Viscosity Options: SI Blue, SI Green, SI Black, & SI Gel

Before choosing the size of the kit, choose the viscosity of your Bonding Agent.

Having the right Bonding Agent will, in many cases, improve performance.

Read the information below and then choose the viscosity of your Bonding Agent.

SI Green is specifically formulated as a low-viscosity, wicking-grade bonding agent designed to penetrate tight spaces and hairline cracks that SI Blue and SI Black cannot reach. Unlike SI Blue, which is ideal for general-purpose bonding, and SI Black, which offers controlled, precision application with higher viscosity, SI Green flows rapidly into small gaps, making it perfect for sealing micro-fractures, bonding porous materials, and stabilizing delicate assemblies without disassembly. Its ability to wick into hard-to-access areas sets it apart as a highly specialized solution.

SI Blue is the recommended Bonding Agent for everyday use. It strikes an effective balance between penetration and control, making it versatile across a wide range of bonding applications. SI Blue flows easily to create strong, reliable bonds while still offering a measure of control during the application process.

Tech Bond Blue also has a very good shelf life, making it the dependable choice for a variety of uses across a range of industries.

SI Black Bonding Agent is a high-viscosity formula that offers maximum control and precision during application. Unlike SI Blue, which balances penetration and control for general use, and SI Green, which is designed to wick into tight spaces, SI Black stays where you place it, making it ideal for vertical surfaces, overhead repairs, or situations where you need the bonding agent to remain exactly in position. Its thicker consistency reduces run-off and gives the user the greatest control of all three options.

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What does SI or “Surface Insensitive” mean?

Characteristics of an SI Bonding Agent are:

An SI (Surface Insensitive) Bonding AGent is specifically designed to bond materials that are typically difficult for standard cyanoacrylates, such as porous, acidic, or dry surfaces to glue, specifically, china porcelain, wood, marbles and more. Not included in this list are most polymers polymers. A polymer where CA’s can work … somewhat … effectively. The primary benefits of SI products include:

Faster Bonding on Challenging Surfaces: SI cyanoacrylates cure more quickly and effectively on materials like wood, leather, paper, ceramics, and some plastics where standard formulas would struggle or bond slowly.
Reliable Performance in Less-Than-Ideal Conditions: They perform well even when surfaces have minimal moisture, low surface energy, or slight contamination, reducing failure rates.
Versatility: SI cyanoacrylates expand the range of usable substrates, allowing consistent bonding across metals, polymers, elastomers, and more without requiring perfect surface prep.
Reduced Need for Accelerators: Because they cure quickly on hard-to-bond surfaces, SI cyanoacrylates often reduce or eliminate the need for additional catalysts or surface treatments.
SI products are stabilized: Stabilized CA’s have a longer shelf life.

In short, SI cyanoacrylates offer more forgiving, reliable, and faster bonding across a wider variety of materials and conditions.