Final answer:
Encapsulation is the method used to seal off disintegrating asbestos by applying a sealant, preventing fibers from becoming airborne. It is a common technique for managing asbestos in place.
Step-by-step explanation:
A method of sealing off disintegrating asbestos is called encapsulation. Encapsulation involves covering the asbestos material with a sealant, which can be in the form of a liquid or an adhesive material that binds the fibers together and prevents them from being released into the air.
This method is one of the preferred ways to manage asbestos in situ, that is, without removing it, especially when the asbestos-containing materials are not too damaged or disturbed.