Types A-1 and A-2 gaskets are intended for use where tightness is desired between two flat surfaces, and are designed to be fastened by American National Standard No. 10 screws and cemented to hatch covers or ballistics doors by a non-hardening acetone cement. Type B gaskets are fitted to retainer strips and secured with adhesive, ⅛ inch by ⅝-inch flat bar and No. 10 screws. These gaskets are of interest to the US Navy because they are used with shipboard unique enclosures that have rigorous performance requirements.