Vinyltriethoxysilane (IOTA 5151) is a commonly used organosilicon coupling agent with the chemical formula C₈H₁₈O₃Si, and is a colorless, transparent liquid at room temperature.

Its core characteristic lies in the simultaneous presence of both vinyl and ethoxy groups: the vinyl group participates in organic polymer reactions, while the ethoxy group forms stable chemical bonds with the surface of inorganic materials, thus enabling the establishment of strong bonds between organic and inorganic materials.

IOTA 5151 exhibits good solubility and reactivity, and can be widely used in polyethylene crosslinking, wires and cables, electronic packaging, glass fiber reinforcement materials, resin modification, and functional composite materials.

As a basic silane coupling agent, it not only improves interfacial bonding but also enhances heat resistance, moisture resistance, and mechanical properties, making it an indispensable functional additive in modern materials industry.