MIL-PRF-131L Class 1 MIL-SPEC Bags & Pouches (CALPAC ULTRAFOIL 500M)

CALPAC ULTRAFOIL 500M

At Caltex Plastics, we maintain strict adherence to the latest Department of Defense (DoD) guidelines. Our CALPAC ULTRAFOIL 500M packaging is QPL-listed for MIL-PRF-131L Class 1 (General Use). This specification officially supersedes the obsolete MIL-PRF-131K Class 1, as well as the older MIL-PRF-131H and MIL-B-131 standards.

CALPAC ULTRAFOIL 500M is a heat-sealable, flexible barrier material designed for the protection of sensitive military components. By transitioning to the updated 131L standard, this material ensures compliance with general use applications that require water-vapor-proof, greaseproof, and electromagnetic shielding properties.

Features

Key characteristics include:

Current compliance: Fully compliant with MIL-PRF-131L Class 1.
Material structure: Foil-based laminate featuring a linear low-density polyethylene (LLDPE) inner layer for consistent, high-integrity heat sealing.
Moisture barrier: Extremely low moisture vapor transmission rate (MVTR) and oxygen transmission rate (OTR) to prevent corrosion.
Chemical resistance: Superior resistance to grease, oils, and aggressive chemicals.
Electrostatic discharge (ESD) protection: Buried metal construction creates a Faraday cage effect, providing static shielding for sensitive electronics.
Durability: High tensile strength offers excellent puncture and tear resistance during rough handling.
Traceability: All materials are date and lot-coded to ensure full supply chain traceability.
Vacuum compatible: Lightweight and flexible structure easily conforms to product shapes for vacuum packaging and nitrogen flushing applications.
Safety standards: Lead-free and compliant with RoHS 2, REACH, and Conflict Minerals regulations.
Configurations: Available in custom side gusset, bottom gusset, T-Seal bags, and zipper closures.

Protection Properties and Uses

CALPAC ULTRAFOIL 500M functions as a Type I heavy-duty barrier. The material’s multi-layer construction undergoes rigorous laboratory testing to ensure it meets the military packaging physical and barrier requirements.

Barrier Protection

The material provides a seal against environmental contaminants. The foil layer renders the material waterproof and greaseproof, preventing leakage, swelling, or delamination even when exposed to oil. It also serves as a total barrier against light and gases, eliminating the risk of component degradation.

For electronic components, the conductive layer facilitates the dissipation of static charges, protecting integrated circuits (ICs) and printed circuit boards (PCBs) from electrostatic discharge.

Military Applications

Due to its low MVTR, CALPAC ULTRAFOIL 500M is the standard solution for preservation packaging of items destined for long-term storage or sea transfer. Common applications include:

Naval logistics: Packaging parts for naval aviation or vessel repair exposed to high salt spray and humidity levels.
Electronics storage: Protection of static-sensitive devices where a Faraday cage is required.
Vacuum packaging: Sealing mechanical parts that require nitrogen flushing to prevent rust during extended warehousing.

Choose Caltex Plastics for Custom CALPAC ULTRAFOIL 500M Packaging

Caltex Plastics operates as an industrial and commercial plastic packaging manufacturer with over 35 years of experience in defense packaging. We understand that transitioning from MIL-PRF-131K to MIL-PRF-131L requires precision and speed.

We distinguish ourselves through operational efficiency. Caltex Plastics operates 24/7, allowing us to deliver packaging solutions significantly faster than competitors. We maintain the largest selection of rollstock on hand, ensuring that we can convert CALPAC ULTRAFOIL 500M into custom pouches, tubing, or sheets immediately upon order.