ASTM D4728 Vibration Testing of Shipping Containers

ASTM D4728 package testing evaluates random vibration performance for filled shipping units. As an ISTA and ISO/IEC 17025-certified laboratory, Keystone Package Testing understands the importance of shipping container vibration testing. We help companies meet ASTM D4728 requirements and overcome testing challenges.

Our team delivers accurate test reports quickly. Additionally, our proven process helps prevent product launch delays. Keystone Package Testing partners with customers to achieve package compliance. As a result, you can move forward with confidence knowing your packaging meets performance requirements.

Request a quote to see why so many companies partner with Keystone Package Testing. Have a question about vibration testing? Contact us and we will determine the best course of action.

Summary of ASTM D4728 Vibration Testing of Shipping Containers

ASTM D4728 Vibration test method for random vibration is a rigorous procedure that employs specialized equipment and methodologies to simulate transportation stresses. The test deploys processes to ensure the resilience and durability of packaging under vibration conditions.

ASTM D4728 covers the random vibration testing of filled shipping units. It can be used to test how a container performs in two ways.

• Ruggedness – Assesses the interior packing and means of closure.
• Protection – Assesses if the container provides adequate protection to its cargo when exposed to random vibrations.

ASTM D4728 testing matters because shipping containers experience many stresses throughout distribution. This test simulates those real-world transportation conditions. After random vibration testing, we assess the container for damage or performance issues.

Random vibration testing offers advantages over sinusoidal resonance dwell and sweep tests. For example, random vibration creates less intense resonance buildup. As a result, it reduces fatigue damage compared to other vibration methods.

Additionally, laboratories should base ASTM D4728 testing on field data. This approach creates accurate simulations of actual shipping stresses. Testing labs can use shipment data to improve confidence in simulated testing. Furthermore, vibration affects the shipping container, interior packaging, closures, and contents. Therefore, accurate vibration testing helps verify complete package performance.

Scope of ASTM D4728 Random Vibration Testing

ASTM D4728 testing allows you to analyze each package component. If any element performs poorly, you can make design improvements. These modifications help ensure that all shipping container components perform reliably during random vibration exposure.

Additionally, ASTM D4728 testing supports multiple axes and orientations. However, each position may require different test levels. This approach helps accurately simulate real-world shipping conditions for each container orientation.

ASTM D4728 requires four testing apparatuses.

1. Vibration Test System

Also known as the shaker, the vibration test system will have a table that can support the entire test specimen (shipping container). The table should also be capable of distributing the vibrations equally across the entire test surface.

2. Electronic Controls

The controls will generate vibrations. They are capable of producing the desired power spectral density at the table surface.

3. Closed Loop-Automatic Equalization

A closed-loop controller is required for this type of testing. This means that the controller automatically generates equalized drive signals. The operator will enter the desired PSD data and the equalized vibrations will achieve the desired PSD which will maintain the closed-loop control.

4. Instrumentation

Instrumentation devices such as accelerometers, signal conditioners, analyzers, data display, storage devices, and control techniques are required to measure PSD at the table surface. This may also be beneficial in measuring the response of the test specimen throughout the test. Any instrument used should be accurate +/- 5 % across the frequency range specified.

ASTM D4728 Vibration Laboratory Testing Procedures

ASTM D4728 Vibration Testing subjects packaging to defined testing loading patterns

Conditioning

First, the procedure for ASTM D4728 begins with conditioning if necessary. If there aren’t conditioning requirements, it is recommended to condition if the container materials are climatically sensitive. To begin the test, the specimen shall be placed on the vibration table in its normal shipping orientation.

Test Setup

Next, secure the specimen to the vibration table with proper restraints. The restraints should prevent container movement while allowing about 10 mm (0.4 in) of movement in any direction.

Additionally, random vibrations create large, low-frequency displacements in unpredictable sequences. Therefore, vibration levels must not exceed the PSD profile during startup. Begin the integrity test below the target PSD level. Then, increase the vibration level in controlled increments until it reaches the required test level.

Once the desired level begins, start the test duration. The test time does not include startup or buildup periods. Furthermore, determine the duration based on test specifications or a predefined level of observable damage.

Test Report

After testing, the testing laboratory will compile a comprehensive report based on the D4728 guidelines. This includes:

• Reference to this test, including any deviations from the standard
• Identification of the product being tested
• Method of mounting the product on the carriage of the shock test machine
• Type of instrumentation used
• Record of damage, including a photograph of product damage, if visible
• Conditioning

Expert ASTM D4728 Laboratory Vibration Testing of Shipping Containers

Keystone has a full lab of test equipment which permits us to provide short lead times on scheduling. We can accommodate flexible and rigid packages of all sizes, including large pallets. Our team strives to give our customers more time and energy on product development instead of testing.

Keystone Package Testing is proud to provide customers with reliable testing and reports. Our professional engineers are experienced and have a thorough knowledge of industry standards. Let’s get started! Request a quote or contact us at (724) 657-9940.

For more referenced ASTM standards and similar testing, please follow the links below:

• ASTM D996 Terminology of Packaging and Distribution Environments
• ASTM D4169 Practice for Performance Testing of Shipping Containers and Systems
• ASTM D4332 Practice for Conditioning Containers, Packages, or Packaging Components for Testing
• ISO 13355 Packaging—Complete, Filled Transport Packages and Unit Loads—Vertical Random Vibration Test

Interested in the EMC/EMI, climatic, dynamic, shielding effectiveness, or IP Code testing of a product? Follow the corresponding links or www.keystonecompliance.com for more information.