MIL-PRF-131 Class 1 Foil Barrier Material

MIL-PRF-131 Class 1 barrier material is a Qualified Products List (QPL) approved foil laminate engineered for maximum protection against moisture, oxygen, grease, and contaminants. Built for mission-critical preservation, this high-performance material ensures long-term integrity of sensitive components and equipment during storage and shipment.

Constructed with a multi-layer structure of OPP (Oriented Polypropylene) / Polyethylene / Aluminum Foil / Polyethylene, this material delivers exceptional barrier strength and heat-seal reliability while maintaining flexibility for easy fabrication into bags, pouches, and wraps.

Typical Properties:

• Specification: MIL-PRF-131L, Class 1
• Structure: OPP / PE / Foil / PE
• Caliper: 4.5 mil (ASTM D2103)
• Yield: 6,050 in²/lb (Calculated)
• Puncture Resistance: 20 lbs (MIL-STD-3010)
• Tensile Strength: 28 lbs/in (ASTM D882)
• Breaking Strength: 75 lbs (MIL-PRF-131L)
• Oxygen Transmission Rate (OTR): 0.0005 cc/100 in²/day (@ 0% RH, 23 °C)
• Water Vapor Transmission Rate (WVTR): 0.0005 g/100 in²/day (@ 90% RH, 40 °C)
• Seal Strength: 18 lbs/in (ASTM F88)
• Recommended Seal Conditions: 400 °F, 40 psi, 1.5 sec

Available Roll Sizes:

• 36" wide x 600' rolls (8135-00-282-0565)
• 48" wide x 600" rolls
• 50" wide x 600' rolls
• Custom widths available upon request

Key Features & Benefits:

• Meets MIL-PRF-131L Class 1 specifications
• Watervaporproof and greaseproof barrier for superior corrosion prevention
• Heat-sealable for airtight closures and moisture resistance
  
• Provides low OTR/WVTR values for long-term storage and export protection
• Ideal for defense, aerospace, electronics, and industrial applications

Common Applications:

• Heat-sealed bags and pouches for metal parts and assemblies
• Export crating and equipment preservation
• Long-term storage and corrosion-sensitive packaging
• Use with desiccants (MIL-D-3464) and VCI materials for complete preservation systems

Royco Packaging stocks MIL-PRF-131 Class 1 barrier materials for immediate shipment and offers custom roll sizes, sheeting, and converted bags to fit your specific packaging requirements.

Royco’s complete line of mission-ready packaging materials, includes:

• MIL-PRF-121 Type I & Type II laminated kraft papers
• MIL-B-121 creped kraft papers
• MIL-DTL-17667 neutral wrap papers
• MIL-D-3464 desiccants and VCI films

For technical support or bulk pricing, call 1-877-MIL-SPEC to speak with a Royco Packaging specialist.

Royco Packaging — Mission Critical Protection. Made in the USA.