Which of the following characteristics is NOT typical of elastomeric sealants?

Elastomeric sealants are known for their unique properties that make them suitable for various applications in firestop systems and other sealing purposes. One of the fundamental characteristics of elastomeric sealants is their excellent adhesion, allowing them to bond effectively to various substrates. They also exhibit significant flexibility over a range of temperatures, which is crucial in applications where movement or thermal expansion may occur.

High tensile strength is another characteristic of elastomeric sealants, enabling them to withstand stresses and forces without breaking or losing their sealing capability. These properties ensure that the sealants can perform efficiently in dynamic environments and provide long-lasting seals.

In contrast, increased brittleness upon aging is not typical of elastomeric sealants; in fact, one of the advantages of elastomeric materials is their ability to maintain their elastic properties over time. Properly formulated elastomeric sealants are designed to resist becoming brittle as they age, thus ensuring long-term performance and reliability. Therefore, the characteristic of increased brittleness upon aging is the one that does not align with the typical properties of elastomeric sealants.