ASTM D2875-00(2020)

Standard Test Method for Insoluble Ash of Vegetable-Tanned Leather

SIGNIFICANCE AND USE
4.1 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 30-Nov-2020
• ICS: 59.140.30 - Leather and furs
• Technical Committee: D31 - Leather
• Drafting Committee: D31.01 - Vegetable Leather

Relations

• Refers: ASTM D2617-17a - Standard Test Method for Total Ash in Leather
• Effective Date: 01-Sep-2017
• Refers: ASTM D2617-17 - Standard Test Method for Total Ash in Leather
• Effective Date: 01-Apr-2017
• Refers: ASTM D2617-12 - Standard Test Method for Total Ash in Leather
• Effective Date: 01-Apr-2012
• Refers: ASTM D2876-00(2010) - Standard Test Method for Water-Soluble Matter of Vegetable-Tanned Leather
• Effective Date: 01-Apr-2010
• Refers: ASTM D2617-06 - Standard Test Method for Total Ash in Leather
• Effective Date: 01-Oct-2006
• Refers: ASTM D2876-00(2005) - Standard Test Method for Water-Soluble Matter of Vegetable-Tanned Leather
• Effective Date: 01-Sep-2005
• Refers: ASTM D2876-00 - Standard Test Method for Water-Soluble Matter of Vegetable-Tanned Leather
• Effective Date: 10-Sep-2000
• Refers: ASTM D2617-96 - Standard Test Method for Total Ash in Leather
• Effective Date: 10-May-1996
• Refers: ASTM D2617-96(2001) - Standard Test Method for Total Ash in Leather
• Effective Date: 10-May-1996

Overview

ASTM D2875-00(2020), Standard Test Method for Insoluble Ash of Vegetable-Tanned Leather, establishes a reliable procedure for determining the insoluble ash content in all types of vegetable-tanned leathers. Developed by ASTM International, this standard ensures accurate measurement of residue remaining in leather after water-soluble substances are removed. The insoluble ash provides valuable insights into the composition of the tanned leather fiber structure, essential for quality assessment and tannin calculations. Note: This standard does not apply to wet blue leather.

Key Topics

• Scope and Applicability:

  • Covers the determination of insoluble ash in vegetable-tanned leathers.
  • Excludes wet blue leathers.
  • Specifies that SI units are the reference measurement system.

• Purpose of the Test:

  • Measures the amount of ash remaining after extraction of water-soluble matter.
  • Used in the calculation of combined tannin.
  • Assesses structural components that remain bound in the fiber matrix, unaffected by water leaching.

• Test Methodology:

  • Removed water-soluble matter from a leather sample.
  • The dried sample is ashed at a controlled temperature (600 ± 25°C) in a muffle furnace.
  • The resulting residue (insoluble ash) is weighed and calculated as a percentage of the original sample.

• Precision:

  • High repeatability, with duplicate results (by same or different operators or labs) expected to agree within 0.1% insoluble ash.

• Safety and Compliance:

  • Users must follow appropriate safety, health, and environmental practices.
  • Recognizes alignment with WTO technical standards principles.

Applications

ASTM D2875-00(2020) is widely used in the leather industry and associated laboratory environments for the following:

• Quality Assurance in Leather Manufacturing:

  • Verifies the consistency and purity of vegetable-tanned leathers.
  • Provides critical information for refining tanning processes and materials.

• Tannin Calculation:

  • Used to determine combined tannin content, which is essential for categorizing and pricing leather goods.

• Research and Product Development:

  • Supports research in leather chemistry by identifying non-soluble components.
  • Facilitates the study of the effects of various tanning agents.

• Regulatory Compliance and Trade:

  • Ensures that leather products meet international standardization and regulatory requirements, especially for export-driven businesses.

Related Standards

To ensure comprehensive analysis and compliance, the following related ASTM standards are frequently referenced alongside ASTM D2875-00(2020):

• ASTM D2876 - Test Method for Water-Soluble Matter of Vegetable-Tanned Leather
  Measures extractable substances prior to insoluble ash determination.

• ASTM D2617 - Test Method for Total Ash in Leather
  Covers the determination of all ash content, useful for broader compositional analysis.

Practical Value

Applying ASTM D2875-00(2020) offers several practical benefits, such as improved quality control, reliable product consistency, and enhanced traceability in the leather supply chain. It helps manufacturers, laboratories, and industry regulators optimize production processes and provide assurances to consumers regarding the integrity of vegetable-tanned leather products.

Keywords: insoluble ash, vegetable-tanned leather, leather testing, ASTM D2875, ash content, tannin content, leather industry standards, quality assurance, leather composition, leather analysis

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D2875 − 00 (Reapproved 2020)
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 and constant weight is attained. The weighed residual matter is
termed “insoluble ash” and is calculated as a percentage of the
1.1 This test method covers the determination of the in-
original sample.
soluble ash in all types of vegetable-tanned leathers. This test
method does not apply to wet blue.
4. Significance and Use
1.2 The values stated in SI units are to be regarded as
4.1 This test method gives the amount of ash remaining in
standard. No other units of measurement are included in this
the specimen after water extraction to remove water solubles
standard.
from the leather in accordance with Test Method D2876. The
1.3 This standard does not purport to address all of the
insoluble ash is used in calculating the combined tannin
safety concerns, if any, associated with its use. It is the because it is part of the tanned fiber structure that does not
responsibility of the user of this standard to establish appro-
leach from the leather during water extraction.
priate safety, health, and environmental practices and deter-
5. Apparatus
mine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accor- 5.1 Crucible, porcelain or platinum, large enough to hold
dance with internationally recognized principles on standard- the leather specimen.
ization established in the Decision on Principles for the
5.2 Electric Muffle Furnace, with temperature controller
Development of International Standards, Guides and Recom-
and pyrometer, capable of maintaining a temperature of 600 6
mendations issued by the World Trade Organization Technical
25°C.
Barriers to Trade (TBT) Committee.
6. Test Specimen
2. Referenced Documents
6.1 The specimen shall consist of the 5-g leather sample
2.1 ASTM Standards: remaining after water extraction as directed in Test Method
D2617 Test Method for Total Ash in Leather D2876.Anydeviationfromthissamplesizeshouldbeincluded
D2876 Test Method for Water-Soluble Matter of Vegetable- with the analytical results.
Tanned Leather
7. Procedure
3. Summary of Test Method
7.1 Remove the specimen quantitatively from the extraction
tube, dry at room temperature, transfer to the crucible, place in
3.1 The specimen from which the water-soluble matter has
a cold muffle furnace, and ash at 600 6 25°C until the crucible
been removed is heated at 600 6 25°C until carbon is removed
and contents have reached constant weight as directed in Test
Method D2617. Remove the crucible to a desiccator, cool, and
weigh.
This test method is under the jurisdiction ofASTM Committee D31 on Leather
and is the direct responsibility
...