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ASTM D6716-06

Historical Revision

Standard Test Method for Total Ash in Wet Blue or Wet White

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1.1 This test method covers the determination of total ash in wet blue.

1.2 Total ash in wet blue may be reported upon a number of different bases (for example, fat-free, moisture-free, as received, excluding chromium, and so forth). Before proceeding with any tests, it is very important to determine upon which basis that the total ash is to be reported and to identify all other test methods that will be required to be executed in order to achieve the determined reporting method.

This standard does not purport to address all of the safety concerns, 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.


This test method is useful in determining the approximate amount of nonvolatile inorganic material in wet blue. This may be in the form of salts or oxides of the elements. In a mixed-chrome tannage, the approximate percentage of other elements in the wet blue may be determined by subtracting the chromic oxide that may be conveniently determined on the ash. (See Test Method D 6714.)

The specified temperature of 600°C is high enough to produce a reproducible result but it does not completely dehydrate such oxides as aluminum oxide (Al2O3) and chromic oxide (Cr2O3). Likewise, such salts as sulfates and phosphates may be incompletely dehydrated, and if alkalis and chromium are present simultaneously, oxidation to chromate may occur. Therefore, caution is advised in drawing conclusions based on quantitative relations of the elements.

SDO ASTM: ASTM International
Document Number D6716
Publication Date Oct. 1, 2006
Language en - English
Page Count 2
Revision Level 06
Supercedes
Committee D31.02
Publish Date Document Id Type View
Dec. 1, 2024 D6716-24 Revision
Nov. 1, 2008 D6716-08 Revision
Oct. 1, 2006 D6716-06 Revision
Oct. 10, 2001 D6716-01 Revision
April 1, 2020 D6716-08R20 Reaffirmation
May 1, 2013 D6716-08R13 Reaffirmation