ASTM D4904-99(2016) PDF

Scope: 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 D4901, D4905, or D6405. 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 and health practices and determine the applicability of regulatory limitations prior to use.

ASTM D4904-99(2016) Referenced Document

ASTM D4901 Standard Practice for Preparation of Solution of Liquid Vegetable Tannin Extracts*， 2020-12-01 Update
ASTM D4905 Standard Practice for Preparation of Solution of Solid, Pasty and Powdered Vegetable Tannin Extracts*， 2020-12-01 Update
ASTM D6405 Standard Practice for Extraction of Tannins from Raw and Spent Materials*， 2020-12-01 Update

2020 ASTM D4904-99(2020) Standard Practice for Cooling of Analytical Solutions
1999 ASTM D4904-99(2016) Standard Practice for Cooling of Analytical Solutions
1999 ASTM D4904-99(2009) Standard Practice for Preparation of Solution of Liquid Vegetable Tannin Extracts
1999 ASTM D4904-99(2004) Standard Practice for Preparation of Solution of Liquid Vegetable Tannin Extracts
1999 ASTM D4904-99 Standard Practice for Cooling of Analytical Solutions