Scrim/Foil/Poly Barrier Bags

Scrim/Foil/Poly Barrier Bags – MIL-PRF-131K Class 3 | MIL-DTL-117 Type IV, Class E, Style 1

Scrim/Foil/Poly barrier bags, constructed from MIL-PRF-131K Class 3 materials and packaged per MIL-DTL-117 Type IV, Class E, Style 1, offer rugged, moisture- and puncture-resistant protection for long-term storage and shipping. These industrial-grade, military-specified bags are ideal for safeguarding heavy, sharp, or moisture-sensitive components against environmental threats.

What Are Scrim/Foil/Poly Bags?

Scrim/Foil/Poly bags are laminated flexible barrier bags composed of three main layers:

  • Polyethylene (Poly) for sealing and moisture resistance

  • Aluminum foil for a highly effective moisture and vapor barrier

  • Scrim reinforcement for enhanced tear strength and puncture resistance

These materials are designed to meet the demanding requirements of the U.S. military’s MIL-PRF-131K Class 3 specification, which ensures excellent barrier performance combined with reinforced durability.

Specification Breakdown

MIL-PRF-131K Class 3:

  • Heavy-duty barrier material

  • Reinforced with scrim for tear and puncture resistance

  • Designed for vacuum sealing, corrosion prevention, and extended storage

MIL-DTL-117 Type IV, Class E, Style 1:

  • Type IV: Heavy-duty, multiple-layer construction

  • Class E: Includes a scrim-reinforced foil laminate

  • Style 1: Heat-sealable for airtight closure

These standards ensure the packaging is compliant with DoD packaging regulations, including MIL-STD-2073 and MIL-STD-129.

Common Uses for Scrim/Foil/Poly Bags

1. Military and Defense Packaging

Scrim/foil/poly bags are standard issue for packaging military-grade equipment, parts, and tools that require extended shelf life and resistance to damage from moisture and rough handling.

2. Heavy Industrial Equipment

Used to package large, irregular, or sharp-edged components—such as gear assemblies, castings, and fabricated metal parts—that could puncture standard barrier materials.

3. Export and Overseas Shipment

When equipment is shipped overseas or stored in extreme environments, these bags offer unmatched protection from humidity, salt spray, and physical damage.

4. Corrosion Control for Metals

With the addition of desiccants and humidity indicator cards, scrim/foil/poly bags provide effective corrosion prevention packaging (CPP) for ferrous and non-ferrous metals.

5. Vacuum Sealing Applications

These bags can be vacuum sealed to remove oxygen and prevent degradation of sensitive materials, extending product life during long-term storage.

How to Use

  1. Place the item into the bag.

  2. Insert desiccants or VCIs for corrosion control if required.

  3. Vacuum seal or heat seal the open end using a commercial-grade heat sealer.

  4. Label the package per military standards or contract requirements.

Always follow ESD safety protocols when packaging electronic components.

Why Compliance Matters

Both MIL-PRF-131K Class 3 and MIL-DTL-117 Type IV are essential specifications in government and defense logistics. Using compliant packaging ensures:

  • Contract adherence

  • Product integrity in transit

  • Protection from moisture-related failures

  • Readiness for military inspections and audits

Buy MIL-PRF-131K Class 3 Barrier Bags

At Arms Preservation Inc., we supply scrim/foil/poly bags that meet all MIL-PRF-131K Class 3 and MIL-DTL-117 specifications. Available in custom sizes, flat or gusseted formats, and rolls or pre-made bags.