3-Ureidopropyltrimethoxysilane

3-Ureidopropyltrimethoxysilane (CAS 23843-64-3) is an organosilane coupling agent sold under trade names including Silquest Y-11542, A-1524, Unisil 17, and Y 11542. It carries no assigned E-code. The molecule combines a reactive trimethoxysilyl group with a urea functional group, enabling covalent bonding between inorganic substrates and organic polymer matrices.

In glass-fibre-reinforced composites, it bonds the silica surface to polyurethane or epoxy resins by hydrolyzing to silanol groups that condense with surface hydroxyl sites while the urea end reacts with the resin. In adhesives and sealants for construction and automotive assembly, it acts as a primer or additive to improve adhesion to glass, concrete, and metal under humid conditions.

The product is supplied as an amber liquid and falls under REACH registration requirements for European market supply. It is classified under HS code 29319090. Packaging typically follows standard industrial formats; buyers should confirm available pack sizes and SDS documentation with the supplier prior to ordering.