What is an Adhesive Bond Line? - Assembly & Protection Solutions Division | Parker US
What is an Adhesive Bond line?

The bond line of a material is used to describe where a material contacts components, usually when it is sandwiched in between them. Typically, the most important quality of a bond line is its thickness. For liquid-dispensed materials, bond line is variable and is based on the stand-off that is present in each application.

Bond Line Thickness

To ensure a specific bond line thickness in materials, glass beads are often used. These are small spheres that are added at approximately 1% of the formulation weight to maintain the desired thickness for the application when the material is dispensed. When added at such a low percentage, glass beads can maintain the appropriate bond line thickness without negatively affecting the properties of the material.

Bondline Thickness

Application Note

When bonding metals, glass beads ensure precise bond line thickness by preventing too much adhesive being squeezed out due to over clamping.

Bonding metal application

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