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Significance and Use
4.1 The solubility of extracts is influenced by temperature. The analytical solutions prepared from tanning extracts are dissolved or diluted in hot water. It is necessary to exercise caution in cooling these solutions, and to do so in such a way as to avoid chilling, under-cooling, or uneven cooling of the solutions.
1.1 This practice covers a standard procedure for the cooling of analytical solutions such as those prepared in Practices , , or . The tannin analysis results for an analytical solution are to some extent dependent on the conditions of the cooling of that solution.
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.
D4901 Practice for Preparation of Solution of Liquid Vegetable Tannin Extracts
D4905 Practice for Preparation of Solution of Solid, Pasty and Powdered Vegetable Tannin Extracts
D6405 Practice for Extraction of Tannins from Raw and Spent Materials
ICS Number Code 71.040.20 (Laboratory ware and related apparatus)
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 D4904-99(2020), Standard Practice for Cooling of Analytical Solutions, ASTM International, West Conshohocken, PA, 2020, www.astm.orgBack to Top