The results of these tests are intended to be used for qualitative purposes. The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. Packaged products transported via the feeder aircraft network are liable to experience altitudes as high as 19, feet. When exposed to these high-altitude conditions, products or packaging systems, or a combination thereof, may be affected negatively by the resultant pressure differential.
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Common examples of high-altitude transportation are feeder aircraft and ground transportation over high mountain passes. A feeder aircraft is a small aircraft used to transport express air package; in some cases, the aircraft is not pressurized.
Packages that are transported by this method can experience high altitudes that negatively affect the package or its contents due to the pressure differential. The test can be used to evaluate the effects of high altitude on packaging and also identify areas of design and engineering that need improvement to better withstand high altitudes.
The vacuum chamber is suitable if it can withstand one atmosphere pressure differential fitted with a flat-vacuum-tight cover. And altitude chamber is also acceptable. There should be a vacuum gauge, inlet tube from a source of vacuum, and an outlet tube to the atmosphere attached to the chamber. The inlet and outlet tubes should have hand operated valves. The chamber must be large enough to contain the test specimen, including any expansion that may occur during testing. The system should be representative of actual packaging systems, including primary and secondary packaging.
The test specimen will need to be conditioned prior to testing. The conditioning criteria is as follows: The test specimen shall be conditioned to 5. The test specimens are tested in the conditioned environment.
However, these conditions may be altered based on but not limited to knowledge of the real shipping environment, product value, and desired damage level. After the package has been conditioned, testing can begin. The test specimen should be placed in the vacuum chamber. The valves should the be adjusted so that the inlet valve is closed and the outlet valve is opened.
Then, the vacuum source should be adjusted so that the gauge rises at about m s until it reaches the desired pressure. Once the desire vacuum is achieved, it should be maintained for 60 minutes 1 hour. Again, this can be modified based on but not limited to knowledge of the real shipping environment, product value, and desired damage level.
To release the pressure, open the inlet valve to release the vacuum at the same rate as the vacuum was created. Once the vacuum is released, open the chamber and inspect the package and its contents for any damage. The test laboratory will record the test method and results in a report that follows guidelines of ASTM D If the package is free from damage at the conclusion of the altitude test, it is recommended that the package be reassembled to undergo other testing.
Follow up testing will help determine if the pressure differential had any affect on the package that was not visible at first. Keystone Package Testing is proud to provide customers with reliable testing and reports. With international accreditation, competitive pricing, and quick turnaround time, Keystone is the right package testing partner.
Our transit testing engineers are experienced and have thorough knowledge of industry standards. They are prepared to guide you through the package testing process. Request a quote or contact us at