MESIL ME-171 — γ-Aminopropyltriethoxysilane Silane Coupling Agent (KH-550 / A-1100 Equivalent)
MESIL ME-171 is a primary amino-functional triethoxysilane coupling agent (CAS 919-30-2), equivalent to the widely specified KH-550 (China) and Momentive A-1100 (international) designations. With purity ≥98.0% by GC, ME-171 provides the bifunctional bridge between inorganic substrates (glass, silica, calcium carbonate, talc, wollastonite, aluminum, steel) and organic polymer matrices (epoxy, polyurethane, polyamide, phenolic) that silane coupling agents are used for.
The primary amine group (-NH₂) in ME-171 is reactive toward epoxy resins (ring-opening), isocyanates (urethane formation), anhydrides, carboxylic acids, and aldehydes, making this silane exceptionally versatile for composite and adhesive formulations. The three ethoxy groups hydrolyze in the presence of moisture to form silanols that condense with hydroxyl groups on inorganic surfaces, creating durable covalent bonds.
Technical Specifications
| Property | Value |
|---|---|
| CAS number | 919-30-2 |
| Chemical name | 3-Aminopropyltriethoxysilane |
| Molecular formula | H₂N(CH₂)₃Si(OC₂H₅)₃ |
| Molecular weight | 221.37 g/mol |
| Purity (GC) | ≥98.0% |
| Appearance | Colorless to pale yellow liquid |
| Refractive index (n²⁰D) | 1.420–1.425 |
| Density at 25°C | 0.940–0.950 g/cm³ |
| Flash point | ≥65°C |
| Boiling point | 217°C at 760 mmHg |
Application Suggestions
Glass Fiber Sizing (GF-Reinforced Nylon and Epoxy Composites)
ME-171 is one of the two most widely used silanes in glass fiber sizing formulations (alongside ME-151, γ-methacryloxypropyltrimethoxysilane). In GF-reinforced nylon (PA6, PA66), the primary amine reacts with the amide groups along the polymer backbone and with terminal carboxylic acid groups, generating strong interfacial bonds that translate directly into higher flexural strength, impact resistance, and wet retention of mechanical properties in the composite. In GF/epoxy composites, the amine is directly reactive with the epoxy resin, forming a covalently bonded interphase.
Mineral Filler Treatment (CaCO3, Talc, Wollastonite in PP/PA)
Surface treatment of mineral fillers (calcium carbonate, talc, wollastonite, kaolin) with ME-171 prior to compounding into polypropylene or polyamide matrices reduces filler-polymer interfacial energy, improves filler dispersion, and enhances composite mechanical properties — particularly notched impact strength and tensile elongation. ME-171 is typically applied at 0.5–2.0 Wt% on filler weight, either by dry blending or from dilute aqueous solution.
Adhesion Promoter (Epoxy and PU Coatings on Glass, Aluminum, and Steel)
ME-171 is used as an adhesion promoter additive (0.1–1.0 Wt% in the formulation) in epoxy and polyurethane coatings, adhesives, and sealants bonded to glass, aluminum, and steel substrates. The silane primer forms a molecular-level bond at the inorganic surface, dramatically improving coating adhesion, cross-cut adhesion (GT 0), and resistance to cathodic delamination in corrosive environments. Can be applied as a dilute aqueous primer (1–2% in water) or incorporated directly into the formulation.
Foundry Sand Binder Crosslinking
In furan and phenolic resin-bonded foundry sand systems, ME-171 is used as a coupling agent/adhesion promoter between the silica sand grain and the organic binder resin, improving mold and core strength, reducing resin demand, and improving hot strength retention. Typical use level is 0.1–0.3 Wt% on resin weight.
Technical Support & FAQ: MESIL ME-171
+Q1: What are the key features of ME-171 versus other amino silane grades?
ME-171 has a primary amine (-NH₂), making it more reactive toward epoxy and isocyanate groups than secondary or tertiary amino silanes. Its three ethoxy groups (versus methoxy in KH-550 methoxy variants) produce ethanol as the hydrolysis byproduct — preferred in food-contact adjacent or low-VOC applications. Purity ≥98.0% minimizes color impact in light-colored or clear coating and adhesive formulations.
+Q2: How does ME-171 compare to Momentive A-1100 (KH-550)?
ME-171 (CAS 919-30-2, 3-aminopropyltriethoxysilane) is chemically identical to Momentive A-1100 and equivalent to domestic KH-550 ethoxy grades. SEMITECH provides full CoA with GC purity ≥98.0%, refractive index, density, and appearance data for each batch. Pricing is significantly below Momentive list pricing, with equivalent performance in glass fiber, composite, and adhesive applications.
+Q3: What factors affect pricing?
ME-171 pricing follows global silane monomer feedstock prices. Volume (200 kg drum vs. 1000 kg IBC tote pricing) is the primary lever, with IBC pricing typically 8–12% below drum pricing per kg. Contact info@semitechnm.com for a current FOB Shanghai quotation.
+Q4: What are lead times and payment terms?
Standard lead time is 7–14 days from order confirmation for stocked grades. Payment terms: T/T, L/C, D/P. Free samples of 200g–1kg are available for application testing on request.
Packing & Storage Information
200 kg Iron Drums Standard packing for ME-171 is 200 kg net in sealed iron drums with nitrogen blanket. FCL capacity approximately 16–18 MT (80–90 drums).
1000 kg IBC Totes Available for high-volume consumers. IBC totes are cost-effective for large composite and glass fiber manufacturers with bulk silane handling capability.
Storage Conditions Store in a cool, dry, well-ventilated area away from moisture, heat sources, and strong oxidizing agents. ME-171 is moisture-sensitive — hydrolyzes on contact with water, forming silanols and ethanol. Keep tightly sealed. Flash point ≥65°C; store away from open flame. Shelf life: 12 months in original sealed containers under recommended storage conditions.