ASTM D6716-01

Standard Test Method for Total Ash in Wet Blue

SCOPE
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.
1.3 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.

General Information

• Status: Historical
• Publication Date: 09-Oct-2001
• ICS: 17.060 - Measurement of volume, mass, density, viscosity
• Technical Committee: D31 - Leather
• Drafting Committee: D31.02 - Wet Blue

Relations

• Replaced By: ASTM D6716-06 - Standard Test Method for Total Ash in Wet Blue
• Effective Date: 01-Oct-2006
• Referred By: ASTM D6714-16(2021) - Standard Test Method for Chromic Oxide in Ashed Wet Blue (Perchloric Acid Oxidation)
• Effective Date: 10-Oct-2001

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D6716–01
Standard Test Method for
Total Ash in Wet Blue
This standard is issued under the fixed designation D 6716; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 5. Significance and Use
1.1 This test method covers the determination of total ash in 5.1 This test method is useful in determining the approxi-
wet blue. mate amount of nonvolatile inorganic material in wet blue.
1.2 Total ash in wet blue may be reported upon a number of This may be in the form of salts or oxides of the elements. In
different bases (for example, fat-free, moisture-free, as re- a mixed-chrome tannage, the approximate percentage of other
ceived, excluding chromium, and so forth). Before proceeding elements in the wet blue may be determined by subtracting the
with any tests, it is very important to determine upon which chromicoxidethatmaybeconvenientlydeterminedontheash.
basis that the total ash is to be reported and to identify all other (See Test Method D 6714.)
test methods that will be required to be executed in order to 5.2 The specified temperature of 600°C is high enough to
achieve the determined reporting method. produce a reproducible result but it does not completely
1.3 This standard does not purport to address all of the dehydratesuchoxidesasaluminumoxide(Al O )andchromic
2 3
safety concerns, if any, associated with its use. It is the oxide (Cr O ). Likewise, such salts as sulfates and phosphates
2 3
responsibility of the user of this standard to establish appro- may be incompletely dehydrated, and if alkalis and chromium
priate safety and health practices and determine the applica- are present simultaneously, oxidation to chromate may occur.
bility of regulatory limitations prior to use. Therefore, caution is advised in drawing conclusions based on
quantitative relations of the elements.
2. Referenced Documents
6. Apparatus
2.1 ASTM Standards:
D 3495 Test Method for Hexane Extraction of Leather 6.1 Crucible, 30- to 50-mL, high-form, platinum or porce-
D 6658 Test Method for Volatile Matter (Moisture) in Wet lain.
Blue by Oven Drying 6.2 Electric Muffle Furnace, with controller or rheostat and
D 6659 Practice for Sampling and Preparation of Wet Blue pyrometer, capable of maintaining a temperature of 600 6
for Physical and Chemical Tests 25°C.
D 6714 Test Method for Chromic Oxide inAshed Wet Blue 6.3 Dessicator, of appropriate size and charged with fresh
(Perchloric Acid Oxidation) dessicant.
6.4 Analytical Balance, capable of accurate weighings to
3. Terminology
within 0.001 g.
3.1 Definitions:
7. Test Specimen
3.1.1 The terms and definitions employed within this test
method are commonly used in normal laboratory practice and 7.1 The specimen shall consist of 2 to 10 g of wet blue from
require no special comment. the composite sample, prepared in accordance with Practice
D 6659.
4. Summary of Test Method
NOTE 1—Typically,wetblueisacombinationoforganichidesubstance
4.1 Theweighedsampleisignitedinairat600 625°Cuntil
in conjunction with inorganic chromium tanning salts. However, under
constant mass is attained. The weighed residual matter is
some circumstances, silicones or other solvent-soluble organo-metallic
termed “ash” and is calculated as a percentage of the original
complexes (including electrolyte-stable fat liquors) are added during
manufacture and may be present within the sample. It may be desirable to
sample.
calculate ash upon an extracted (fat free) basis, and if so, this should be
indicated within the final report. To report ash upon an extracted basis, it
will be necessary to execute Test Method D 3495 on a portion of the same
This test method is under the jurisdiction ofASTM Committee D31 on Leather
sample and weighed out at the same time as the specimen for total ash
and is the direct responsibility of Subcommittee D31.02 on Blue Stock.
Current edition approved Oct. 10, 2001. Published December 2001.
determination.
Annual Book of ASTM Standards, Vol 15.04.
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D6716
8. Procedure 9. Calculation
9.1 Calculate the percentage of ash in the wet blue weighed
8.1 Weigh accurately into a tared cruci
...