▎ 摘　　要

NOVELTY - The material (200) comprises a first layer including a first flexible material, and the first flexible material is provided to be impermeable to a lightweight gas. The second layer is coupled with the first layer, and the second layer includes a second flexible material, the second flexible material having less flexibility than the first flexible material. The first flexible material is provided to be impermeable to helium. The first flexible material includes graphene oxide. The third layer is coupled with one of the first layer and the second layer, the third layer includes a third flexible material, the third layer further includes an adhesive. USE - Material for use in construction of an acoustic barrier assembly. ADVANTAGE - The material is suitable to allow the acoustic barrier to be introduced into the space between the two walls of the structure that is to be insulated. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) an acoustic barrier assembly comprises a first wall formed of a material; (2) a method of assembling an acoustic barrier assembly; DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of the material in a flexed state. Material (200)