3-Isocyanatopropyltriethoxysilane

3-Isocyanatopropyltriethoxysilane (CAS 24801-88-5) is an isocyanate-functional silane coupling agent sold under trade names including KBE 9007, YH 9030, and I 7840. It bridges organic polymers and inorganic substrates by presenting both a reactive isocyanate group and hydrolysable ethoxysilyl groups within the same molecule.

In polyurethane coatings and adhesives, the isocyanate group reacts with hydroxyl or amine functionalities in the polymer matrix while the silane end bonds covalently to glass, metal, or mineral fillers, improving adhesion and moisture resistance. In sealant formulations, it functions as a crosslinker that builds network density at the substrate interface.

This material is supplied as a neat liquid and is subject to REACH registration requirements within the EU. It carries HS code 29319090 for customs classification. Buyers should confirm moisture-controlled packaging specifications, as the isocyanate group is sensitive to hydrolysis during storage and transit.