MIL-PRF-131 Class 3 Barrier Material | Scrim Foil Laminate

MIL-PRF-131 Class 3 barrier material is a QPL-approved, military specification, scrim foil laminate designed to deliver watervaporproof, greaseproof, and mechanical protection with exceptional puncture resistance. Engineered for mission-critical export, storage, and preservation applications, it provides unmatched durability for heavy, sharp-edged, or bulky items that require long-term barrier protection.

Constructed from poly-cotton scrim reinforced with polyethylene and aluminum foil, this laminate combines high tensile strength with low moisture transmission. The result is a tough, flexible, and heat-sealable material ideal for use as barrier bags, covers, or wraps in military, aerospace, and industrial environments.

Typical Properties:

• Specification: QPL MIL-PRF-131L, Class 3, Type I
• Structure: Poly-Cotton Scrim / PE / Foil / PE
• Caliper: 13.3 mil (ASTM D2103)
• Yield: 3,270 in²/lb (Calculated)
• Puncture Resistance: >22 lbs (MIL-STD-3010)
• Break Strength: 66 lbs (MIL-PRF-131L)
• Tensile Strength: 53 lbs (ASTM D882)
• 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: 10 lbs/in (ASTM F88)
• Recommended Seal Conditions: 435°F, 60 psi, 3.0 sec

Available Roll Sizes:

• 36" wide x 600' rolls (8135-01-015-2810)
• 48" wide x 600" rolls 
• Custom widths available upon request

Key Features & Benefits:

• Meets MIL-PRF-131L Class 3, specifications
• Watervaporproof and greaseproof for ultimate corrosion protection
• Reinforced poly-cotton scrim adds superior tear and puncture resistance
• Heat-sealable for airtight closures and moisture integrity
• Withstands rough handling and heavy-duty packaging demands
• Ideal for export packaging, crating, and industrial preservation
• QPL-approved and manufactured in the USA

Common Applications:

• Wrapping or covering large machinery, vehicles, or metal parts
• Lining crates or containers for export and long-term storage
• Fabrication of heavy-duty moisture barrier bags and covers
• Use with MIL-D-3464 desiccants and VCI corrosion inhibitors for complete preservation systems

Royco Packaging stocks MIL-PRF-131 Class 3 Scrim Foil in rolls and sheets for immediate shipment and offers custom slitting, sheeting, and bag fabrication to meet your specific packaging needs.

Pair with Royco’s full range of mission-critical packaging materials, including:

• MIL-PRF-121 laminated kraft papers
• MIL-B-121 creped kraft papers
• MIL-DTL-17667 neutral wrapping papers
• Desiccants, VCI films, and corrosion prevention supplies

For bulk pricing, technical guidance, or application support, call 1-877-MIL-SPEC to speak with one of our packaging specialists.

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