ASTM D4900-99(2016) - 1.9.2016
 
Significance and Use

4.1 This test method is useful to detect possible adulteration of tanning material extract with cheap and inferior lignosulfonates.

 
1. Scope

1.1 This test method is intended for use in detecting the presence of lignosulfonates (sulfite cellulose) in extracts of 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

Lignosulfonates (Sulfite Cellulose) 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.

D4901-99(2026)

Standard Practice for Preparation of Solution of Liquid Vegetable Tannin Extracts

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

D6404-99(2020)

Standard Practice for Sampling Vegetable Materials Containing Tannin