MIL-PRF-131K

MIL-PRF-131K Flexible Barrier Bags: Basics, Benefits, and Common Uses

MIL-PRF-131K flexible barrier bags are a trusted packaging solution used across industries for their superior protective properties. Developed to meet rigorous military specifications, these high-performance barrier bags are ideal for safeguarding sensitive equipment and components from moisture, oxygen, and other environmental contaminants.

What Is MIL-PRF-131K?

MIL-PRF-131K is a military performance specification that outlines the standards for a flexible barrier material used in protective packaging. The standard ensures that the material provides excellent moisture vapor protection, puncture resistance, and durability under demanding storage and transportation conditions.

Typically constructed as a laminate of polyester, aluminum foil, and polyethylene, MIL-PRF-131K barrier materials are known for their exceptional strength and impermeability.

Key Features:

  • High moisture and vapor resistance

  • Puncture- and tear-resistant

  • Heat-sealable for airtight closure

  • Corrosion prevention for metal parts

  • Long shelf life in extreme environments

Common Uses of MIL-PRF-131K Barrier Bags

MIL-PRF-131K barrier bags are widely used in military, aerospace, electronics, automotive, and industrial manufacturing sectors for protective packaging.

1. Long-Term Storage of Electronics

Delicate electronics such as circuit boards, microchips, and sensors are highly susceptible to corrosion from humidity. MIL-PRF-131K bags help preserve the integrity and performance of these components over extended storage periods.

2. Corrosion Protection for Metal Components

Industries that store or ship metal parts and machinery use these bags to prevent rust and oxidation. When combined with desiccants or volatile corrosion inhibitors (VCIs), they provide unmatched protection.

3. Export and Overseas Shipping

For international shipping, where products may be exposed to various climates and handling conditions, MIL-PRF-131K barrier bags offer an extra layer of assurance against moisture ingress and environmental exposure.

4. Military and Government Packaging

Designed to meet U.S. Department of Defense requirements, these barrier bags are a standard in military logistics and supply chains for packaging tools, weapons, and sensitive gear.

Types of MIL-PRF-131K Barrier Bags

MIL-PRF-131K packaging materials can be fabricated into various bag formats, including:

  • Flat pouches

  • Gusseted bags

  • Zipper closure bags

  • Heat-sealable roll stock

Custom sizes and configurations are also available to suit unique packaging requirements.

How to Use MIL-PRF-131K Barrier Bags

  1. Insert the item to be packaged into the bag.

  2. Add a desiccant or corrosion inhibitor if needed.

  3. Vacuum seal or heat seal the bag for a secure, airtight closure.

  4. Label the bag with contents, date, and any applicable compliance information.

Where to Buy MIL-PRF-131K Barrier Bags

At Arms Preservation Inc., we offer a full range of MIL-PRF-131K barrier packaging solutions, including custom bag sizes, roll stock, and VCI-compatible options. Whether you're packaging sensitive electronics, defense components, or industrial parts, our barrier bags deliver the protection you need.

Contact us today for a quote or to learn more about how MIL-PRF-131K can safeguard your products.