ISO 8318 Vibration Tests Using Variable Frequencies
ISO 8318 carries out two methods for a sinusoidal vibration test on complete transport packages. As an ISTA and ISO 17025 certified lab, we realize the importance of ISO 8318 vibration testing. Meeting the ISO 8318 variable frequency and vibration requirements can be difficult. Keystone understands the challenges and guides companies through the process.
Keystone Compliance creates an accurate test plan to eliminate expensive over-testing. Keystone also takes a consultative approach throughout the entire test. Thus, we are in constant communication throughout the test process. Lastly, we take pride in having a reputation of helping customers achieve their package certifications.
Summary of ISO 8318 Vertical Vibration Testing on Filled Transport Packages
The international standard specifies two methods. These methods are both used to carry out a sinusoidal vibration test on a complete, filled transport package or unit load. The testing procedures both use variable frequencies to accomplish these tests. ISO 8318 testing method also assesses the performance of a unit load in terms of the protection that it offers to its contents.
Each shock and vibration method may be performed as either a single or a part of a sequence of tests. The single test investigates the effects of vertical vibration. The sequence of tests measures the ability of a unit load to withstand a distribution system that includes a vibration hazard.
Scope of ISO 8318 Random Vibration Testing
Wherever possible, the ISO 8318 random vibration test is carried out exactly like those used for conditioning. In other circumstances, the test is carried out in atmospheric conditions of those used for conditioning as closely as possible.
Method 1 – The test item is first placed in the fixed attitude on the vibration table. If a superimposed load is required, the loading procedure will comply with ISO 2234. The packaged product is then subjected to a predetermined vertical sinusoidal vibration. These vibrations can vary up and down between 3 Hz and 100 Hz.
The acceleration is measured with an accelerometer which is attached to the table as close as possible to the test item. Lastly, horizontal frequency components may be present. Its acceleration is not recommended to exceed 20% of the value for the vertical component.
Method 2 – A resonance search test is performed over one or more complete sweep cycles applying a suitable lower level acceleration. This typically can range from 0,2 g to 0,5 g. The acceleration is then recorded and measured on the test item and on the table.
The most severe and critical resonances are determined. These may usually be up to three. Lastly, the endurance test is performed.
This is performed by sweeping over a frequency range varying between ± 10% of the defined resonance frequency. The procedure is repeated for other selected severe or critical resonances.
Significance of ISO 8318 Sine on Random Vibration Testing
The ISO 8318 test specimen is placed on a vibration table and vibrated at a frequency which varies. The atmospheric conditions, the duration of the test, the peak acceleration, the attitude of the test item and its method of restraint are all predetermined.
Information included within the report introduces general and specific information. General information may encompass the date, time, location and test engineer. More specific information about the testing protocol and package performance may include, but is not limited to:
- A statement to the effect that the results related only to the test item.
- The number of replicate test items tested.
- A full description, including dimensions, structural and material specifications of the test item.
- A description of contents, if simulated or substituted contents were used.
- The duration of the tests.
- The method of restraint.
- The type of apparatus used.
- Any deviations from the test method described.
Expert ISO 8318 Vibration and Shock Testing
In addition to ISO 8318 vibration testing, Keystone Compliance has a full scope of expertise including leak penetration, cold chain, and drop. Our team strives to give our customers more time and energy on product development instead of testing. Keystone has a full lab of test equipment which permits us to provide short lead times on scheduling.
Contact us to learn first hand why so many companies partner with Keystone to achieve their ISO package testing certification needs.