Methyltriethoxysilane (CAS 2031-67-6), abbreviated as MTES or triethoxymethylsilane, is a trifunctional organosilane with the molecular formula C₇H₁₈O₃Si and a molecular weight of 178.30 g/mol. It presents as a clear, colourless liquid with a boiling point of approximately 141–143 °C, a flash point in the 23–34 °C closed-cup range depending on the test method, and a density near 0.895–0.90 g/cm³. Its commercial identity rests on a simple but powerful structural asymmetry: the molecule carries three hydrolyzable ethoxy groups and one non-hydrolyzable methyl group on the same silicon atom. When exposed to moisture, the ethoxy groups hydrolyze and condense to form a cross-linked Si–O–Si siloxane network, while the methyl group remains pendant, presenting a low-energy, hydrophobic surface to the environment. That dual behaviour is why MTES is not merely a silane intermediate but a functional building block that determines whether a coating repels water, whether a sealant adheres to a mineral substrate, whether a silicone resin cures to the right hardness, and whether an electronic encapsulant blocks moisture ingress. The global market reflects this breadth and the methodological spread it produces. One research stream values the market at approximately USD 65.75 million in 2025, forecast to reach USD 97 million by 2032 at a 5.7% CAGR, with volume near 14,400 tonnes and an average price around USD 5,000 per tonne. The product is segmented into industrial grade, high-purity grade and electronic grade, differentiated by control of water, chloride and trace metal impurities. China is a major production base with feedstock integration and scale advantages, while European and Japanese producers retain positions in high-purity, electronic-grade and specialty applications where consistency and documentation determine qualification. For buyers, the qualifying question is not whether MTES hydrolyzes—it does, readily—but whether a given lot delivers the purity, moisture control and batch consistency that a hydrophobic coating or an electronic encapsulation process can rely on.
Core Application Fields and Demand Architecture
MTES demand concentrates in four functional arenas where its trifunctional ethoxy chemistry and pendant methyl group create performance that other silanes cannot match: silicone resins and intermediates, construction sealants and water repellents, coatings and surface treatment, and sol–gel precursors for electronics and advanced materials.
In silicone resins and intermediates, MTES is a core building block for methyl-silicone resins, silicone rubber and silicone polymers. The trifunctional ethoxy groups provide the cross-linking density that gives a cured resin its mechanical strength and solvent resistance, while the methyl group contributes hydrophobicity and flexibility. MTES is used in the synthesis of silicone resins for coatings, moulding compounds and laminates, and as an intermediate in the preparation of other organofunctional silanes. This segment is the volume anchor of the MTES market, and its demand tracks the broader silicone materials cycle rather than any single end-use industry.
In construction sealants and water repellents, MTES functions as a hydrophobizing agent and adhesion promoter for mineral substrates. It reacts with the hydroxyl groups on the surface of concrete, stone, mortar and glass, forming a covalent siloxane bond that anchors a hydrophobic methyl layer to the substrate. This is the chemistry behind water-repellent treatments for facades, bridges, parking structures and heritage stone, where the goal is to reduce water absorption and chloride ingress without sealing the substrate and trapping moisture. MTES is also used in sealant formulations and as a cross-linker in moisture-cure systems, where its ethoxy groups react with ambient moisture to cure the sealant in place. The construction segment is large in volume and highly price-sensitive, but it is also where failure is visible: a water repellent that does not bond to the substrate or that hydrolyzes too quickly in the can will fail in the field, and the buyer discovers the problem after the application, not in the Certificate of Analysis.
In coatings and surface treatment, MTES serves as an adhesion promoter, cross-linker and surface modifier. It is used in protective coatings for metal, glass and ceramics, in anti-corrosion systems, and in fillers and pigments where it improves dispersibility, reduces sedimentation and renders the inorganic surface hydrophobic. Thermo Fisher’s product documentation lists its use in non-metal surface treatment, non-aqueous polymer preparation, coatings and sealants, and as a cross-linking agent and adhesion promoter. In anti-corrosion coatings, MTES-modified pigments and fillers have been shown to improve compatibility and interaction with the polymer matrix, contributing to barrier performance and corrosion resistance. This segment values the balance between reactivity and stability: a silane that hydrolyzes too fast creates handling problems and short pot life, while one that is too slow does not bond effectively to the substrate.
The fourth arena is sol–gel precursors for electronics and advanced materials. MTES is a principal monomer in sol–gel processes for preparing methylsiloxane thin films with high transparency, barrier performance and mechanical strength, used as insulating, passivation and encapsulation layers in devices where moisture and oxygen barrier properties are critical, particularly flexible OLEDs. It is also used as a precursor for moisture-resistant coatings and encapsulants for semiconductors, printed circuit boards, sensors and electronic components. This is the fastest-growing and most specification-intensive segment: electronic-grade MTES requires control of water, chloride and trace metals at levels that industrial-grade material does not, and the qualification cycles are long because a failed encapsulant can destroy an entire device batch.
Regulatory Profile: A Flammable, Moisture-Sensitive Liquid Defined by Transport Classification and Purity Control
MTES is not a CMR substance and is not on the SVHC Candidate List. Its regulatory identity is defined instead by its flammability, its moisture sensitivity and the grade-specific purity requirements that determine which applications it can serve.
The transport and hazard classification is the first practical constraint. MTES is classified as a flammable liquid and vapour (H226) and, in some SDS documentation, as a respiratory irritant (H335), with additional notation of skin and eye irritation. The UN number is 1993, hazard class 3, packing group III. This classification governs packaging, labelling and transport documentation: MTES cannot be shipped as a non-hazardous liquid, and the flash point in the low 20s to mid-30s °C means that temperature control and ignition-source exclusion are part of the logistics specification. The PBT and vPvB assessment is recorded as “not applicable,” and the substance is not classified as carcinogenic, mutagenic or reprotoxic. In the United States, MTES is listed on the TSCA Inventory; in the EU, it is subject to REACH obligations and is not an SVHC.
The moisture sensitivity is not a hazard classification, but it is the regulatory-adjacent fact that drives packaging and storage requirements. MTES hydrolyzes on contact with water, and the hydrolysis is not reversible: once the ethoxy groups are consumed, the silane has lost its coupling function and the batch may gel or form a siloxane oligomer that cannot be used as intended. For this reason, MTES must be stored under dry conditions in tightly closed containers, and moisture-sensitive packaging is part of the product specification, not a convenience. The product data sheets explicitly note “moisture sensitive” and advise storage in a dry, well-ventilated place away from strong oxidizing agents and strong acids.
The grade structure is where regulatory and quality requirements converge. Industrial grade MTES is used for general silicone synthesis, construction materials and industrial treatment; high-purity grade serves high-performance resins, fine chemicals and advanced materials; and electronic grade imposes the strictest limits on water, metal ions and other trace impurities for semiconductor and electronic applications. For Russian and EAEU buyers, MTES is imported as a hazardous good, and the documentation expectations are a Russian-language SDS, a Certificate of Analysis reporting purity, water content and chloride, and transport documentation consistent with UN 1993, Class 3, PG III. There is no large-scale domestic production of electronic-grade MTES, and high-purity methylsilanes are explicitly noted in Russian market analysis as imported rather than domestically produced.
Global Supply Structure and Manufacturer Differentiation
Global MTES supply is moderately concentrated at the high-purity and electronic-grade end and more fragmented at the industrial-grade end. The manufacturers profiled in market reporting include Evonik, Wacker Chemie, Dow, Shin-Etsu Silicone, Gelest and Momentive, alongside a cohort of Chinese producers that serve industrial and construction applications and are progressively extending into high-purity segments. The competitive dynamic is shaped by the grade split: industrial-grade MTES competes on scale, feedstock integration and price, while electronic-grade and high-purity MTES compete on impurity control, batch consistency and documentation depth, where European and Japanese producers retain an advantage.
Differentiation operates on three axes that matter more to a formulator than the headline assay. The first is water and chloride control. MTES is moisture-sensitive, and residual water or chloride in the lot affects hydrolysis kinetics, cure behaviour and the corrosion risk of the final coating or encapsulant. A supplier that controls water and chloride to electronic-grade limits, and documents those results lot by lot, can serve applications that an industrial-grade supplier cannot. The second axis is hydrolysis consistency and reactivity. The rate at which MTES hydrolyzes and condenses determines pot life, cure speed and film properties, and a lot that has partially hydrolyzed during storage or transport will behave differently from a fresh lot even if the assay figure is within specification. Suppliers that control moisture ingress through packaging and storage, and that can document the lot’s history, reduce the risk of a formulation failure that the buyer would otherwise attribute to the recipe. The third axis is application-specific grade availability. A supplier that offers industrial, high-purity and electronic grades from the same production platform, with a consistent impurity profile across grades, allows a customer to scale from one application to another without re-qualifying a new source. In a market where the molecule is the same but the grade determines the application, grade breadth and documentation depth are genuine differentiators.
For Russian and EAEU buyers, the supply structure creates a specific dependency. Domestic production of electronic-grade and high-purity MTES is limited, and Russian market analysis notes that high-purity methylsilanes are imported while no domestic projects have been identified. Buyers in coatings, sealants, construction chemicals and electronics therefore depend on imported material, and the practical qualification burden falls on incoming QC: verifying assay, water, chloride and appearance against the Certificate of Analysis, and confirming that the packaging has preserved the material from moisture ingress during transport. This is the context in which a supplier with grade breadth, lot-specific moisture and chloride data and Russian-language documentation support becomes more valuable than a low-cost spot offer.
Regional Demand Dynamics
MTES demand follows the geography of silicone materials, construction activity, coatings production and electronics manufacturing, and it is regionally asymmetric in a way that reflects the grade split.
Asia-Pacific, and China in particular, is the largest production and consumption region for industrial-grade MTES. China’s feedstock integration and scale in methylchlorosilane and ethanol give it a cost advantage in industrial-grade material, and its construction, coatings and silicone resin industries consume large volumes of MTES for water repellents, sealants and resin synthesis. The region is also the fastest-growing market for high-purity and electronic-grade MTES as domestic electronics manufacturing expands, although the electronic-grade segment remains qualification-intensive and European and Japanese producers retain a strong position in the most demanding applications. Demand in the region is bifurcated between price-sensitive industrial applications and documentation-sensitive high-purity applications, and the gap between those tiers is widening as specifications tighten.
Europe and North America are mature, specification-intensive markets. Demand is anchored in silicone resin and sealant production, high-performance coatings, and electronic and advanced materials applications where high-purity and electronic grades command a premium. The European market places weight on REACH compliance, SDS quality and batch consistency, and the presence of established producers provides regional supply security for high-purity grades. North American demand is similarly oriented toward high-purity and specialty applications, with construction and coatings providing a steady industrial-grade base.
Russia and the EAEU form an import-dependent contour. Demand is concentrated in construction water repellents and sealants, coatings and surface treatment, silicone resin production, and a smaller but strategically important electronics and advanced materials segment. Domestic production does not cover high-purity or electronic-grade requirements, and imports from European, Chinese and other Asian producers supply the market. The practical constraints are logistics for a Class 3 flammable liquid, moisture-protected packaging, and documentation that supports incoming qualification—particularly for electronic-grade material, where a failed lot can disrupt a device manufacturing line.
Future Outlook and Strategic Imperatives
The MTES market will grow at a moderate rate—roughly 5.7% by value in the base case—but the quality of that growth is shifting toward high-purity and electronic-grade material, where impurity control and batch consistency matter more than commodity scale.
Three structural forces will shape competition. First, the electronic and advanced materials segment is pulling MTES into higher-value applications where moisture and metal-ion specifications determine qualification. Sol–gel encapsulants for flexible OLEDs, moisture-barrier coatings for semiconductors and sensors, and passivation layers for printed circuit boards all require electronic-grade MTES with documented low water, low chloride and controlled trace metals, and suppliers that can hold those specifications across lots will capture the premium end of the market. Second, the construction and coatings segments will continue to demand industrial-grade MTES for water repellents, sealants and adhesion promoters, but the growth will be volume-led and price-sensitive, and suppliers with feedstock integration will be better positioned to compete. Third, moisture control and packaging integrity will remain the binding constraint on product performance: a supplier that cannot deliver a dry, unhydrolyzed lot in packaging that survives transport will fail in the application regardless of the assay figure, and buyers will increasingly treat packaging and storage documentation as part of the qualification.
For Russian and EAEU buyers, the strategic implication is that MTES procurement should be treated as a grade-and-packaging partnership rather than a price comparison. A lot that has absorbed moisture during transport, or an electronic-grade shipment that arrives without documented water and chloride data, costs more in failed batches and requalification time than the price difference between two suppliers. The lowest-risk source is the one that can match the grade to the application—industrial for construction and resins, high-purity for specialty coatings, electronic for encapsulants—document water and chloride lot by lot, and provide Russian-language SDS and Certificate-of-Analysis support for a product that is already import-dependent in the region.
Shanghai XinChem Co., Ltd. (XinChem)
As a world-leading supplier of organic chemicals, Shanghai XinChem Co., Ltd. (XinChem) offers methyltriethoxysilane (CAS 2031-67-6, MTES) in industrial, high-purity and electronic-grade specifications, serving silicone resin producers, construction chemical manufacturers, coatings and sealant formulators, and electronics and advanced materials customers. Our MTES is supplied with controlled assay, documented water and chloride content, and moisture-protected packaging, supported by the Certificate of Analysis and Russian-language SDS that grade-specific qualification requires.
Technical and Quality Advantages
Grade-Specific Impurity Control: MTES is supplied in industrial, high-purity and electronic grades differentiated by water, chloride and trace-metal limits. For electronic encapsulants and sol–gel barrier layers, the electronic grade is characterized against the moisture and ionic-impurity specifications that determine device reliability, while industrial grade serves construction and silicone resin applications where cost and reactivity are the primary considerations.
Moisture-Protected Packaging and Storage: Because MTES hydrolyzes on contact with water and loses its coupling function once hydrolyzed, XinChem supplies the product in sealed, moisture-barrier packaging and provides storage guidance that preserves the ethoxy content from manufacture to use. This packaging discipline is part of the product specification, not an afterthought, and it reduces the risk of a lot that assays correctly but behaves like a partially hydrolyzed material in the application.
Hydrolysis and Reactivity Documentation: The Certificate of Analysis reports assay, water content, chloride and appearance for the specific lot, allowing the buyer to assess hydrolysis risk and cure behaviour before the material enters a formulation. For coatings and sealants where pot life and cure speed are critical, lot-level moisture data is more informative than a nominal purity figure.
Application-Level Performance Support: XinChem’s technical team supports grade selection for water-repellent treatments, sealant cross-linking, silicone resin synthesis and sol–gel encapsulation, and advises on hydrolysis and condensation behaviour in the customer’s specific system so that the silane is matched to the substrate and cure conditions rather than selected on price alone.
Packaging and Logistics Flexibility
MTES is available in 200 kg drums and IBCs for industrial and construction volumes, in smaller sealed containers for pilot and specialty applications, and in moisture-protected packaging for high-purity and electronic grades. For Russia and EAEU destinations, XinChem arranges Class 3 flammable-liquid logistics with the required transport documentation, including Russian-language SDS and Certificate-of-Analysis support, to reduce clearance friction for a product that is imported rather than domestically produced at electronic-grade specification.
Application Support and Supply Reliability
XinChem’s technical team assists with grade selection for construction water repellents, sealants, silicone resins, anti-corrosion coatings and electronic encapsulants, and with the water, chloride and reactivity documentation that high-purity and electronic-grade qualification demands. Supply schedules accommodate both qualification quantities and recurring contract volumes, with stock held for the grades and package sizes most commonly requested in coatings, construction and electronics supply chains.
Why Choose XinChem
Expertise: Deep experience in organofunctional silanes and silicone intermediates, with application knowledge spanning construction chemicals, coatings, silicone resins and electronic materials.
Consistency: Control of assay, water and chloride—the parameters that determine whether MTES hydrolyzes and bonds as intended, or becomes a gelation and adhesion problem in the customer’s process.
Compliance Readiness: Documentation structured around UN 1993 Class 3 transport requirements, TSCA and REACH obligations, and grade-specific purity specifications, with Russian-language SDS support.
Responsiveness: Direct technical and commercial access, with order structures from qualification quantities to contract volumes.
Contact us now to discuss your methyltriethoxysilane requirements and request a specification sheet or qualification sample.
Website: www.xinchem.com
Email: sales1@xinchem.com
WhatsApp: +86 18049800532
Post time: Oct-28-2026