MIL-PRF-131K Class 2

flexible mil-prf-131k class 1 bags
heat-sealable mil spec bag
single milspec paper bag
openned moisture barrier bag


The military uses a wide variety of packaged products in the field. However, because military applications often expose these products to challenging conditions, the United States government has strict requirements for its packaging. Our MIL-PRF-131K Class 2 packaging is a flexible, heat-sealable material with kraft backing designed to meet the specifications outlined by the U.S. Department of Defense.

Ideal for protecting lightweight contents from water vapor, MIL-PRF-131K Class 2 barrier material is used in naval, naval aviation and other military applications. At Caltex Plastics, we offer MIL-PRF-131K Class 2 material as roll stock or as custom-made packages in side-gussett, bottom-gussett or T-Seal bag configurations.

Protection Properties

MIL-PRF-131K is a set of specifications established by the U.S. Department of Defense that impacts the types of packaging materials used in military applications. Class 2 MIL-PRF-131K packaging material is made for limited military use. Our flexible, heat-sealable Class 2 packaging is defined by the following protective properties:

  • Low moisture vapor transmission rate (MVTR)
  • Greaseproof material that shows no delamination, leakage or embrittlement when exposed to oil
  • Faraday Cage shielding to protect products from static charge
  • High tear and puncture resistance

To ensure our MIL-PRF-131K Class 2 packaging meets military expectations for performance, we test it rigorously in a laboratory setting before bringing it to market.


Our MIL-PRF-131K Class 2 packaging is made for limited use, which means it should only be used to hold contents weighing 10 pounds or less. Though this option provides less heavy-duty protection compared to MIL-PRF-131K Class 1 and Class 3 materials, Class 2 packaging is ideal for preserving and storing light products that require protection from water vapor.

Due to its low MVTR, our MIL-PRF-131K Class 2 packaging is ideal for naval and naval aviation applications, since packages in these settings are exposed to high moisture and salt levels during transportation and transfer at sea. You can also use MIL-PRF-131K Class 2 packaging to store printed circuit boards, integrated circuits and other products sensitive to static charge.

Become a Caltex Distributor

At Caltex, we rely on a worldwide network of qualified distributors to get our MIL-PRF-131K packaging and other products to customers in a timely manner. We have warehousing and stock locations on the West and East coasts of the United States as well as in Europe and Asia. If you're interested in becoming a Caltex distributor, reach out to us today. We can always use new partners to help us deliver high-performance barrier packaging to commercial and military customers.

Buy MIL-PRF-131K Class 2 Barrier Material From Caltex

Caltex has 35 years of experience producing barrier material and manufacturing custom packaging for customers in demanding industries, including the military. We operate as a MIL-PRF-131K Class 2 packaging manufacturer 24/7 to help fill orders as quickly and cost-effectively as possible.

We also stand by the quality of our products. When you choose Caltex packaging, we guarantee that your material's barrier properties will meet its specified tolerances. To learn more about our MIL-PRF-131K Class 2 packaging for sale and request detailed specifications, contact Caltex Plastics today.


- Ideal for packaging of PCB's and IC's
- Extremely durable buried metal construction give Faraday Cage performance needed to shield against static charges.
- Available with zipper closures.
- Contains no amines or amides, is N-Octanoic acid free and is polycarbonate compatible.
- Custom printing and thermal transfer are available.
- Side gussett, bottom gussett, and T-Seal bag configurations.


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made in the usa aib international certified defense standardization program fda approved

Last updated: November 15th, 2019

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