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Tetraethyl Orthosilicate

    • Product Name Tetraethyl Orthosilicate
    • Alias TEOS
    • Einecs 203-852-6
    • Mininmum Order 1 g
    • Factory Site Tengfei Creation Center,55 Jiangjun Avenue, Jiangning District,Nanjing
    • Price Inquiry admin@sinochem-nanjing.com
    • Manufacturer Sinochem Nanjing Corporation
    • CONTACT NOW
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    Specifications

    HS Code

    629076

    chemical_name Tetraethyl orthosilicate
    chemical_formula Si(OC2H5)4
    molecular_weight 208.33 g/mol
    appearance Colorless liquid
    density 0.933 g/cm3 (20°C)
    melting_point -77°C
    boiling_point 168.1°C
    solubility_in_water Decomposes
    refractive_index 1.383 (20°C)
    flash_point 46°C (closed cup)
    vapor_pressure 1 hPa (20°C)
    autoignition_temperature 220°C
    cas_number 78-10-4

    As an accredited Tetraethyl Orthosilicate factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.

    Packing & Storage
    Packing Tetraethyl Orthosilicate is packaged in a blue 200-liter steel drum, clearly labeled with hazard warnings, product name, and batch number.
    Shipping Tetraethyl Orthosilicate should be shipped in tightly sealed containers, clearly labeled, and protected from moisture and ignition sources. It must be handled as a flammable liquid, complying with applicable regulations (UN 1292, Class 3). Proper ventilation, secondary containment, and use of appropriate protective equipment are essential during storage and transportation.
    Storage Tetraethyl orthosilicate should be stored in a cool, dry, well-ventilated area away from heat, ignition sources, and incompatible materials such as strong acids and bases. Keep the container tightly closed and properly labeled. Use only approved containers made of materials compatible with the chemical. Protect from moisture, as it hydrolyzes readily, releasing ethanol and forming silicic acid.
    Application of Tetraethyl Orthosilicate

    Applications of Tetraethyl Orthosilicate in Industrial Manufacturing

    As a direct chemical manufacturer, we supply Tetraethyl Orthosilicate (TEOS) to downstream partners operating in industries where its high purity and reactivity are required for advanced processing. Below, we present primary industrial use cases, each reflecting the specific compliance standards, formulation ratios, production processes, and end products relevant to global B2B buyers.

    1. Sol-Gel Precursors for Electronic and Optical Coatings

    Tetraethyl Orthosilicate plays a critical role in sol-gel technology for fabricating dense and uniform oxide films used on electronic displays, optical lenses, and semiconductor components. Manufacturers rely on precise hydrolysis and condensation steps to deposit thin silica layers, achieving dielectric, anti-reflective, or protective properties according to device requirements. Critical attention is given to particle size control, film homogeneity, and contaminant levels to meet strict performance and regulatory benchmarks needed for microelectronics manufacturing.

    Industry compliance standards

    • IEC 61249-2-41 for electronics substrate materials
    • RoHS Directive (2011/65/EU) for hazardous substance restriction
    • SEMI Standards (especially C41 for electronic-grade chemicals)
    • ISO 9001:2015 quality management systems

    Typical usage ratio

    • 5–30 wt% in silicate precursor solution, based on film thickness and final device requirement; adjusted for hydrolysis rate and desired refractive index

    Downstream process integration

    • Batchwise dosing during preparation of sol-gel solutions; hydrolysis and condensation reactions occur under controlled humidity and catalysis; silica network evolution occurs atop glass, silicon, or polymer substrates via dip-coating, spin-coating, or spray-coating steps

    Final product types

    • Touch panel and display glass
    • Anti-reflective and scratch-resistant optical coatings
    • Passivation and dielectric films on printed circuit boards
    • Photonic and sensor device substrates

    2. Crosslinker in Silicone Rubber and Sealant Manufacturing

    Rubber formulators utilize TEOS as a crosslinking agent for condensation-curing silicones, which are employed in structural glazing, automotive sealing, and electronics encapsulation. Selection of crosslink ratio influences the mechanical properties, elongation, and adhesive strength of the cured silicone elastomer, while precise addition prevents excess volatile byproducts that can compromise long-term stability. The raw material must comply with sector-specific safety and durability regulations governing construction and transportation industries.

    Industry compliance standards

    • ASTM C1184 for structural silicone sealants
    • ISO 11600 for building joint sealants
    • REACH Regulation (EC) No 1907/2006 for chemical safety
    • UL 94 for flammability of polymeric materials

    Typical usage ratio

    • 0.5–3.0 parts per hundred resin (phr) in one- or two-part silicone formulations; tailored to polymer chain length and curing conditions

    Downstream process integration

    • Metered addition into silicone base compound with selective catalysts and fillers; TEOS reacts during moisture exposure or in the presence of tin/zinc catalysts to develop three-dimensional crosslinks, resulting in elastic and adhesive cured products

    Final product types

    • Architectural glazing sealants
    • Automotive windshield and assembly gaskets
    • Electronics potting gels
    • Acid-cure and alkoxy-cure construction sealants

    3. Binder in Investment Casting for Aerospace and Precision Engineering

    Precision foundries apply TEOS in binder formulations for investment casting shell molds, particularly where consistent shell strength and high-temperature stability are needed for turbine blades, medical implants, or engineering components. The concentration of TEOS influences slurry viscosity, shell settling, and silica network formation, all of which dictate the dimensional accuracy and surface finish of the final cast. Quality assurance systems focus on minimizing volatiles and ash content, and raw material traceability must match major AS and ISO standards.

    Industry compliance standards

    • AS9100 for aerospace quality management
    • AMS 4990 for casting processes
    • ISO 12680-1 for refractory investment casting materials
    • NADCAP accreditation for special processes

    Typical usage ratio

    • 10–20 wt% of binder solution, dependent on slurry solids loading and shell layering requirements; formulation adjusted according to part geometry and pour metal temperature

    Downstream process integration

    • Blended into colloidal silica slurries for primary and backup coat binders; controlled hydrolysis produces flexible green shells, which are further reinforced and fired to obtain dense, thermally stable ceramic molds prior to casting molten alloys

    Final product types

    • Aero-engine turbine blades and vanes
    • Orthopedic and dental implant castings
    • Value-added hardware and instrument housings
    • Precision hydraulic fittings

    4. Source Material for Synthetic Zeolite and Catalyst Production

    Catalyst manufacturers and chemical processors leverage TEOS as a controlled silicon source for synthesizing zeolites and silica-alumina catalysts. Accurate dosing ensures the correct Si/Al ratio and crystallinity of the zeolite framework, which governs adsorption, ion-exchange, and catalytic performance in oil refining and gas purification. Processing takes place under strict plant safety and emissions controls to meet environmental and chemical purity requirements for industrial-scale catalyst production.

    Industry compliance standards

    • API 932 for catalytic materials used in oil refining
    • ISO 9001:2015 for quality management
    • EN 12902 for treatment chemicals in water processing
    • EU CLP (EC No 1272/2008) for safe handling and classification

    Typical usage ratio

    • Adjustable from 12–30 mol% as the primary silica source in hydrothermal batch syntheses; Si:Al ratio selected according to targeted zeolite type (ZSM-5, Y, beta, etc.)

    Downstream process integration

    • Fed to high-shear reactors with alkali and structure-directing agents for controlled hydrothermal crystallization; precursor gels aged and processed at elevated temperature, then filtered, ion-exchanged, and calcined to achieve final catalyst structure

    Final product types

    • Catalytic zeolites for FCC (fluid catalytic cracking)
    • Hydrocracking and isomerization catalyst carriers
    • Molecular sieve products for desiccants and purification
    • Silica-alumina catalyst supports

    5. Silica Matrix Formation for Encapsulation of LEDs and Photovoltaics

    Manufacturers in solid-state lighting and photovoltaic segments incorporate TEOS for creating protective silica matrices around sensitive devices during encapsulation. This approach provides controlled diffusion barriers, UV stability, and electrical insulation for LED chips and solar cell junctions. Selection of additive amount and reaction conditions defines encapsulant transparency, hardness, and adhesion for maximizing efficiency and service life of the final device under varied environmental exposures.

    Industry compliance standards

    • IEC 61215 for photovoltaic module reliability
    • IEC 60838 for LED lamp component safety
    • UL 746C for polymeric materials in electrical equipment
    • ISO 14001 for environmental management

    Typical usage ratio

    • Up to 25 wt% in sol-gel encapsulation matrices for optoelectronic device embedding, with further adjustment based on refractive index and rigidity requirements

    Downstream process integration

    • Accurate dosing into resin or sol-gel prepolymer mixtures; hydrolysis and condensation proceed to yield in situ silica loading, followed by casting and curing around LED or solar cell arrays, with subsequent quality checks for optical and electrical performance

    Final product types

    • Encapsulated high-power LED chips
    • Photovoltaic panel edge sealants
    • Surface-mount diode assemblies
    • Protective overcoats for thin-film solar modules

    6. Controlled Silica Source for Chromatography Packing Materials

    TEOS serves as a feedstock in the production of high-purity silica spheres that function as stationary phases in analytical and preparative chromatography columns, such as HPLC and GC. The control of precursor ratio, hydrolysis rate, and condensation environment during manufacturing affects particle uniformity, pore size, and surface chemistry of the stationary phase, directly impacting column resolution and reproducibility for pharmaceutical, environmental, and food testing laboratories worldwide.

    Industry compliance standards

    • USP <621> for chromatography standards
    • ISO 17025 for testing laboratory accreditation
    • ICH Q3D for elemental impurities in pharmaceuticals
    • FDA 21 CFR 211 for current Good Manufacturing Practice (CGMP)

    Typical usage ratio

    • Formulations range from 15–40 mol% in silica sol with adjustment based on desired pore diameter (e.g., 60–300 Å) and particle morphology for specific column applications

    Downstream process integration

    • Continuous hydrolysis and polycondensation in reactors followed by precipitation, washing, silylation (where required), spray drying, and final particle size classification before quality certification and packing

    Final product types

    • HPLC and GC column packing materials
    • Solid-phase extraction (SPE) cartridges
    • Ion chromatography supports
    • Analytical grade pre-packed columns for laboratory and process-scale separations
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    Certification & Compliance
    More Introduction

    Tetraethyl Orthosilicate: Confidence Grown from Experience in Precision Chemistry

    Real Value Begins with the Raw Material

    We see Tetraethyl Orthosilicate not just as a colorless volatile liquid, but as an enduring tool in modern industry. Our plant’s output consistently meets high purity standards—over 99.9% on most batches. Achieving this comes from decades of process refinement: no shortcuts, no glossing over minor variables. We measure moisture, alcohol content, and trace metals batch by batch. Direct control means we understand what actually ends up in our drums. This attention makes all the difference once the product hits your tanks, leading to fewer surprises and less downtime for routine adjustments.

    Model Variants and Specifications Shaped by Feedback

    Over years of scale-up and collaboration with coatings, foundry, and electronics customers, we tailored our Tetraethyl Orthosilicate offerings. Many want the TEOS-Standard grade with less than 500 ppm water and under 20 ppm impurity content—directly supporting high-clarity glass and defect-free sol-gel applications. Some downstream users, especially in high-end semiconductors and precision glassware, specify TEOS-Ultra, where trace metallics register below detection levels using ICP-MS. There is no mystery list; every specification evolves from repeated feedback from real-world users—engineers, formulators, and plant managers. This isn’t a catalogue claim, it’s a lived truth. Our material’s density ranges between 0.930–0.940 g/cm³ at 25°C, with boiling point close to 168°C, figures verified in every delivery lot.

    Process Depends on Purity, Not Promises

    Synthetic routes matter. Ethanol-orthosilicate exchange, one of the standard pathways, can produce inconsistent fractions if quality controls slip. With on-site, real-time gas chromatography, we catch ethanol or diethyl contaminants early. This lets our clients—especially those fabricating optical or technical ceramics—trust that our product integrates seamlessly into their process, without haze, microbubbles, or unexplained reactivity. We have found over the years that purity isn’t just about exceeding a number on a certificate. It’s the difference between scrap and saleable yield, or between equipment fouling and clean operation.

    Applications Defined by Real-World Demands

    End-uses for our Tetraethyl Orthosilicate span many sectors. In foundries, it’s a proven hardening agent for silica sand cores and molds. Foundry engineers often comment that binder reactivity directly tracks residual moisture, not marketing lines. We keep our moisture content low, supporting consistent setting times and mold integrity, batch after batch. The sol-gel sector presents other demands. Lab managers count on exact hydrolysis rates and reproducible particle morphology, so trace residual acid and base contaminants must remain controlled—differences that arise from process discipline. In optical fiber drawing, every supplier claims their product is “high-purity,” but only repeated shipment histories demonstrate which batches really perform, free from micro-defects.

    In silicones manufacturing, this chemical becomes a reliable crosslinker. Downtime from gel formation or erratic batch viscosity signals upstream variance. We learned from thousands of metric tons delivered that only close process monitoring prevents unexpected polymer behavior. Aerospace coatings, glass enamels, and zeolite syntheses all benefit from that foundation—starting material integrity feeds through the entire value chain, raising the ceiling on finished product quality.

    Direct Control, Continuous Improvement

    Unlike traders or bulk handlers, we operate every reactor and distillation stage, ensuring no cross-line or contamination histories. Handling the entire manufacturing chain lets us act on anomalies directly—adjusting distillation rates, updating filtration cycles, or resolving solvent residue before drums get filled. Site operators bring up issues quickly, from pump seal leaks to column performance drift, preventing small defects from scaling into larger problems.

    This tight feedback loop means our technical service team doesn’t guess at root causes—they recognize them, having troubleshot similar hiccups on the floor. Our customer base, comprised of long-term partners in specialties like silica aerogels and LCD glass, has shaped everything from improved batch tracking to custom packaging solutions. That push and pull—what works in daily operations, not just in spec sheets—drives better product at lower overall risk.

    Differences Rooted in Manufacturing Transparency

    We get calls about “equivalent” Tetraethyl Orthosilicate more often than we can count. Many think all colorless liquids labeled TEOS are interchangeable; lived experience says otherwise. Material processed through multi-purpose lines, with solvent or by-product residue, brings irregular reactivity or yellowing nobody wants to troubleshoot downstream. In some markets, certain resellers repackage or relabel blended product, chasing price points rather than process consistency. We do not chase short-term gains at the cost of reliability. No external brokers or untraceable blends enter our chain—every lot remains assigned to our manufacturing and storage facilities.

    The difference shows up over time. One customer reported their previous supplier’s drums arrived with sediment or haze near the bottom, fouling their dosing equipment and introducing weeks of rework. Our direct shipping history showed zero nonconformance in parallel trials. Another coatings firm needed tighter trace alkali levels to avoid haze in clear architectural glass; after several unsuccessful trails with generic TEOS, only our low-alkali option passed acceptance testing.

    Supporting Claims with Data, Not Hearsay

    Every delivery comes with batch-specific GC and ICP-MS analysis—far beyond just a printed COA. Over the past year, our return rate due to product nonperformance sat below 0.3%, on a shipped volume exceeding 10,000 tons. Most of these issues related to improper storage or cross-contamination at destination, not anything inherent to our process. More than technical specs, shipment traceability reassures procurement managers and engineers, who see full transparency from raw silica sourcing through final drum closure.

    Laboratory support doesn’t stop with printed data. For a few high-volume electronics customers, we keep retained samples for up to three years, allowing them to audit and align past runs if unexpected behaviors arise during large-scale fabrication. Seasoned chemists at our facility respond with actual archived samples and chromatographs rather than generic answers. Mid-sized users in ceramics report fewer interruptions, since our technical team has the background to recommend adjustment recipes and mitigation steps grounded in decades of silica chemistry.

    Sustainability Considerations and Waste Reduction

    We notice increasing demand for environmental transparency—specifically, effluent handling and energy usage during hydrolysis or distillation. Over several cycles of investment, we installed solvent recovery to reuse nearly all ethanol by-product, slashing volatile organic output. Closed-loop scrubbers trap trace silicon and minimize atmospheric loss, resulting in actual, measurable reductions in air and wastewater emissions. Our internal waste benchmarks improved by 25% just over the past three years, measured in kilograms of silicon discharged per ton shipped.

    For specialty users focused on minimizing environmental impact, we offer custom refill programs and reusable IBCs, preventing drum waste at the customer site. These changes stem from field conversations—clients taught us where their pain points lay, and together we mapped practical, stepwise changes. This led to meaningful reductions in single-use plastics and drum packaging at several large construction chemical and glass fabrication partners.

    Enduring Partnerships Drive Long-Term Improvement

    Trust doesn’t develop from brochures. It comes from repeated deliveries, regular analysis, and straightforward responses when issues arise. We welcome audits and on-site qualification visits; it’s the only way customers truly see which controls stand behind the product. Many procurement teams started out using reference samples for pilot-scale runs. After tracking real-world process behavior side by side, they transitioned to mainline supply contracts for annual volumes in the thousands of tons. That confidence comes not just from “meeting spec”—it results from handling every variable, from drum lining material to seasonal handling precautions.

    Some larger clients co-develop specialized grades with us. The coatings sector targets deeper clarity, the aerogel market wants lower impurity levels, and the fiber-optic industry prioritizes batch-to-batch consistency above all. We work alongside their engineers, even co-hosting low-dose addition trials or pilot line runs. Feedback cycles run both ways—when field techs highlight an adjustment that speeds mixing or reduces waste, we integrate those steps into our own process guidebook. All practical improvements flow back into mainline production.

    Potential Solutions for Known Challenges

    Over time, certain industry-wide problems persist—storage degradation, drum contamination, and mid-transport temperature swings. For long-haul and international users, we developed insulated and lined drum options with active desiccant controls, keeping material fresh even during weeks at sea. We found that pre-drying tank truck lines and adopting inerting protocols curbed peroxide formation and preserved material clarity, eliminating previously frequent claims of yellowing or unexpected gelation.

    Handling is a persistent sticking point. In-house logistics teams document every transfer step, from reactor to finished drum, eliminating confusion caused by third-party handlers. We developed an in-plant checklist for bulk users, reducing on-site contamination events during drum changeovers. One major buyer fed that information back to their own receiving team, which led to smoother handoffs across two continents. Technical bulletins now cover lessons learned, from line purging to emergency cleanout after off-spec incident—a transfer of practical knowledge benefitting everyone down the chain.

    User Community Grows by Sharing Practical Knowledge

    No two customers approach Tetraethyl Orthosilicate precisely the same way. Some batch sol-gel for antireflective coatings, others run continuous reactors for silica synthesis, and a third segment focuses purely on rapid mold hardening for advanced foundry work. What unites these users is a fundamental need for transparency—not just in paperwork, but in daily plant practice. Information about experience-based troubleshooting circulates among engineers, shared through site visits, technical webinars, and direct discussions with our staff. Everyone gains with each iteration, avoiding pitfalls newer entrants often rediscover the hard way.

    Peer-to-peer feedback informs product improvement more reliably than any internal brainstorming session. Consistency builds a resilient community, resisting market disruptions and shortcut temptations that often crop up with less invested suppliers. We learn most when projects do not run as planned—shipping delays, climate-induced storage breakdown, or unexpected minor impurity spikes. Instead of stepping back or minimizing such episodes, we step forward, identifying actionable solutions and preventing their recurrence.

    The Human Touch in Manufacturing Chemistry

    People—operators, engineers, quality inspectors—make the difference day in and day out. Automated controls play their part, but vigilance and field-driven correction safeguards every batch. Experience taught us that success in manufacturing reliable Tetraethyl Orthosilicate isn’t achieved by automation alone. Routine operator rounds catch patterns invisible to analytics software; decades of oversight feed judgment calls on process tweaks or filter replacements.

    Over the years, stories circulate through our ranks of challenging winters, unexpected supplier outages, or new process requirements. It’s the accumulated wisdom of each team member—many with decades on shift—that supports our reputation today. Practical, on-the-floor experience earned through years of troubleshooting underpins not just product quality but useful advice to clients attempting new product lines or scale-ups.

    Knowing hundreds of industrial customers by project, rather than just by purchase order, means we respond thoughtfully when issues arise. This approach built our core identity: honesty with process data, clear communication, and a stubborn refusal to compromise on quality, even if that means spending longer on a batch or pausing shipments to confirm specifications.

    Looking Forward: Tetraethyl Orthosilicate as a Foundation for Progress

    Demand for Tetraethyl Orthosilicate will not disappear. Processes become more complex, and the materials world keeps advancing—clearer glass, stronger optical fibers, lighter composites. Our goal remains simple: produce a starting material that lets innovators thrive without worrying about upstream variability. Listening, adapting, and refining our process shapes the real-world reliability behind every drum we ship.

    Whether you’re running a laboratory development batch, a foundry pilot, or full-scale production, genuine partnership and mutual respect drive better results than any checklist specification. Each container leaving our plant draws on the lived experience of an entire manufacturing team whose pride and methods align with your need for certainty. The importance of dependable Tetraethyl Orthosilicate isn’t theoretical—it shows in every glass pane, mold, or film that starts with a quality foundation, made by those who care about getting it right.