PPP-B-1055B, FEDERAL SPECIFICATION: BARRIER MATERIAL, WATERPROOF, FLEXIBLE (10 JUN 1975) [NO S/S DOCUMENT]

PPP-B-1055B, FEDERAL SPECIFICATION: BARRIER MATERIAL, WATERPROOF, FLEXIBLE (10 JUN 1975) [NO S/S DOCUMENT]., This specification covers barrier materials for use in packaging and packing applications which require waterproofness plus a high degree of resistance to permeation by water vapor (see 6.1).