MIL-PRF-131 Class 1 Foil Barrier Material
Product Overview
MIL-PRF-131L Class 1 foil laminate barrier material provides certified protection for moisture and oxygen-sensitive components in defense, aerospace, and industrial preservation applications. This Qualified Products List (QPL) approved material delivers proven performance for long-term storage, expeditionary logistics, and export shipment requirements where barrier integrity is non-negotiable.
Construction & Performance
Multi-Layer Laminate Structure: OPP/PE/Aluminum Foil/PE
Engineered with a four-layer construction combining oriented polypropylene, polyethylene, and aluminum foil, this material achieves exceptional barrier properties while maintaining heat-seal reliability and fabrication flexibility. The aluminum foil core provides a complete moisture and oxygen barrier, while polyethylene layers ensure strong, consistent heat seals critical for hermetic closure integrity.
Technical Specifications:
- Caliper: 4.5 mil (ASTM D2103)
- Yield: 6,050 in²/lb (calculated)
- Puncture Resistance: 20 lbs (MIL-STD-3010)
- Tensile Strength: 28 lbs/in MD (ASTM D882)
- Breaking Strength: 75 lbs (MIL-PRF-131L)
- Seal Strength: 18 lbs/in (ASTM F88)
Barrier Performance:
- Oxygen Transmission Rate: 0.0005 cc/100 in²/day @ 0% RH, 23°C
- Water Vapor Transmission Rate: 0.0005 g/100 in²/day @ 90% RH, 40°C
These ultra-low transmission rates ensure extended preservation windows for corrosion-sensitive metals, electronics, and precision components exposed to humid or marine environments.
Heat Seal Parameters
Recommended Sealing Conditions:
- Temperature: 400°F
- Pressure: 40 psi
- Dwell Time: 1.5 seconds
Proper heat-seal parameters are critical for achieving hermetic closures. Validation testing per ASTM F88 is recommended for production applications to ensure seal integrity meets preservation requirements.
Standard Roll Configurations
- 36" × 600' (NSN: 8135-00-282-0565)
- 48" × 600'
- 50" × 600'
- Custom widths available — contact for MOQ and lead times
All rolls are precision-slit and wound for automated or manual bag-making equipment.
Applications
Primary Use Cases:
- Heat-sealed barrier bags for metal parts, electronics, and assemblies
- Export packaging and overseas shipment preservation
- Long-term warehouse storage (5+ years)
- Integration with desiccant (MIL-D-3464) and VCI corrosion inhibitor systems
- MIL-STD-2073 Level A preservation packaging
Industry Applications:
- Defense logistics and military preservation
- Aerospace component storage and transit
- Industrial equipment mothballing
- Electronics and precision instrument protection
System Integration
MIL-PRF-131 Class 1 material functions as the primary moisture barrier in multi-component preservation systems. For optimal corrosion protection, integrate with:
- Desiccants: Clay or molecular sieve desiccants per MIL-D-3464
- VCI Materials: Vapor corrosion inhibitor films or papers (MIL-PRF-3420)
- Cushioning: Neutral pH barrier papers (MIL-DTL-17667) or foams
- Indicators: Humidity indicator cards to verify barrier performance
Quality & Compliance
- Qualified Products List (QPL) Approved — MIL-PRF-131L
- Manufactured in the USA — domestic content for DFARS compliance
- Available from stock — standard sizes ship same-day or next-day
- Custom converting services — bags, pouches, and sheeting available
Complete Barrier Material Portfolio
Royco Packaging maintains inventory depth across military-specification barrier materials:
- MIL-PRF-121 Type I & Type II — Laminated kraft barrier papers
- MIL-B-121 — Creped kraft barrier paper
- MIL-DTL-17667 — Neutral wrap papers for direct metal contact
- MIL-D-3464 — Desiccants (clay and molecular sieve)
- MIL-PRF-22191, MIL-PRF-3420 — VCI corrosion protection films
Technical Support
For specification review, seal testing validation, or custom material configurations, contact Royco Packaging's technical team at 1-877-MIL-SPEC or sales@roycopackaging.com.
Royco Packaging — Quality Barrier Materials. Made in the USA.