Which component is not authorized for encapsulation?

Friction components are not permitted for encapsulation because they are subjected to wear and tear due to their movement and interaction with other surfaces. Encapsulation is a method used to manage lead hazards by covering lead-painted surfaces with a protective coating that prevents exposure. For encapsulation to be effective, the encapsulated material must remain intact and undisturbed over time. Friction components, such as mechanical parts that move against each other, can wear down any encapsulation material, potentially exposing lead dust and increasing the risk of lead poisoning.

In contrast, windowsills, handrails, and railing caps are considered stable surfaces where encapsulation can effectively contain any lead-based paint, given they are not subject to the same movement and friction that would compromise the integrity of the encapsulation. This stability allows encapsulated surfaces in these categories to remain safer and maintain their protective qualities over time.