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Significance and Use
Vegetable tanning materials are natural products containing various substances of varying composition, concentration and quality.
The methods referenced are useful for analyzing and testing vegetable tanning materials for moisture, water-extractable substances, cold-soluble fractions, tannins, non-tannins, acidity, tanning properties, the color of tanned leather, and the presence or absence of certain admixtures.
1.1 This practice is intended for use in the chemical analysis of all 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 and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D4900 Test Method for Lignosulfonates (Sulfite Cellulose) in Tanning Extracts
D4901 Practice for Preparation of Solution of Liquid Vegetable Tannin Extracts
D4902 Test Method for Evaporation and Drying of Analytical Solutions
D4903 Test Method for Total Solids and Water in Vegetable Tanning Material Extracts
D4904 Practice for Cooling of Analytical Solutions
D4905 Practice for Preparation of Solution of Solid, Pasty and Powdered Vegetable Tannin Extracts
D6401 Test Method for Determining Non-Tannins and Tannin in Extracts of Vegetable Tanning Materials
D6402 Test Method for Determining Soluble Solids and Insolubles in Extracts of Vegetable Tanning Materials
D6403 Test Method for Determining Moisture in Raw and Spent Materials
D6404 Practice for Sampling Vegetable Materials Containing Tannin
D6405 Practice for Extraction of Tannins from Raw and Spent Materials
D6406 Test Method for Analysis of Sugar in Vegetable Tanning Materials
D6407 Test Method for Analysis of Iron and Copper in Vegetable Tanning Materials
D6408 Test Method for Analysis of Tannery Liquors
D6409 Practice for Color Tests with Sheepskin Skiver
D6410 Test Method for Determining Acidity of Vegetable Tanning Liquors
UNSPSC Code 31221603(Organic tanning extracts of vegetable origin)