8415 Chemical Suit Protective Bags 6ea Mil-B-131-F Class 1 Cadpak P-131 NEW 143D. The new number for these bags are MIL-PRF-131. These are Brand new old stock never used Army bags be creative many uses and I have a lot of them. Let me know how many you need and I can combine ship for you. MIL-PRF-131 Class 1 is heat sealable and can be used for applications requiring superior tear and puncture resistance as well as protection from light, air and moisture vapor. As an added benefit, conforms to FDA Regulations PART 177-1520 CFR21 for direct food contact when used as supplied and in accordance with sound manufacturing practices. PHYSICAL PROPERTIES MIL-PRF-131, Class 1, Plastic Backing, Film Foil, Water vaporproof, Greaseproof, Flexible, Heat Sealable Barrier Material material thickness 4.5 mils Intended use – 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-131; seam strength and fabrication; water vapor transmission rate; breaking strength; puncture, blocking and curl resistance; contact corrosivity; delamination; and water resistance of markings provide the necessary requirements for protection from exposure to the extremes of the navy/naval aviation environment. Navy/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 materiel that is exposed to the operational naval aviation environment.