Abstract: An air bag housing pad cover which is light in weight and soft to the touch and opens in case of crash with certainty over a broad temperature range. A method of producing the air bag housing pad cover efficiently in high yields from a compound composed of a thermoplastic elastomer and a light filler in an amount of 5 to 50 vol % of the compound, the former having a tensile strength higher than 100 kg/cm.sup.2 and a Shore indentation hardness lower than 55 D, and the latter having a true specific gravity lower than 0.7 and a compression strength higher than 50 kg/cm.sup.2.

Abstract: A composite board having an excellent vibration-suppressing sound-shielding performance can be obtained by joining a plurality of board materials with each other by the intermediary of a tacky adhesive. This tacky adhesive contains, as its principal components, one or more kinds of polymers selected from the group consisting of natural rubber, synthetic rubbers, various resins (acrylic resin, silicone resin, etc.). A sheet-like base material such as a paper sheet can be used in association with the tacky adhesive layer in the composite board, and such type of composite boards have an excellent vibration-suppressing sound-shielding performance as compared to the composite boards in which the tacky adhesive layer is not associated with a sheet-like material.