks, open flames, and incompatible substances such as strong acids or oxidizers. Protect from direct sunlight. Use only with proper grounding and explosion-proof equipment. Store under inert atmosphere if possible, and ensure containers are properly labeled. |
Applications of Methyltriethoxysilane in Industrial ManufacturingMethyltriethoxysilane supports multiple specialized sectors by improving chemical integration in advanced formulations and processing environments. As direct manufacturer, we supply this material for critical industrial applications where specified performance, adherence to standards, and defined processing steps are required for high-value outputs. 1. Crosslinker for Room-Temperature Vulcanizing (RTV) Silicone SealantsRTV silicone sealant production relies on methyltriethoxysilane as a pivotal crosslinking agent. It reacts with silanol-terminated polydimethylsiloxane and atmospheric moisture, forming durable networks at room temperature. This role ensures weather resistance, flexibility, and substrate adhesion in construction and electronics. Controlled dosage affects the mechanical and curing properties, requiring strict monitoring per batch for consistent performance in civil building joints, glazing, and electronic device encapsulation. Industry compliance standards
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2. Surface Modifier for Silica and Mineral FillersMethyltriethoxysilane is utilized to functionalize silica, alumina, and other mineral fillers for the plastics and elastomers industries. It forms covalent bonds with surface hydroxyl groups, reducing filler agglomeration and improving dispersion in polymer matrices. This surface treatment process enhances filler compatibility with organic resins, optimizing mechanical performance and surface quality in high-performance composites, engineered plastics, and synthetic rubber compounds. Industry compliance standards
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3. Precursor for Hybrid Organic–Inorganic Sol–Gel CoatingsMethyltriethoxysilane acts as a sol–gel precursor in producing transparent abrasion-resistant and anti-corrosion coatings for glass, metal, and plastic substrates. Its organofunctional group provides controlled hydrophobicity while the silane backbone integrates into hybrid networks via hydrolysis and condensation in acidic or basic sol–gel systems. Carefully calibrated reaction parameters govern film thickness, abrasion level, and environmental resistance in optical, photovoltaic, and automotive glazing applications. Industry compliance standards
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4. Adhesion Promoter in Industrial Paints and Protective CoatingsMethyltriethoxysilane boosts adhesion between organic binders and metallic, mineral, or glass substrates in industrial coatings. Its ability to chemically bridge inorganic surfaces and polymeric films enhances paint durability, pigment dispersion, and resistance to delamination under humidity and thermal cycling. Formulators can tune the silane introduced in primer layers to suit substrate nature and downstream processing conditions, ensuring reliable bonding in marine, industrial, and heavy-equipment applications. Industry compliance standards
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5. Water Repellent for Building MaterialsThis silane is used in the building materials industry as a key ingredient in the manufacture of water-repellent admixtures and surface treatments for concrete, masonry, and bricks. Its hydrolyzed form penetrates the pores of construction substrates, bonding to siliceous surfaces and significantly reducing water absorption without altering breathability. This process markedly increases the durability and freeze-thaw resistance of mineral construction materials in exposed environments. Industry compliance standards
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6. Intermediate in Silane-Terminated Polyether (STP) AdhesivesThis chemical allows precise end-capping of polyether prepolymers via hydrosilylation reactions, producing moisture-curing adhesives. The methyl functional group provides improved substrate wetting while maintaining elastic properties in the cured adhesive. Manufacturers of STP adhesives use this raw material for products with low VOC profiles and enhanced mechanical strength. This is especially pertinent in construction, automotive assembly, and industrial maintenance applications. Industry compliance standards
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In the world of organosilicon chemistry, methyltriethoxysilane (CAS 2031-67-6) takes on a role people rarely see but regularly benefit from. Our team has been synthesizing this compound in tonnage quantities since the mid-1990s, adjusting process parameters after years of plant trial and error to deliver tight quality every single batch. Most technical users know it by its shorthand, MTES. It appears as a clear, almost colorless liquid, easily pours, and emits a mildly sweet, alcoholic smell right off the drum. Our standard product holds a purity of 98% or higher, with methanol, ethanol, and trace impurities kept tightly under control.
Direct feedback from both in-house quality teams and leading coating formulators keeps our attention on hydrolysis rate, alkoxy group retention, and how quickly the silane network forms. Over the years, requests have come in for tailored specifications—like tighter water content, extra filtration, or special packaging. Each time, plant chemists compare how changes impact downstream customer performance, whether it be in crosslinking efficiency or film durability. The molecular model remains simple: a methyl group connected through a silicon atom to three ethoxy groups. This minimalistic skeleton produces reliable results across several end uses.
Many people see silane chemistry as interchangeable. We have learned that even subtle changes in R-group or alkoxy side chain determine fit for service. Methyltriethoxysilane has consistently delivered in industries where surface treatment, crosslinking, and reactive bonding are non-negotiable. Our regular customers come from silane-crosslinkable polyethylene extrusion, water repellent treatment, glass fiber finishing, and sol-gel condensation fields. In each scenario, the silane's dual chemical handles—a mildly hydrophobic methyl and highly reactive ethoxys—make the difference.
In manufacturing plants for crosslinked polyethylene (PEX) pipes, one operator explained how MTES creates uniform bonds within polymer matrices. The ethoxy groups hydrolyze and condense under controlled humidity, locking in flexibility and raising chemical resistance. Unlike bulkier silanes, methyltriethoxysilane delivers a good balance: efficient crosslinking without slowing extrusion throughput. Technical comparisons to longer-chain silanes show MTES yields a uniform, subtle hydrophobization as opposed to the waxier finish created by octyl or phenyl analogs.
On the construction materials side, technologists use methyltriethoxysilane as an ingredient in systems designed to repel water from porous surfaces. Concrete, brick, and natural stone gain substantial resistance after silane treatment. By penetrating and binding covalently to silica or alumina in the base material, MTES sharply reduces water absorption, thus lowering the risk of freeze-thaw damage and efflorescence. This differs from heavier silanes, which can sit on the surface, leaving behind excess residue or slippery coatings many clients aim to avoid.
Consistency starts with raw materials. Our plant technical team sources ethanol and methylchlorosilane under long-term contracts, rejecting batches that fail our strict GC-MS impurity profile. Years back, early challenges with trace water carryover in feedstock tanks led to visible quality shifts: bottles fell out of specification, finished product clouded up, and end users reported gelling during application. By dropping our threshold for water content and refining our distillation sequence, this problem faded into history.
Our technical process steps go beyond basic reaction control. We use closed-loop drying columns, precision temperature monitoring, and inline refractive index detection. Plant operators and chemists carry out regular spot checks on silanol content, a crucial quality pointer, especially in glass-treating applications that can tolerate zero free acid or residual alcohol. By catching off-spec fractions at the source, reprocessing occurs before the product ever leaves our main tanks.
Customer feedback also directs incremental improvements. Glass fiber finishers once reported batch-to-batch variance in surface bonding. Post-delivery investigations traced the problem to minor retention of reaction by-products. The solution involved adding a vacuum stripping stage, dropping trace residuals below analytical detection. Since then, customer rejection rates dropped near zero, boosting acceptance for our MTES across multiple textile fiber plants.
We have heard questions from procurement teams about how methyltriethoxysilane compares to similar silanes. Many think alkyltriethoxysilanes blend together, but plant experience shows that methyl cuts a unique profile. The methyl group is smaller and more electron-donating compared to propyl, octyl, or phenyl variants, leading to faster hydrolysis under neutral or mildly acidic conditions. This fits perfectly for users running room-temperature hydrolysis to prepolymerize siloxane networks before applying on glass, sand, or aluminum.
In a side-by-side spray test, technicians observed that MTES-treated mineral surfaces dried more rapidly, left a cleaner residue profile, and showed less substrate darkening than octyltriethoxysilane. This makes it useful in transparent or white pigmented finishes, where color retention and clear appearance trump water repellency alone. Production staff consistently find that methyltriethoxysilane achieves high coverage rates without the waste or looming health concerns often associated with bulkier, more volatile silanes.
For blend formulations, methyltriethoxysilane holds a niche among three ethoxysilane options: tetraethoxysilane, methyltriethoxysilane, and octyltriethoxysilane. Compared to TEOS, which often leads to rigid, brittle films, methyltriethoxysilane brings both flexibility and strong substrate adherence, especially in thick or multi-layered coating systems. In organofunctional variants, like aminopropyltriethoxysilane or mercaptopropyltriethoxysilane, reactivity swings far higher, leading to aggressive crosslinking in epoxy or rubber compounds. Methyl stands as a middle ground—a stable, predictable builder with balanced reactivity.
Our experience hasn't come without hiccups. Difficulties crop up with packaging, storage, and shelf stability. In years past, regular customers reported some cases of polymerization or gel development inside drums left open in high-humidity climates. We traced these issues to slow hydrolysis triggered by moisture exposure. As a fix, our warehouse switched to internally lacquered drums and introduced strict moisture barrier checks before every filling. Now, product shelf life extends reliably beyond one year when kept sealed under nitrogen.
Handling also matters. Field techs often ask about storage incompatibility with metals or certain plastics. Methyltriethoxysilane gradually corrodes some unlined steel containers, especially as residual water collects at the bottom. We recommend HDPE, stainless, or lined containers, based on failed tests and visual corrosion confirmed during audit visits. In formulating environments, operators must keep containers out of direct sunlight and maintain temperatures below 35°C. Missed handling steps in the past led to batch spoilage, sticky residues, or failures in performance tests.
Waste management creates another headache. Methyltriethoxysilane does not simply evaporate harmlessly; hydrolysis produces ethanol and silanol intermediates, requiring careful venting and solvent recovery. Early plant installations with improper vapor capture once caused environmental concerns and lower yield. After correcting this with closed reactor heads, secondary condensers, and ethanol scrubbers, we minimized both production losses and community risk, satisfying downstream audits and earning long-standing supplier approval.
Demand for more sustainable chemistry grows stronger every year. Many downstream users ask whether methyltriethoxysilane meets current environmental expectations. Our experience shows while regulatory status remains favorable, any chemical entering water or air without controls risks violations. We maintain continuous air monitoring and hold full documentation on volatile organic compound (VOC) levels. Transport teams receive training on emergency containment, and we keep stocks of neutralization agents for accidental spills or leaks during plant maintenance.
Several customers in the EU have tested our batches in REACH registration contexts, confirming compliance with accepted risk phrases and environmental endpoints. Our team works with buyers to provide up-to-date safety data and technical files upon request. In recent work with a solar panel encapsulation developer, we tracked migration and environmental persistence under high-heat cycling, supporting confidence in the product’s long-term stability and minimal environmental footprint in encapsulated form.
With society scrutinizing chemical producers, we maintain open reporting and encourage third-party system audits. Over the past decade, no major incident or non-compliance warning arose relating to our methyltriethoxysilane production line. This provides comfort not just to regulators, but to our colleagues in logistics, plant operation, and downstream manufacturing who face the daily consequences of chemical choices.
Many partners approach us with technical questions about integrating methyltriethoxysilane into their production, especially during new product launches. Our in-house team has helped dozens of customers move from lab experiments to commercial scale. We recommend mixing MTES away from moisture and ensuring precise dosing to limit waste. In glass fiber sizings, we help tailor addition sequences to guarantee covalent bonding, watching the pH closely and often buffering solutions to around neutral.
In polyethylene cable insulation, customers benefit from our factory’s accumulated dosing experience. Too much silane can plasticize the matrix and undermine mechanical strength; too little leads to incomplete netting and poor long-term durability. It took many cycles of field failures and joint investigations before we dialed in optimal addition levels. We recommend trial pilot batches, followed by mechanical and aging tests, before locked production recipes.
More recently, customers in the automotive industry adopted MTES for lightweight composites, in-mold coatings, and electrical insulation. Here, formula tinkering occurs. Some add catalysts or blend with other silanes to tailor reaction rate. Our technical support lab often receives product samples from customers testing against alternative silanes. Often, methyltriethoxysilane shows fewer color and viscosity shifts during processing. This manifests in lower rejection rates and more predictable production schedules upstream.
Direct feedback shapes our plant’s offerings. One long-term customer in the wood protection market reported handling delays due to excessive residue after treatment. Our technical team upgraded pre-filtration and adjusted final distillation cut points to produce a cleaner, lower residue product. Field re-tests reported a dramatic improvement. This close-knit partnership keeps our staff grounded and reminds us that chemical manufacturing continues to evolve with every use case.
Logistics also come up in customer requests. Years ago, a performance coatings formulator required smaller batch sizes delivered just-in-time to eliminate storage constraints. Our team worked with them to offer 50-liter returnable stainless kegs, ensuring fresh supply and minimizing wastage. Not every request fits standard production, but operating our own plant means we stay nimble in responding to what makes sense for the real-world users.
From specialty paper coatings to advanced sol-gel ceramics, users value not just the chemistry but the reliability of the supply chain. With global disruptions over recent years, our plant invested in local raw material warehouses and redundant process lines. As demand shifts, we scale up or down without risk of overinventory or project shutdowns—keeping both our operation and downstream partners nimble.
Methyltriethoxysilane continues to secure orders not through marketing, but by proving its value in large and small applications. Our team watches for new developments in green chemistry, composites, barrier technologies, and water-borne systems. We collaborate both with long-standing buyers and first-time users to trial, test, and adapt the product as global standards evolve and end-use requirements become stricter.
Decades invested in formulation troubleshooting, production tweaks, and user feedback have sharpened our ability to deliver what customers actually seek: performance, predictability, and support. From our perspective on the factory floor, methyltriethoxysilane reaffirms the strength found in the simple silane backbone—a reliable building block supporting innovation in industries that touch millions of lives.
