SI Black Bonding Agent – Maximum Control for Precision Bonding

Tech-Bond SI Black is a thicker viscosity (1500 cP), Surface Insensitive (SI) Structural Cyanoacrylate (SCA) formulated to fill gaps and provide maximum control when needed. When used with Tech-Bond’s Poly Prep and Accelerator, it delivers permanent molecular bonds across diverse materials, including metals, composites, and difficult-to-bond polymers.

SI Black only stays flexible when it bonds flexible materials. It is a monomer when applied but becomes rigid like other adhesives once it bonds to non-flexible surfaces. This unique characteristic makes SI Black versatile, but it requires correct material pairing when flexibility is critical.

Additionally, SI Black gives technicians the time and control they need for precise work. Its thick viscosity prevents running and dripping, making it ideal for vertical and overhead repairs. The controlled flow allows for accurate placement, especially in tight or awkward spaces.

Unlike consumer adhesives, SI Black works with Tech-Bond’s Poly Prep to activate difficult surfaces like polyethylene (PE), polypropylene (PP), and silicone rubber. Poly Prep permanently alters the surface, preparing it for a molecular bond. When paired with Tech-Bond’s Accelerator, the bond sets quickly, reducing downtime.

Furthermore, SI Black performs exceptionally in gap-filling applications. It bridges seams, fills imperfections, and creates strong, uniform bonds. This makes it the preferred choice for assembly, equipment maintenance, and structural repairs.

SI Black holds up under vibration, heat, and pressure. It remains durable in both shop and field environments. In fact, SI Black consistently performs in hot, cold, dry, and humid conditions.

Technicians trust SI Black when repairs demand speed, strength, and control. Ultimately, SI Black simplifies complex repairs and provides a high-performance solution that holds under pressure.