Nanjing Chemical Material Corp.
Product Name: n-Octyltriethoxysilane
Chemical Formula: C14H32O3Si
CAS No.: 2943-75-1
Dangerous Grade: NO
n-Octyltriethoxysilane (CAS 2943-75-1) functions as a high-performance penetrating sealer rather than a mere surface coating. Its superior protective performance is based on its unique chemical reaction within the substrate:
Deep Penetration: Due to its low molecular weight and small molecular size, n-Octyltriethoxysilane can penetrate deep into the capillaries of porous materials such as concrete, brick, and masonry.
Chemical Reaction (Hydrolysis & Condensation): Once inside the pores, the silane reacts with moisture ($H_2O$) and the alkaline environment (especially in new concrete) to undergo a hydrolysis and condensation process.
Formation of Silicone Resin Network: This reaction produces hydroxy groups that bond chemically with the substrate and with each other, forming a stable, permanent silicone resin network (polysiloxane) within the pores.
Breathable Protection: The treated surface becomes highly hydrophobic (water-repellent). This invisible barrier effectively inhibits water absorption and chloride ion ingress while remaining breathable, allowing internal water vapor to escape without causing spalling or altering the substrate’s original appearance.
ITEMS | SPECIFICATION |
Appearance | Colorless transparent liquid |
Reactive index(n25D) | 1.4170±0.0050 |
Assay | 98% |
180kg/drum or 850kg/IBC drum
Store in a cool, dry place. Keep container closed when not in use
Concrete
Inorganic pigment
Solvent
To help you choose the right solution for your specific industry, we have summarized the key applications of n-Octyltriethoxysilane (CAS 2943-75-1) and its functional benefits:
| Application Field | Primary Function | Technical Benefits |
| Concrete & Masonry Protection | Deep Penetrating Water Repellent | Provides long-lasting protection for bridges, highways, and building facades by creating an invisible hydrophobic barrier that resists freeze-thaw cycles and chloride ingress. |
| Inorganic Pigment Treatment | Surface Modifier & Dispersant | Enhances the dispersion of inorganic pigments (such as Titanium Dioxide - TiO2) in coatings and plastics, improving color stability and reducing formulation viscosity. |
| Filler Modification | Coupling Agent / Compatibility Linker | Improves the bonding and compatibility between mineral fillers (like talc, silica, or alumina) and polyolefins or non-polar matrices, increasing the mechanical strength of composites. |
| Solvent-Based Formulations | Active Ingredient | Ideal for formulating high-performance water-repellent products when diluted with organic solvents (like alcohols or hydrocarbons). |
Why Choose NCMC's n-Octyltriethoxysilane?
For global buyers seeking a reliable n-Octyltriethoxysilane supplier, our product offers distinctive advantages that ensure project success:
98% High Assay: Minimizes impurities, ensuring maximum reactivity and consistent hydrophobic performance across various substrates.
Superior Penetration Depth: Its optimized molecular structure allows for deeper absorption into cementitious materials compared to standard siloxane coatings.
Breathable Barrier: Unlike surface films, it does not trap moisture inside the concrete, preventing internal structural damage (spalling) while keeping the surface dry.
Global Supply Stability: As a leading manufacturer in China, NCMC provides consistent quality, competitive pricing, and technical support for large-scale industrial projects.
CG-N823 Silane is proudly supplied by NCMC, a trusted nOctyltriethoxysilane supplier with consistent quality and reliable delivery worldwide. Whendiluted with an appropriate solvent, it can be used in the formulation of water repellent products. Upon proper application, the formulated product will penetrate and provide water repellency by chemically reacting with the cementitious substrate. Treated substrates are hydro-phobic and retain their original appearance. CG-N823 Silane can also be used to improve the compatibility of mineral fillers or pigments in polyolefins or to ease their dispersion in nonpolar matrices.
CG-N823 Silane is a small molecule to allow for deep penetration into the cementitious surface. This material reacts with moisture in the air and n the substrate in the presence of an alkaline or acidic environment to produce hydroxy groups. These hydroxy groups will bond with the substrate and tself to produce a hydrophobic treatment that inhibits water absorption into the substrate. An alkaline environment, such as new concrete, will catalyze the reaction and speed the formation of the hydrophobic surface.
n-Octyltriethoxysilane is a high-purity silane used primarily as a water repellent (hydrophobic agent) for concrete and masonry. It is also an effective surface modifier and dispersing agent for inorganic pigments (like Titanium Dioxide) and mineral fillers used in plastics and coatings to improve compatibility and reduce viscosity.
It functions as a penetrating sealer. The small molecular structure allows it to reach deep into the pores of the substrate, where it reacts with the hydroxyl groups in the cementitious material. This reaction forms a stable, chemically bonded siloxane network that drastically reduces water and chloride ion penetration while maintaining the substrate's breathability.
Yes. Triethoxycaprylylsilane is the INCI (International Nomenclature Cosmetic Ingredient) name for n-Octyltriethoxysilane. While the construction industry refers to it by its chemical name for water repellency, the personal care industry uses it as a surface treatment for pigments in sunscreens and mineral makeup.
High-purity (98% min) silane ensures maximum reactivity and efficiency. It provides superior alkali resistance, prevents efflorescence (white salt staining), and protects structures against freeze-thaw damage and rebar corrosion without changing the original color or texture of the surface.
For optimal results, it can be applied undiluted or diluted with an appropriate solvent (like ethanol or isopropanol). It should be applied to a clean, dry surface using a low-pressure sprayer, brush, or roller until the substrate is saturated. An alkaline environment, such as new concrete, actually helps catalyze the reaction.
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