Propyltriacetoxysilane

Propyltriacetoxysilane (CAS 17865-07-5, EC 241-816-9), also known as n-propyltriacetoxysilane or propylsilanetriol triacetate, is an acetoxysilane crosslinker belonging to the silicones and silicates chemical family. It carries no assigned E-code and is identified in chemical databases under the InChIKey IDUFJKUVFJFHEC-UHFFFAOYSA-K.

In sealant and adhesive formulations, propyltriacetoxysilane functions as a moisture-cure crosslinker: upon exposure to atmospheric humidity, the acetoxy groups hydrolyze and release acetic acid, enabling Si-O-Si network formation that builds cohesive strength. In coatings for construction and automotive substrates, it acts as a surface modifier, improving adhesion between inorganic mineral surfaces and organic polymer matrices.

Propyltriacetoxysilane is supplied as a transparent liquid, typically at 98% purity grade, and is registered under REACH. Procurement teams should confirm SDS documentation and packaging format directly with the supplier, as container sizes vary by application volume and regional distribution agreements.