What type of encapsulant creates a surface membrane to prevent fiber release?

Bridging encapsulants are specifically designed to create a surface membrane that effectively prevents the release of asbestos fibers into the air. This type of encapsulant works by forming a thick barrier over the asbestos-containing material, which helps to hold the fibers in place and minimize exposure risk. The membrane created by a bridging encapsulant can withstand physical impacts and environmental factors better than some other options, thus ensuring that the encapsulated material remains intact and safe.

In contrast, other types of encapsulants serve different purposes. For instance, sealing encapsulants are typically intended for use in applications where the goal is to seal small cracks or gaps to reduce water or air infiltration, rather than to form a robust protective layer. Protective encapsulants may offer general protection but do not necessarily create a strong surface membrane like bridging encapsulants. Piercing encapsulants are not a standard category used in the encapsulation of asbestos and may refer to techniques that disrupt the material rather than protect it, further differentiating them from the function of bridging encapsulants.