MIL-PRF-121, Type I Barrier Material

MIL-PRF-121, Type I barrier material is a U.S. military approved packaging film designed for waterproof, grease-proof, and heat-sealable performance. This high-strength laminate is ideal for wrapping and lining applications where dependable moisture protection is essential.

Manufactured with 60-pound natural kraft paper laminated to polyethylene (PE), this flexible material offers a strong moisture and vapor barrier with excellent heat-seal integrity. It’s commonly used for military preservation packaging, industrial components, and long-term storage applications requiring clean, dry, and corrosion-free protection.

Typical Properties:

• Specification: MIL-PRF-121G, Type I
• Construction: 60# Natural Kraft Paper / Polyethylene
• Yield: 4,970 in²/lb (Calculated)
• Tensile Strength: 25 lbs/in (ASTM D882)
• Tear Strength: >150 grams (ASTM D1922)
• Burst Strength: >45 psi (MIL-PRF-121G)
• Seal Strength: >4 lbs/in (ASTM F88)
• Suggested Seal Conditions: 500°F, 40 psi, 3 sec

Key Features & Benefits:

• Meets MIL-PRF-121G Type I military specifications
• Waterproof, greaseproof, and flexible
• Heat-sealable for secure, moisture-tight closures
• Provides mechanical strength and chemical resistance
• Ideal for defense, aerospace, electronics, and export packaging
• Compatible with desiccants, VCI films, and barrier bags for full preservation systems

Royco Packaging stocks MIL-PRF-121 Type I barrier material for immediate shipment and offers custom roll widths or sheet sizes to match your application.

Available Roll Sizes:

• 36" wide x 600' rolls (8135-00-233-3871)
• 48" wide x 600' rolls (8135-00-543-6574)
• Custom sizes available upon request

Pair MIL-PRF-121 Type I with Royco’s complete line of protection and preservation materials, including:

• MIL-PRF-131 barrier films and foil laminates
• MIL-DTL-17667 neutral wrapping papers
• MIL-D-3464 desiccants and VCI corrosion inhibitors

For bulk pricing, technical support, or application assistance, call 1-877-MIL-SPEC to speak with one of Royco’s packaging specialists.

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