Name: Shin-Etsu KBM-503 3-Methacryloxypropyltrimethoxysilane
Brand: Guangzhou Eric Wei Chemical Co., Ltd.

Features Of Shin-Etsu KBM-503 3-Methacryloxypropyltrimethoxysilane

Bifunctional coupling agent with methacrylate group for free-radical polymerization and hydrolyzable methoxy groups for silanol formation.
Enables strong covalent bonding between organic polymers (e.g., acrylics, unsaturated polyesters) and inorganic substrates (e.g., glass, silica, metals).
Improves dispersion stability and interfacial adhesion in filled composites and coatings without compromising cure kinetics.
Low volatility and good hydrolytic stability under controlled handling conditions, supporting consistent processing performance.
Compatible with common solvent-based and aqueous emulsion systems used in industrial formulations.

Typical Applications Of Shin-Etsu KBM-503 3-Methacryloxypropyltrimethoxysilane

Glass fiber sizing for reinforced thermoset composites (e.g., BMC, SMC, pultrusion).
Adhesion promoter in UV-curable and thermal-cure coatings for metal, glass, and ceramic substrates.
Surface modifier for silica and mineral fillers in high-performance acrylic and polyester resins.
Functional additive in dental restorative composites to enhance filler–matrix bonding.
Primer component in structural adhesives and sealants requiring durable substrate adhesion.

Chemical Type	Organofunctional alkoxysilane
Product Form	Liquid
Appearance	Colorless to pale yellow clear liquid
Molecular Weight	248.35 g/mol
Density (25°C)	1.045–1.055 g/cm³
Refractive Index (25°C)	1.428–1.432
Flash Point (Tag Closed Cup)	≥105°C
Solubility	Miscible with common organic solvents (e.g., acetone, ethanol, toluene); hydrolyzes in water

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