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Standard Test Method for Determination of Butane Working Capacity of Activated Carbon

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Standard Test Method for Determination of Butane Working Capacity of Activated Carbon


1.1 This test method covers the determination of the butane working capacity (BWC) of new granular activated carbon. The BWC is defined as the difference between the butane adsorbed at saturation and the butane retained per unit volume of carbon after a specified purge. The test method also produces a butane activity value that is defined as the total amount of butane adsorbed on the carbon sample and is expressed as a mass of butane per unit weight or volume of carbon.

1.2 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For a specific hazard statement, see 7.1.

Significance and Use

The BWC, as determined by this test method, is a measure of the ability of an activated carbon to adsorb and desorb butane from dry air under specified conditions. It is useful for quality control and evaluation of granular activated carbons that are used in applications where the adsorption of butane and desorption with dry air are of interest. The BWC can also provide a relative measure of the effectiveness of the tested activated carbons on other adsorbates.

The butane activity and retentivity can also be determined under the conditions of the test. The butane activity is an indication of the micropore volume of the activated carbon sample. The butane retentivity is an indication of the pore structure of the activated carbon sample.


activated carbon-granular; butane; butane working capacity (BWC); BWC (butane working capacity); butane working capacity-new granular activated carbon; ICS Number Code 71.040.30 (Chemical reagents)

To find similar documents by ASTM Volume:

15.01 (Refractories, Activated Carbon; Advanced Ceramics)

To find similar documents by classification:

71.040.30 (Chemical reagents Including reference materials)

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Document Number


Revision Level

1992 R05 EDITION



Modification Type


Publication Date

Oct. 1, 2005

Document Type

Test Method

Page Count

5 pages

Committee Number