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+86 181 7149 4083
Product Description
Silane Coupler G-550 (also known as 3-Aminopropyltriethoxysilane / γ-Aminopropyltriethoxysilane, APTES, CAS 919-30-2) is a colorless to pale-yellow transparent low-viscosity liquid with a characteristic amine odor. As a bifunctional amino-silane coupling agent, it carries a reactive primary amine group (–NH₂) on one end and three hydrolyzable ethoxy groups (–OC₂H₅) on the silicon atom, acting as a “molecular bridge” between organic polymer matrices and inorganic substrates. It delivers excellent adhesion promotion, filler dispersion, interfacial reinforcement and moisture resistance. Widely used as a coupling agent, adhesion promoter, surface primer and reactive modifier in fiber-reinforced composites, adhesives, sealants, coatings, foundry resins, electronics and advanced materials.
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Introduction
Technical Grade (GC Purity ≥97.0%)
Standard Grade (GC Purity ≥98.0%)
High Purity Grade (GC Purity ≥99.0%, for electronics, optics & biomedical use)
Pre-hydrolyzed Aqueous Solution (pH-adjusted, stabilized for fiber sizing & primer use)
200kg steel or plastic drum
1000kg IBC tote
Dual reactivity: primary amine bonds to polymers; ethoxy groups condense with surface hydroxyls
Acts as coupling agent and latent epoxy-cure accelerator at the interface
Markedly improves wet/dry mechanical strength and electrical insulation properties
Enhances filler dispersion, reduces viscosity and improves processability of compounds
Forms stable aqueous sizing baths at pH 3–5 (acidified) or alkaline hydrolysates at pH 9–11
Excellent compatibility with epoxy, phenolic, polyester, PU, PA and silicone systems
Moisture-sensitive; hydrolyzes to silanols with ethanol release under humid conditions
Composites & FRP | Adhesives & Sealants | Coatings & Inks | Foundry & Abrasives | Plastics & Filled Compounds | Electronics & Encapsulation | Silicone & Textile Chemicals | Energy & Battery Materials
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We offer comprehensive services including product customization, flexible packaging, sample support, professional QC testing, on-time delivery, and after-sales technical guidance to ensure your satisfaction.
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We will take the transaction date as the starting point and make every effort to arrange shipment as quickly as possible. The specific shipping time will depend on product inventory and production schedules, and we will keep in close communication with you throughout the process to ensure you are always informed of the logistics progress.
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We accept both USD and RMB, making it convenient for you to choose the most suitable settlement method.
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We support a "sample first, payment later" approach. You may obtain samples for testing first and only make the payment after confirming that the samples meet your requirements. In addition, we can provide product testing reports upon your request, and take photos or videos during the shipping process, giving you complete peace of mind.
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