Mil-PRF-131 Class 1

MIL-PRF-131L Class 1: The Gold Standard in Military-Grade Barrier Protection

What Is MIL-PRF-131L Class 1?

MIL-PRF-131L Class 1 is a high-performance, water-vapor-proof aluminum foil laminate, representing the peak of protective barrier technology. As a military-grade material, it must meet stringent specifications set by the U.S. Department of Defense (DoD) for use across all defense agencies.

These rigorous standards ensure unmatched protection and full traceability. At [Your Company Name], we offer multiple QPD-listed materials approved by the U.S. Naval Labs Qualified Products Database (QPD) for MIL-PRF-131L Class 1 applications.

Key Update: As of April 2022, the specification transitioned from MIL-PRF-131K Class 1 to MIL-PRF-131L Class 1, maintaining the same performance requirements while streamlining the standard by removing Class 2 materials.

Fully Customizable Barrier Solutions

Our MIL-PRF-131L Class 1 materials can be precisely converted into: ✔ Custom barrier bags – Tailored to fit your product’s exact dimensions. ✔ Roll stock – Ideal for small batches or specialized applications.

Thanks to its inner polyethylene layer, this material self-seals effortlessly with a handheld heat sealer (best results with a straight-bar sealer applying heat from both sides). This versatility allows for the creation of custom vapor barrier bags, including those meeting Mil-DTL-117 specifications.

Performance Specifications: Why MIL-PRF-131L Stands Out

What makes MIL-PRF-131L the ultimate protective solution? This material delivers: ✔ Superior tear and puncture resistance – Built to withstand harsh handling. ✔ Unmatched barrier properties – Shields against moisture, corrosion, oxidation, and external contaminants.

It is ideally suited for large or high-value items requiring long-term protection during:

• Shipment
• Storage
• Field deployment

Rigorous Testing for Uncompromising Quality

To earn a place in the U.S. Naval Labs QPD, MIL-PRF-131L materials undergo extensive testing. Every batch must match the tested sample exactly—any unapproved modification risks rejection and removal from the QPD.

Mandatory Testing Conditions:

• Relative Humidity: 50% (±5%)
• Temperature: 73°F (±3°F / ~23°C ±1.5°C)

At Creopack, we guarantee full compliance, ensuring your critical assets receive maximum, long-lasting protection.

Why Choose Creopack?

• Certified MIL-PRF-131L Class 1 materials – Tested and approved for defense applications.
• 100% customizable – Bags, rolls, or bespoke formats to fit your needs.
• Easy, tool-free sealing – Compatible with standard heat sealers.
• Trusted expertise in defense, aerospace, electronics, and pharmaceutical sectors.