Here are some Suggestions on choosing the breathability test method:
First, the test methods used by the equipment should comply with relevant national policies and industry standards. For example in the national food plastic packaging, containers, tools and other products production license review specified in the plastic membrane permeability test method is the differential method (GB/T 1038), so to perform testing and relevant institutions related to the film the permeability test equipment manufacturers use methods should be differential method. For other institutions engaged in testing and scientific research, national standards should be implemented.
Secondly, choose according to the market application. Both the isobaric and differential pressure methods have their own set of data systems. Although many organizations are trying to unify the two data systems, there are no substantive conclusions or results.Therefore, the users of the equipment should choose the test equipment with the same principle as the national institution when selecting the air permeability testing equipment, and avoid the different impact of the test method on the index conclusion of the material.
Thirdly, for some users with special requirements, it is necessary to fully understand the detection advantages of pressure difference method and isobaric method. For example, the container production enterprise chooses the pressure method equipment, can add the attachment to realize the whole test of the container, so the test data is more practical. If there are a large number of test gases, select the differential pressure method. If test costs are factored in, differential pressure is a more economical option.
