Enhanced aerosol test for assessing filter integrity
US10151679B2 · kind B2 · utility
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27Claims
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Key dates
| Filing date | Mar 1, 2016 |
| Grant date | Dec 11, 2018 |
| Priority date | — |
| Expiry date | Mar 1, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2015/0846
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of aerosol integrity testing of filters, capable of detecting single defects that are less than 20 μm in diameter, and even as small as 2 μm in diameter, in liquid sterilizing grade filters such as filter cartridges. The method challenges the filter in a dry state with a particle stream of aerosol particles of the appropriate size and in the appropriate concentration, such that at least one or more of the particles in the stream will penetrate a defective region or regions within the membrane but will not penetrate in the integral region of the membrane. Wetting of the filter is not required.
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