An adherend. The surface of a sealant or adhesive.

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Multiple Choice

An adherend. The surface of a sealant or adhesive.

Explanation:
Understanding how bonding surfaces are described helps you pick the right term. The surface that receives the adhesive or sealant—the material being bonded—is known as the substrate. In other words, the adherend is the surface of the material you’re bonding to, and substrate is the common term for that surface. The other terms don’t describe this surface: sidelite is a window portion, tackiness refers to how sticky the adhesive feels, and ultraviolet light is a curing method rather than a surface designation.

Understanding how bonding surfaces are described helps you pick the right term. The surface that receives the adhesive or sealant—the material being bonded—is known as the substrate. In other words, the adherend is the surface of the material you’re bonding to, and substrate is the common term for that surface. The other terms don’t describe this surface: sidelite is a window portion, tackiness refers to how sticky the adhesive feels, and ultraviolet light is a curing method rather than a surface designation.

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