Abstract: A method of forming acoustic holes in a composite sound-insulating material includes creating a image of at least a portion of an array of holes and transferring the image to an ultraviolet (UV) radiation transparent medium. The method continues with positioning the medium in contact with a UV-curable mask and exposing the medium-covered mask to UV radiation to cure the UV-exposed areas. The method further includes removing the uncured mask material to create an abrading mask that includes a plurality of holes in a desired pattern. The method also includes positioning the abrading mask in contact with the sound-insulating material and directing a stream of abrasive matter at the abrading mask to create perforations in the sound-insulating material that correspond to the pattern of holes in the abrading mask.