(3-Glycidyloxypropyl)trimethoxysilane (GPTMS) ≥98% CAS No.: 2530-83-8
SIOResin® H-1671 3-Glycidyloxypropyltrimethoxysilane (GPTMS) CAS No.: 919-30-2 is a versatile organosilane coupling agent designed to improve adhesion between organic polymers and inorganic materials. Its epoxy-functional group reacts readily with a wide range of resins, while the trimethoxysilane end bonds firmly to substrates such as glass, metal, minerals, and fillers. This dual reactivity enhances mechanical strength, moisture resistance, and long-term durability in coatings, adhesives, sealants, and composite formulations. H-1671 helps optimize dispersion, strengthens interfacial bonding, and boosts overall performance in both waterborne and solvent-based systems.
Price: USD $5.9/KG Download TDS
Structural Formula:
- Chemical Name: 3-Aminopropyl Triethoxysilane APTES
- Molecular Formula: C9H20O5Si
- Molecular Weight: 221.37
- CAS No.: 919-30-2
- EINECS No.: 213-048-4
How (3-Glycidyloxypropyl)trimethoxysilane works?
H-1671 (3-Glycidyloxypropyl)trimethoxysilane is synthesized through the controlled reaction of epichlorohydrin with trimethoxysilane-containing intermediates, creating a molecule that carries both a reactive epoxy group and a hydrolyzable trimethoxysilane group. This structure is the key to its dual functionality.
In application, the trimethoxysilane groups undergo hydrolysis to form silanol groups, which then chemically condense with hydroxyl-rich surfaces such as glass fibers, metal oxides, silica, and mineral fillers. At the same time, the epoxy group can open and react with amines, acids, and other functional groups in resin systems like epoxy, polyurethane, acrylic, and polyester. Through this two-way chemical interaction, H-1671 forms a durable molecular bridge that significantly enhances adhesion, improves mechanical strength, and increases resistance to moisture and environmental stress.
Its ability to modify interfaces and improve compatibility also helps optimize filler dispersion, reduce interfacial defects, and improve long-term stability in coatings, adhesives, sealants, and composite materials. H-1671 delivers both performance enhancement and formulation flexibility, making it a widely trusted choice in advanced material systems.
Applications
- The epoxy group provides reactivity with various resins, while the trimethoxysilane group hydrolyzes to form silanols, which can condense with hydroxyl groups on inorganic surfaces. This forms a “molecular bridge” between inorganic materials and organic resins, acting as an effective coupling agent.
- It can be used as an adhesion promoter, surface modifier, and dispersant, primarily to enhance the bonding strength and compatibility between inorganic mineral fillers, fibers, and polymeric resins, as well as to improve the adhesion and water resistance of resin coatings on inorganic substrates.
- Typical applications include modification of engineering plastics and rubber, paints and coatings, inks, foundry resins, adhesives, sealants, fiberglass, abrasives, and electronic encapsulation materials.
- H-1671 is an excellent adhesion promoter suitable for resins such as epoxy, phenolic, polyester, polysulfide rubber, polyamide, acrylic, PBT, polyurethane, and more.
Physical and Chemical Data
| Property | Value |
|---|---|
| Appearance | Colorless, transparent liquid |
| Purity | >98.0% |
| Density (20℃, g/cm³) | 1.0650–1.0750 |
| Boiling Point (760 mmHg) | 290℃ |
| Flash Point (Closed Cup) | >95℃ |
| Refractive Index (25℃) | 1.4220–1.4320 |
| Color (Pt-Co) | ≤10 |
| Free Chlorine | ≤10 |
Safety, Handling & Storage
- Before using this product, carefully read the latest safety data and toxicity information, as well as proper handling and storage instructions.
- Store in a tightly sealed container in a cool, ventilated, and dry place. Protect from light, fire, and moisture. After opening, keep the container well-sealed to prevent moisture ingress and hydrolysis.
- The shelf life is one year from the date of manufacture. Expired products may still be used if they pass inspection, subject to the buyer’s judgment.
About SIOResin
SIOResin(Guangzhou SIO New Material) is a leading manufacture specializing in developping sustainable products and technologies in new material field. We provide professional solutions regarding water-based polyurethane, water-based acrylic resin, water-based UV-curing resin, silicone resin, additives and curing Agents etc., which have been widely applied in various industries, such as coatings, cosmetics, textiles, biology, automotive and other high-tech industries.
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