3-Aminopropyltriethoxysilane（APTES）

Properties and Reactivity：

3-Aminopropyltriethoxysilane（APTES） is a bifunctional silane containing reactive amino groups and hydrolysable ethoxysilyl groups. This dual functionality enables it to chemically bond inorganic materials such as glass, metals, and mineral fillers with organic polymers, including thermoplastics, thermosets, and elastomers. It is therefore widely used as an adhesion promoter, crosslinker, and surface modifier, helping improve adhesion, water resistance, and corrosion protection.

When exposed to water, ES-550 hydrolyzes to form reactive silanol groups that can bond with a wide range

 of inorganic surfaces, while its amino group can react with suitable organic polymers. Compatible substrates include glass, glass fiber, silica, mica, kaolin, talc, metal oxides, and metals. It can also be used with epoxy, polyurethane, polyamide, PVC, acrylic, silicone, and other resin systems.

Product Features：

Excellent Coupling Performance – Creates a strong chemical bridge between inorganic materials and organic polymers, improving interfacial adhesion.

Improved Mechanical Strength – Helps enhance tensile strength, flexural strength, impact resistance, and overall material durability.

Better Moisture & Corrosion Resistance – Improves resistance to moisture and corrosion, supporting longer service life.

Enhanced Filler Dispersion – Promotes better dispersion and higher loading of fillers in polymer systems while helping reduce formulation viscosity.

Wide Resin Compatibility – Suitable for epoxy, polyurethane, polyamide, PVC, acrylic, silicone, and other resin systems.

Versatile Surface Modification – Can be used as a coupling agent, adhesion promoter, crosslinker, or primer for glass, metals, mineral fillers, and other inorganic substrates.

Technical Data：

Quick Product Information：

Applications：

Adhesives & Sealants
3-Aminopropyltriethoxysilane is used as an adhesion promoter in epoxy, polyurethane, and other adhesive systems, helping improve bonding between organic resins and glass, metals, and mineral substrates.

Coatings & Surface Treatment
It is used in primers, protective coatings, and surface treatment formulations to improve adhesion to metal, glass, concrete, and other inorganic surfaces, supporting better durability and corrosion resistance.

Glass Fiber & Composites
APTES is widely used for glass fiber treatment and reinforced plastics. It improves the bond between glass fibers or mineral fillers and the polymer matrix, helping composites achieve better mechanical strength and long-term performance.

Mineral Fillers & Rubber
It can be used to modify silica, kaolin, talc, and other mineral fillers, improving their compatibility and dispersion in polymer and rubber systems.

Packaging and Storage：

APTES is moisture-sensitive, so proper sealing during storage and transportation is important. It is available in 20 kg / 25 kg containers, 180 kg drums, IBCs, and customized export packaging, depending on the order quantity and customer requirements.

Store APTES in a cool, dry, and well-ventilated area, tightly sealed and protected from moisture and incompatible materials. Once opened, reseal the container promptly and avoid unnecessary exposure to humid air, as moisture can cause hydrolysis. For larger-volume orders, proper storage and handling conditions are essential to maintain product stability.

Customers should review the latest Safety Data Sheet (SDS), toxicity data, and relevant information on the proper handling, storage, transportation, and use of the product before use. The expiry date is indicated on the product label. Storage beyond the date stated on the Certificate of Analysis does not necessarily mean that the product is unusable; however, the properties required for the intended application should be checked to confirm its quality and suitability.

Why Choose EastChem?

Choosing an APTES supplier is not only about getting a competitive price. For regular production, consistent quality, complete documentation, and reliable delivery can make a bigger difference.

Consistent Quality
Each shipment can be checked against the agreed product specification, helping ensure that the material you receive meets your production requirements.

Complete Documentation
COA, TDS, SDS, product specifications, batch information, and shipping documents can be provided for product evaluation and incoming inspection.

Packaging for Export
APTES packaging can be arranged according to your order quantity, transportation conditions, and destination market, with customized export packaging available when needed.

Practical Application Support
If you are testing APTES for a new formulation or are unsure about the suitable grade or dosage, the product team can discuss your resin, filler, and processing conditions with you before supply.

From Samples to Regular Supply
Samples can be arranged for initial testing, while larger-volume orders can be handled for ongoing production. The aim is simple: make it easier for you to evaluate the product first and move to regular supply when it meets your requirements.

FAQ：

1. Can APTES be customized for different applications?
Yes. The suitable specification can be discussed based on your resin, filler, substrate, purity requirements, and production process. Send us your application details, and our team can help evaluate the right specification.

2. What information should I provide when requesting an APTES quotation?
The required purity, estimated quantity, packaging preference, destination, and application are usually enough to start. Contact EastChem with your requirements, and we can provide a suitable product option and quotation.

3. Can EastChem support long-term APTES supply for industrial production?
Yes. Both samples for initial testing and regular bulk supply can be discussed. Product documentation, export packaging, and batch-related information can also be arranged according to your requirements. Send us your expected quantity and delivery destination to discuss a supply plan.