MIL-PRF-131 is a US military performance specification pertaining to heat-sealable, greaseproof, flexible foil laminate materials having low water vapor transmission characteristics. The current specification is MIL-PRF-131L, which supersedes MIL-PRF-131K, MIL-PRF-131J, and MIL-B-131H. The specification is further divided into Class 1 & Class 3 material. Prior versions of the MIL-PRF-131 spec included a Class 2 material which, while no longer officially listed, is still available for purchase.
Royco Packaging stocks MIL-PRF-131 material in rolls, pouches (bags), and tubing of various sizes for immediate shipment. We can also convert MIL-PRF-131 any size to meet the needs of your project. Call us at 1-877-MIL-SPEC and one of our product specialists will be happy to assist you.