ASTM D2875-00

Standard Test Method for Insoluble Ash of Vegetable-Tanned Leather

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.
1.4 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-Sep-2000
• ICS: 59.140.30 - Leather and furs
• Technical Committee: D31 - Leather
• Drafting Committee: D31.01 - Vegetable Leather

Relations

• Replaced By: ASTM D2875-00(2005) - Standard Test Method for Insoluble Ash of Vegetable-Tanned Leather
• Effective Date: 01-Sep-2005
• Referred By: ASTM D6020-00(2020) - Standard Practice for Calculation of (Non-Mineral) Combined Tanning Agents and Degree of Tannage
• Effective Date: 10-Sep-2000

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D 2875 – 00
Standard Test Method for
Insoluble Ash of Vegetable-Tanned Leather
This standard is issued under the fixed designation D 2875; 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 6. Test Specimen
1.1 This test method covers the determination of the in- 6.1 The specimen shall consist of the 5-g leather sample
soluble ash in all types of vegetable-tanned leathers. This test remaining after water extraction as directed in Test Method
method does not apply to wet blue. D 2876. Any deviation from this sample size should be
1.2 This standard does not purport to address all of the included with the analytical results.
safety concerns, if any, associated with its use. It is the
7. Procedure
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 7.1 Remove the specimen quantitatively from the extraction
tube, dry at room temperature, transfer to the crucible, place in
bility of regulatory limitations prior to use.
a cold muffle furnace, and ash at 600 6 25°C until the crucible
2. Referenced Documents
and contents have reached constant weight as directed in Test
2.1 ASTM Standards: Method D 2617. Remove the crucible to a desiccator, cool, and
D 2617 Test Method for Total Ash in Leather weigh.
D 2876 TestMethodforWater-SolubleMatterofVegetable-
8. Calculation
Tanned Leather
8.1 Calculate the percentage of insoluble ash in the leather
3. Summary of Test Method
as follows:
3.1 The specimen from which the water-soluble matter has
Insoluble ash, % 5 @~W 2 W !/W # 3 100 (1)
3 2 1
been removed is heated at 600 6 25°C until carbon is removed
and constant weight is attained. The weighed residual matter is
where:
termed “insoluble ash” and is calculated as percentage of the
W = weight of specimen (15 g),
original sample. 1
W = weight of the crucible, and
4. Significance and Use W = weight of the crucible plus ash.
4.1 This test method gives the amount of ash remaining in
9. Precision and Bias
the specimen after water extraction to remove water solubles
9.1 The precision of this test method is limited by the lack
from the leather in accordance with Test Method D 2876. The
of homogeneity of the sample in a complex material such as
insoluble ash is used in calculating the combined tannin
leather. It will also vary with the insoluble ash content.
because it is part of the tanned fiber structure that does n
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