Collection: MIL-PRF-131 Watervaporproof, Greaseproof, Flexible Barrier Materials – Royco Packaging

Long-term storage and export packaging leave little room for moisture to get in. MIL-PRF-131 sets the Department of Defense's performance standard for that reason. Royco Packaging stocks the full range of compliant materials with custom conversion available for non-standard project requirements.

Collection: MIL-PRF-131 Watervaporproof, Greaseproof, Flexible Barrier Materials

MIL-PRF-131 laminates deliver watervaporproof, greaseproof, and heat-sealable protection for sensitive equipment and components headed into long-term storage, shipment, or export. The current active revision, MIL-PRF-131L (April 2022), supersedes MIL-PRF-131K and maintains consistent, tested performance across military and industrial applications.

Two primary constructions cover most application needs:

• Class 1 (Plastic-Backed, Non-Woven): Available in Tyvek® and nylon foil laminations, offering lightweight construction, excellent tear resistance, and flexibility across a broad range of packaging formats.
• Class 3 (Scrim-Backed, Woven Fabric): A more rugged construction suited to applications requiring additional durability and structural integrity.

Both classes deliver low water vapor transmission rates and superior seal integrity. We stock MIL-PRF-131 materials in rolls, pre-made pouches, and tubing across multiple sizes for same-day shipment. Need a non-standard dimension? Our team handles custom conversion based on your project specifications.

Pair MIL-PRF-131 barrier materials with MIL-D-3464 desiccants, VCI wraps, and MIL-PRF-121 barrier papers to build out a complete corrosion-control system, sourced from one place.

Why Choose Royco Packaging?

Barrier material specs, constructions, and custom sizing requirements take time that most procurement teams don't have to spare. Here's where we make that process easier:

• Current Spec Compliance: Our materials meet MIL-PRF-131L, the April 2022 active revision, replacing earlier K revisions.
• Multiple Formats In Stock: Rolls, pouches, and tubing available across standard sizes for immediate fulfillment.
• Custom Conversion: We convert MIL-PRF-131 material to project-specific dimensions, so unusual requirements don't stall your timeline.
• Complete System Sourcing: Combine barrier materials with desiccants, VCI wraps, and barrier papers, all sourced through us.
• 40+ Years of MIL-SPEC Knowledge: Our specialists know these materials and can help you select the right class and construction without unnecessary back-and-forth.

Buy our MIL-PRF-131 Watervaporproof, Greaseproof, Flexible Barrier Materials online now. For more information, do not hesitate to call us at 1-800-67-ROYCO or email our team at sales@roycopackaging.com.