NPFC - MIL-B-121
BARRIER MATERIALS, GREASEPROOF, WATERPROOF, FLEXIBLE, HEAT-SEALABLE
|Publication Date:||16 June 1989|
This specification covers flexible, greaseproofed, waterproofed barrier material used for protection of military supplies and equipment during transportation and storage under all climatic conditions (see 6.1).
Grade A class 1 material is primarily used in the fabrication of greaseproofed, waterproofed packaging bags and also as an intimate wrap instead of grade A, class 2 material. Grade A, class 2... View More
Grade A class 1 material is primarily used in the fabrication of greaseproofed, waterproofed packaging bags and also as an intimate wrap instead of grade A, class 2 material. Grade A, class 2 material is essentially used as an intimate wrap to maintain and protect coatings of oily or soft preservatives in contact with metal surfaces to which applied. It is also used where it is necessary to insulate the metal surfaces of packaged items from hygroscopic or corrosive elements of the pack; where contact of required outer wraps of other barrier materials would contaminate the metal surfaces of the packaged item; or where other more protective barrier materials are not required.
Grade C material is used primarily as an outer wrap of boxed of unboxed preserved material and usually sealed by a wax-dip coating over the closed wrap. Grade C, class 1 material only may be used as an intimate wrap for critical items, preserved with oily or soft preservatives since the surface of the wrap in contact with critical surfaces is noncorrosive and free of transferable material.View Less