Foam earplug with non-permeable elastomeric coating

摘要

A foam earplug for reception at least partially within the ear canal, including, a body portion formed of resilient foam plastic material having a multiple open cell structure and having a size and shape for at least partial reception within the ear canal. An outer thin coating of a non-permeable elastomeric material forms a skin bonded on the body portion, non-permeable to air, at least in the area of the body portion received within the ear canal. This structure provides an increase in attenuation of sound as compared with the attenuation of sound produced by the resilient foam plastic material without the thin coating of the non-impermeable elastomeric material.