What type of sealant is characterized by its ability to stretch and return to its original shape?

Elastomeric sealants are specifically designed to stretch when subjected to movement and then return to their original shape without permanent deformation. This property makes them particularly effective for applications that experience expansion and contraction due to temperature changes, building movement, or vibration. The molecular structure of elastomeric materials allows them to maintain flexibility and resilience, ensuring a tight seal over time while accommodating movement.

In contrast, static sealants are not intended for applications where motion occurs, as they are designed for permanent bonding and do not possess the same level of flexibility. Cork sealants, while useful for certain applications, do not have the same stretchy properties as elastomeric materials and are typically used for sound and thermal insulation. Rigid sealants do not stretch at all; instead, they are intended to provide a hard, inflexible seal, making them unsuitable for areas that experience movement.

Thus, the defining feature of elastomeric sealants is their ability to stretch and recover, which is crucial for maintaining effective sealing in dynamic environments.