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ASTM D2875-00(2010)

(Test Method)

Standard Test Method for Insoluble Ash of Vegetable-Tanned Leather

Standard Test Method for Insoluble Ash of Vegetable-Tanned Leather

SIGNIFICANCE AND USE
This test method gives the amount of ash remaining in the specimen after water extraction to remove water solubles from the leather in accordance with Test Method D2876. The insoluble ash is used in calculating the combined tannin because it is part of the tanned fiber structure that does not leach from the leather during water extraction.
SCOPE
1.1 This test method covers the determination of the insoluble ash in all types of vegetable-tanned leathers. This test method does not apply to wet blue.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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
31-Mar-2010
ICS
59.140.30 - Leather and furs
Technical Committee
D31 - Leather
Drafting Committee
D31.01 - Vegetable Leather
Current Stage
Ref Project

Relations

Replaces
ASTM D2875-00(2005) - Standard Test Method for Insoluble Ash of Vegetable-Tanned Leather
Effective Date
01-Apr-2010
Referred By
ASTM D6020-00(2020) - Standard Practice for Calculation of (Non-Mineral) Combined Tanning Agents and Degree of Tannage
Effective Date
01-Apr-2010

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ASTM D2875-00(2010) - Standard Test Method for Insoluble Ash of Vegetable-Tanned LeatherASTM D2875-00(2010) - Standard Test Method for Insoluble Ash of Vegetable-Tanned Leather
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ASTM D2875-00(2010) - Standard Test Method for Insoluble Ash of Vegetable-Tanned Leather
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D2875 − 00 (Reapproved2010)
Standard Test Method for
Insoluble Ash of Vegetable-Tanned Leather
This standard is issued under the fixed designation D2875; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 5. Apparatus
1.1 This test method covers the determination of the in- 5.1 Crucible, porcelain or platinum, large enough to hold
soluble ash in all types of vegetable-tanned leathers. This test the leather specimen.
method does not apply to wet blue.
5.2 Electric Muffle Furnace, with temperature controller
1.2 The values stated in SI units are to be regarded as and pyrometer, capable of maintaining a temperature of 600 6
standard. No other units of measurement are included in this 25°C.
standard.
6. Test Specimen
1.3 This standard does not purport to address all of the
6.1 The specimen shall consist of the 5-g leather sample
safety concerns, if any, associated with its use. It is the
remaining after water extraction as directed in Test Method
responsibility of the user of this standard to establish appro-
D2876.Anydeviationfromthissamplesizeshouldbeincluded
priate safety and health practices and determine the applica-
with the analytical results.
bility of regulatory limitations prior to use.
7. Procedure
2. Referenced Documents
2 7.1 Remove the specimen quantitatively from the extraction
2.1 ASTM Standards:
tube, dry at room temperature, transfer to the crucible, place in
D2617 Test Method for Total Ash in Leather
a cold muffle furnace, and ash at 600 6 25°C until the crucible
D2876 Test Method for Water-Soluble Matter of Vegetable-
and contents have reached constant weight as directed in Test
Tanned Leather
Method D2617. Remove the crucible to a desiccator, cool, and
weigh.
3. Summary of Test Method
3.1 The specimen from which the water-soluble matter has
8. Calculation
been removed is heated at 600 6 25°C until carbon is removed
8.1 Calculate the percentage of insoluble ash in the leather
and constant weight is attained. The weighed residual matter is
as follows:
termed “insoluble ash” and is calculated as percentage of the
Insoluble ash, % 5 @~W 2 W !/W # 3100 (1)
original sample. 3 2 1
where:
4. Significance and Use
W = weight of specimen (15 g),
4.1 This test method gives the amount of ash remaining in
W = weight of the crucible, and
the specimen after water extraction to remove water solubles
W = weight of the crucible plus ash.
from the leather in accordance with Test Method D2876. The
9. Precision and Bias
insoluble ash is used in calculating the combined tannin
because it is part of the tanned fiber structure that does not
9.1 The precision of this test method is limited by the lack
leach from the leather during water ex
...

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