Purchase your copy of ASTM E – 99() as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards. ASTM-E › Complete Document History Standard Test Method for Maximum Pore Diameter and Permeability of Rigid Porous Filters for Laboratory Use. E() Standard Test Method for Maximum Pore Diameter and Permeability of .. Active Standard ASTM E | Developed by Subcommittee: E

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A number in parentheses indicates the year of last reapproval. A superscript epsilon indicates an editorial change since the last revision or reapproval.

Summary of Test Method 1.

ASTM E128 – 99(2011)

This pore diameter is calculated from the surface tension of the test test method establishes a uniform designation for maximum liquid and the applied pressure. It is the 5.

Apparatus responsibility of the user of this standard to establish appro- 5. Apparatus that has been found satisfactory is illustrated in Fig.


If the test is to be repeated, shape. The uniformity of distribution of pores approaching the 1 This test method is under the jurisdiction of ASTM Committee E on maximum pore size e182 be observed by gradually increasing Laboratory Apparatus and is the direct responsibility of Subcommittee E Cracks, Current edition approved May 10, Originally published as E — 57 T. Last previous edition E atm For test sticks and candles a rubber stopper with a rubber tubing attached is suitable. Clean dry compressed air shall be used.

Other liquids which meet this criterion may be used.

Values for surface tension in Table 1 are for general guidance only and are approximate; surface tension of the liquid used should be determined. Adjust the pressure differ- repeated use.

Standard Filter Crucibles – ROBU® Glasfilter-Geräte GmbH

Calculate the permeability as follows: Keywords p observed pressure of water, cm water Note 6. The surface tension of the liquid creates centimetres. But r radius of the capillary, under the conditions of the method it is more convenient to h height of the column of liquid, measure the diameter in micrometres and the pressure, pin surface tension of the liquid, millimetres of mercury.


Making these substitutions, the expres- d density, sion becomes: Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

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