ASTM D4904-99(2004)

ASTM D4904-99(2004) - 1.4.2004

Significance and Use

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. Scope

1.1 This practice covers the preparation of a solution of liquid extract that is to be used in the tannin analysis of that extract.

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

D4905-99(2026)	Standard Practice for Preparation of Solution of Solid, Pasty and Powdered Vegetable Tannin Extracts
D6405-99(2020)	Standard Practice for Extraction of Tannins from Raw and Spent Materials
D4901-99(2026)	Standard Practice for Preparation of Solution of Liquid Vegetable Tannin Extracts
	Cooling of Analytical Solutions Official Methods of the American Leather Chemists Association. Available from the American Leather Chemists Association, University of Cincinnati, P.O. Box 210014, Cincinnati, OH 452210014.