Coatsil 1770 KBE-303
Momentive ShinEtsu
2931900090
Siwin-EH232
10217-34-2
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2-(3,4-Epoxycyclohexyl)ethyltriethoxysilane, with the product designation Siwin-EH232 and CAS number 10217-34-2, is a cycloaliphatic epoxy-functional silane coupling agent designed for industrial resin formulations. This silane features a triethoxysilyl group that bonds to inorganic substrates and an epoxycyclohexyl group that reacts with organic polymers, serving as a molecular bridge across dissimilar material interfaces.
The cycloaliphatic epoxy structure distinguishes this product from glycidyl ether-based epoxy silanes. The six-membered ring configuration provides enhanced storage stability in polyurethane and epoxy systems, reducing premature viscosity buildup during formulation and shelf storage. Commercial procurement teams in glass fiber composites, foundry resins, and industrial coatings sectors select this silane when formulations require improved mechanical retention under humid conditions.
The following table presents the original physical properties data from the product specification sheet:
Parameter | Value |
Product No. | Siwin-EH232 |
Chemical Name | 2-(3,4-epoxycyclohexyl)ethyltriethoxysilane |
CAS NO. | 10217-34-2 |
EINECS NO. | 425-050-4 |
Formula | C14H28O4Si |
Molecular Weight | 288.46 g/mol |
Appearance | Colorless Transparent Liquid |
Density (ρ20°C, g/cm³) | 1.0650 ± 0.0050 |
Refractive Index (n 25°C) | 1.4410 ± 0.0050 |
Purity (by GC, %) | ≥ 98% |
Boiling Point | 114-117 °C |
HS Code | 2931900090 |
Chemical Structure |  |
Purity verification is conducted via gas chromatography with a minimum threshold of 98 percent. Density and refractive index measurements follow standardized laboratory protocols at specified temperatures, with published tolerance ranges reflecting batch-to-batch consistency.
The molecular structure of 2-(3,4-epoxycyclohexyl)ethyltriethoxysilane consists of a central silicon atom bonded to three ethoxy groups and an ethyl chain terminated by an epoxycyclohexyl ring. The formula C14H28O4Si corresponds to a molecular weight of 288.46 grams per mole.
The triethoxysilyl moiety undergoes hydrolysis in the presence of moisture or catalytic conditions, generating silanol groups that form covalent bonds with hydroxyl-rich inorganic surfaces including glass, silica, minerals, and metal oxides. Subsequent condensation reactions build a siloxane network at the interface.
The cycloaliphatic epoxy group participates in ring-opening reactions with amine, carboxyl, and anhydride functional groups present in epoxy resins, polyurethane dispersions, and acrylic polymers. Unlike glycidyl epoxy silanes, the aliphatic ring structure imparts lower steric hindrance in certain crosslinking scenarios and demonstrates reduced yellowing under UV exposure compared to aromatic epoxy alternatives.
In fiberglass-reinforced polymer systems, this epoxy silane functions as a size ingredient or finish coating on glass fiber surfaces. Treated fibers exhibit improved interfacial bonding with epoxy and polyurethane matrices, translating to measurable gains in flexural strength, tensile strength, and modulus of elasticity. Composite manufacturers report that silane-treated laminates retain a higher percentage of their dry-state mechanical properties after accelerated humidity aging.
Foundry operations incorporate this silane into polyurethane no-bake and cold-box resin binders. The additive enhances binder adhesion to silica sand grains, improving tensile and transverse strength of sand cores and molds. Foundries using the additive observe reduced scrap rates from core breakage and improved surface finish on cast metal parts.
Sealant and adhesive producers use the product as either a primer or an in-formulation additive. In polyurethane sealants, the cycloaliphatic epoxy structure delivers extended shelf life compared to aminosilane alternatives, which tend to accelerate viscosity drift during storage. The silane improves adhesion to glass, aluminum, and concrete substrates in both single-component and two-component systems.
For mineral-filled polymer composites, the silane serves as a filler pretreatment agent or direct additive. Treating calcium carbonate, talc, wollastonite, and silica fillers with the silane improves dispersion and interfacial adhesion, raising composite mechanical properties and reducing moisture uptake.
In industrial coating formulations, the silane functions as both an additive and a primer component. Coatings incorporating the silane demonstrate improved adhesion to metallic and mineral substrates, along with enhanced resistance to cathodic delamination and moisture penetration. The product also finds use in epoxy-based encapsulants and packaging materials for electronic components, where it improves wet electrical properties including volume resistivity and dielectric constant stability.
The following equivalent product cross-reference table is preserved from the original product documentation without modification:
Momentive | Dowcorning | ShinEtsu | Evonik | Wacker |
|---|---|---|---|---|
CoatSil1770 | N.A | KBE-303 | N.A | N.A |
Industrial clients formulating with the referenced commercial grades can substitute Siwin-EH232 at equivalent loading levels. Batch-to-batch consistency is maintained through GC purity verification and physical property testing against the published specification ranges.
The product is available in two standard packaging formats for business operations:
210L Iron Drum: 200 kg net weight per drum
1000L IBC Container: 1000 kg net weight per container
Custom packaging arrangements can be discussed for enterprise customers with specific volume or logistics requirements.
For maximum shelf stability, store the product in a cool, dry location away from direct sunlight and sources of moisture. Sealed containers maintain specification compliance for a minimum of 12 months from the date of manufacture when stored under recommended conditions. The triethoxysilyl group is moisture-sensitive; partial containers should be purged with dry nitrogen and resealed promptly after use.
Typical addition rates range from 0.3 percent to 1.0 percent by weight of the total size formulation, depending on fiber diameter, resin system, and desired property profile. Formulators typically conduct titration studies to determine the optimal loading for their specific application.
The cycloaliphatic epoxy structure generally provides longer pot life and better storage stability in polyurethane formulations compared to glycidoxypropyl trimethoxysilane. The aliphatic ring also contributes to lower yellowing in outdoor exposure scenarios.
Minimum order quantities vary by packaging format. Drum-level orders are typically available for sample evaluation and small-batch production. Full container load (FCL) arrangements apply for volume shipments. Enterprise customers with ongoing requirements may establish scheduled delivery programs.
Yes, the product is compatible with waterborne epoxy and polyurethane dispersions when properly formulated. The ethoxy groups hydrolyze under aqueous conditions, and the epoxy functionality remains available for crosslinking during film formation. Formulators should adjust pH and add time to manage hydrolysis kinetics.
Each shipment includes a Certificate of Analysis confirming conformance to the published specification for purity, density, refractive index, and appearance. GC chromatograms and additional test data can be provided upon request for enterprise customers with incoming quality verification programs.
