Measuring and testing – With fluid pressure – Porosity or permeability
Patent
1994-08-17
1995-11-21
Williams, Hezron E.
Measuring and testing
With fluid pressure
Porosity or permeability
G01N 1508
Patent
active
054676398
ABSTRACT:
A portable test apparatus and method for measuring and comparing the resistance of protective clothing materials, and other materials, to penetration by liquids, pathogens, and fluid transmissible particles. The test apparatus employs weights with center holes, which fit over an elongated weight support assembly which is held upright in a frame. To perform the test, a highly resilient and absorbent sponge is placed in a small tray and soaked with a test fluid, the test material is then placed over the sponge, a piece of absorbent paper is placed over the test material, the frame is centered above the test material, the elongated weight support assembly is placed through the center hole of the frame until the flat surface of the weight support assembly is in contact with the absorbent paper, and weights are placed onto the elongated weight support assembly. When the full pressure of single or multiple weights and elongated weight support assembly are on the test material, the test begins. Pass/failure is determined by observing the test material through the end of the transparent rod. If the fluid appears under the support member tip within a predetermined period of time, e.g., five minutes, the material fails at the weight applied. If no fluid appears, the test is repeated, with additional weights, until the material fails. After repeated samplings, the failure threshold is determined and the material's fluid pressure resistance is recorded.
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Larkin Daniel S.
Mayo Foundation for Medical Education and Research
Williams Hezron E.
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