Isobutyltrimethoxysilane

Isobutyltrimethoxysilane (CAS 18395-30-7) is an organosilane monomer used to modify inorganic surfaces and improve compatibility between mineral substrates and organic polymer matrices. It functions as a surface treatment agent and crosslinker, bridging the gap between hydrophilic fillers and hydrophobic resins. In coatings and sealants, it acts as a surface modifier for silica.

This chemical treats calcium carbonate and other mineral fillers, improving dispersion and reducing moisture sensitivity in the final formulation. Construction sealants use it as a crosslinking agent. It enhances adhesion to glass, concrete, and metal substrates. In plastics compounding, it treats reinforcing fillers to improve mechanical performance and long-term durability of the polymer matrix.

Electronics manufacturers apply it as a surface treatment for encapsulants and underfill materials where controlled hydrophobicity and adhesion to substrates are critical for the final product. Isobutyltrimethoxysilane is supplied as a clear liquid in standard packaging ranging from drums to IBC containers. Technical grade is the primary commercial form for industrial use.

Purity levels are typically at 97% or higher. Buyers sourcing for sensitive electronics or high-performance polymer applications should confirm purity specifications and moisture content with the supplier. Procurement teams should ensure the material meets necessary industrial requirements. Proper storage in a cool, dry environment is essential to maintain the stability of this organosilane monomer.