How are defense packaging materials tested for shock and vibration resistance?

Defense packaging is tested for shock and vibration resistance through standardized test procedures defined in military standards such as MIL-STD-810 and STANAG guidelines. During these tests, packaging is subjected to simulated shock impacts and vibration frequencies that correspond to real-world transport and operational conditions. This demonstrates that the packaging adequately protects mission-critical equipment even under extreme conditions.

The exact test method depends on the type of equipment, the transport route, and the operational context. In this article, we answer the most frequently asked questions about standards, test procedures, materials, and certification of defense packaging.

What standards apply to shock and vibration testing of defense packaging?

The most widely used standard for shock and vibration testing of defense packaging is MIL-STD-810, an American military standard that describes test methods for environmental stresses such as shock, vibration, temperature, and humidity. In addition to MIL-STD-810, STANAG standards apply within the NATO context to ensure interoperability between member states. In Europe, NEN-EN-ISO and ISTA standards are also referenced for transport packaging.

MIL-STD-810 is divided into individual test methods, each targeting a specific type of environmental stress. Method 514 addresses vibration loading, while Method 516 covers shock loading. Each method specifies the duration, intensity, and directions in which a package must be tested.

The choice of standard is not arbitrary. Defense organizations typically specify in their procurement documentation which standard applies. For Dutch defense projects, national NEN standards apply alongside international MIL-STD requirements. It is therefore essential that a packaging supplier is familiar with multiple standards frameworks and can apply them correctly throughout the design and testing process.

How is shock testing conducted for military packaging?

A shock test for military packaging simulates sudden, intense forces that occur during drops, impacts, or nearby explosions. The package, including its contents, is placed on a shock test table and subjected to defined shock pulses: a brief, powerful acceleration followed by an abrupt stop. The test is performed in multiple directions: vertical, horizontal, and lateral.

The test procedure follows a fixed protocol:

1. Preparation: The package is loaded with the actual equipment or a representative test weight with an equivalent mass and center-of-gravity distribution.
2. Instrumentation: Accelerometers are attached to the package and its contents to measure the transmitted shock energy.
3. Execution: The shock test table generates a pulse with a defined peak acceleration (expressed in g) and pulse duration (in milliseconds), in accordance with the applicable standard.
4. Repetition: The test is repeated multiple times in each direction to ensure consistency.
5. Evaluation: After the test, the package is visually inspected and the contents are checked for damage. The measured data are compared against the permitted limit values.

If the package fails, the design or materials are adjusted and the test is repeated. This iterative process is a standard part of developing a serious defense packaging solution.

How is vibration resistance of packaging measured?

Vibration resistance is measured by placing the package on a vibration platform that generates sinusoidal or random vibrations across a defined frequency range. The test replicates the vibrations that occur during road transport, air transport, or sea transport. Accelerometers record how much vibration energy is transmitted through the package to its contents.

Sine vibration versus random vibration

In a sine vibration test, the package is exposed to a single, constant frequency that is slowly swept across a defined range. This makes it possible to identify resonance frequencies — the frequencies at which the package or its contents are particularly susceptible to amplified vibration. Resonance is dangerous because it can lead to fatigue fractures or the loosening of components.

A random vibration test more realistically simulates transport conditions by applying multiple frequencies simultaneously, comparable to the irregular vibrations of a moving vehicle or aircraft. This test method is more commonly specified in practice for military applications, as operational conditions are rarely predictable.

Evaluating the results

After the vibration test, the package is inspected for structural damage, loose fasteners, and signs of fatigue. The contents are checked for functionality. The measured transmissibility ratio (the ratio between incoming and transmitted vibration energy) must fall within the established tolerances for the package to be approved.

Which packaging materials offer the best shock and vibration absorption?

The best shock and vibration absorption is achieved through a combination of a rigid outer structure and a cushioning interior. Closed-cell polyethylene foam (PE foam) and polyurethane foam (PU foam) are the most commonly used materials for the interior, while aluminum, steel, and high-grade polypropylene are used for the outer shell of military packaging.

The choice of material depends on several factors:

• Equipment weight: Heavier equipment requires a firmer, higher-density foam to absorb shocks effectively without compressing too far.
• Fragility of the contents: Electronic components and optical instruments are more sensitive than mechanical parts and require foam with a lower transmissibility ratio.
• Operational temperature: Some foam types lose their cushioning properties in extreme cold or heat. For defense applications across diverse climate zones, this is a critical consideration.
• Reusability: Military packaging is often deployed multiple times. Materials must withstand repeated loading without significant degradation in quality.

In addition to foam, vibration-dampening suspension systems are also used, in which the contents effectively float within the outer structure. This principle, also known as floating or suspended packaging, offers the highest level of protection for extremely sensitive equipment such as drone electronics or precision optics.

When does defense packaging need to be retested?

Defense packaging must be retested whenever changes occur in the design, materials, contents, or operational requirements. In addition, many military quality systems mandate periodic revalidation even when no demonstrable changes have been made. The frequency depends on the applicable standard and the contractual agreements with the client.

Specific situations that require retesting:

• The equipment to be packaged has changed in weight, dimensions, or configuration.
• The package has sustained visible damage during use or transport.
• The supplier of a critical material or component has changed.
• The transport route or mode of transport has changed significantly — for example, from road transport to air transport.
• The standard to which the package must conform has been revised or tightened.
• The package has reached a certain number of use cycles, as defined in the technical specifications.

Maintaining an accurate log of use, inspections, and any repairs is essential for determining when retesting is necessary. This is not only a quality requirement but also a practical measure to prevent missions from being compromised by packaging that has lost its protective properties.

What is the difference between certified and non-certified defense packaging?

A certified defense package has demonstrably met the requirements of a recognized military or transport standard, documented in a test report from an accredited laboratory. A non-certified package lacks this evidence. In practice, this means that certified packaging has been validated under controlled conditions, while non-certified packaging relies solely on design assumptions or practical experience without formal verification.

The distinction has direct consequences:

• Liability: When mission-critical equipment is damaged inside non-certified packaging, liability becomes unclear. Certification provides demonstrable proof that the packaging met the required standards.
• Eligibility: Many defense contracts require certified packaging by contract. Without certification, suppliers are ineligible for delivery.
• Reliability: Certified packaging has been tested in all relevant directions and under multiple loading scenarios, providing an objective picture of actual protective performance.
• Durability: Certification tests often include fatigue testing and repeated loading, making the service life of the packaging more predictable.

For defense organizations and military suppliers, the use of certified packaging is therefore not a choice but a requirement. The investment in certification far outweighs the risk of damaged equipment, failed missions, or legal liability.

How Faes supports certified defense packaging

Faes.nl develops and manufactures custom defense packaging fully aligned with military standards such as MIL-STD, NEN, and STANAG. With more than 35 years of experience in custom industrial packaging, Faes understands what is at stake when it comes to protecting mission-critical equipment.

What Faes offers defense customers:

• Custom engineering: In-house design and calculation of packaging solutions that meet the specific shock and vibration requirements of your equipment.
• Materials expertise: Selection of the right foam types, suspension systems, and outer structures for maximum protection under extreme conditions.
• Standards knowledge: In-depth knowledge of MIL-STD certifications and military quality requirements, ensuring your packaging meets contractual obligations.
• Sustainable approach: Reusable, circular packaging designed to withstand multiple deployment cycles without loss of protective properties.
• End-to-end solutions: From initial design through production and logistics, all under one roof.

Want to find out how Faes can optimize your defense packaging for shock and vibration resistance? Explore the defense solutions from Faes or get in touch directly for a no-obligation consultation about your specific requirements.