Isobutyltriethoxysilane

Isobutyltriethoxysilane (CAS 17980-47-1) is an alkylalkoxysilane that imparts hydrophobicity and improves adhesion at mineral and inorganic surfaces.

Where is Isobutyltriethoxysilane used?

• Construction materials: surface modifier and coupling agent
• Concrete and masonry protection: penetrates porous substrates and bonds covalently to silicate surfaces
• Coatings: adhesion promoter between organic binders and glass, metal or mineral fillers
• Sealants and elastomers: crosslinker or co-crosslinker in silicone and hybrid formulations
• Plastics: surface treatment of mineral fillers such as silica or calcium carbonate, improving dispersion and mechanical performance

Good to know: In concrete and masonry it reduces water ingress without altering appearance, a key requirement for facade and infrastructure treatments.

Commercial specifications

• Drum and IBC quantities
• Technical grade, purity commonly 97% or higher
• Specialty grades with tighter purity thresholds