encapsulant

This term is primarily used in technical, industrial, and engineering contexts, specifically within electronics, semiconductor manufacturing, and materials science. It describes the specific substance that performs the act of encapsulation, distinguishing the material itself from the process of encapsulating.

In professional discourse, it is often paired with descriptors of material properties, such as thermal conductivity or dielectric strength. While it shares a root with "capsule," an encapsulant is typically a bulk material like an epoxy or silicone that conforms to the shape of the component it protects, rather than a pre-formed container.