Used as a coupling agent in silicone-based adhesives and sealants to improve adhesion to organic substrates. Enhances compatibility between inorganic fillers and polymer matrices in composite materials. Also applied in surface modification of silica and glass to introduce hydrophobic and organophilic properties. Its phenylbutyl group contributes to improved thermal stability and flexibility in cured systems. Commonly found in coatings and encapsulants where moisture resistance and long-term durability are required.