The barrier materials covered by this specification are intended for use 'in specialized military methods of preservation. The combination of all performance characteristics of MIL-PRF-85036; seam fabrication and strength (face to face and face to back seal); water vapor transmission rate; breaking strength; aging, puncture, blocking and curl resistance; contact corrosivity; and delamination provide the necessary requirements for protection from exposure to the extremes of the naval aviation environment. Naval aviation items are exposed to high moisture, high salt concentration, transfer at sea, rough handling, and minimal storage conditions. There are no commercial equivalents that meet the physical, mechanical, and corrosion requirements necessary to protect jet engines that are exposed to the operational naval aviation environment.