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Significance and Use
5.1 This test method is used to determine one of the chemical properties of tannery liquors which are relevant for the vegetable tanning process and influence the astringency of vegetable tanning liquors. The astringency of liquors is dependent upon the solids and tannin content and the acidity. This test method provides a standard procedure for determining the total acidity for any sample of vegetable tanning liquor.
5.2 The specimens are aliquots from the analytical solution prepared from the sample of tannery liquor collected for this purpose.
5.3 The total acidity of the liquor sample is determined by one of two titrametric procedures described in this test method.
1.1 This test method covers determining the acidity of tannery liquors made up from vegetable tanning materials.
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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D4904 Practice for Cooling of Analytical Solutions
D6404 Practice for Sampling Vegetable Materials Containing Tannin
ICS Number Code 59.140.10 (Processes and auxiliary materials)
UNSPSC Code 31221603(Organic tanning extracts of vegetable origin)
|Link to Active (This link will always route to the current Active version of the standard.)|
ASTM D6410-99(2020), Standard Test Method for Determining Acidity of Vegetable Tanning Liquors, ASTM International, West Conshohocken, PA, 2020, www.astm.orgBack to Top