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| Review of Quality Standards and Specifications |
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Bubble Point Testing
E3278: Standard Test Method for Bubble Point Pressure of Woven Wire Filter Cloth (current)
Published by ASTM Subcommittee E29.01 for Sieves, Sieving Methods, and Screening Media, under Committee E29 for Particle Size Measurements, effective 2021.
This test method was developed to address the shortcomings of the historic ARP901 reference, and provides a technically robust document with the application of a pore size calculation factor for each filter cloth specification, based on the most current computer geometric modeling techniques. The Standard offers a comprehensive review of bubble point physics, and identifies, controls, and mitigates uncertainty from bubble point test specific variables, resulting in more accurate and consistent test results. The pore size calculation factors are on average 15% more conservative than the discrepant single factor of ARP901. |
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F316: Standard Test Methods for Pore Size Characteristics of Membrane Filters by Bubble Point and Mean Flow Pore Test (current)
Published by ASTM Subcommittee D19.08 for Membranes and Ion Exchange Materials, under Committee D19 for Water, effective 1970
The Scope specifically states that this test method is to be used for "membrane" filters (typically as related to water) and for 0.1 up to 15.0 micrometer pore sizes. Accordingly, it is technically not applicable to bubble point testing E2814 specifications, and which commonly range from about 3 to 300 micrometer pore diameter. |
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ARP901: Aerospace Recommended Practice, Bubble Point Test Method (current)
Published by SAE International, effective 1968
This historic test method has been widely referenced, but is only a recommended practice, and concludes by suggesting a tortuosity factor of 1.65 which today is considered controversial. |
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