NF EN ISO 4098

<p>ISO 4098 | IULTCS/IUC 6:2018 specifies a method of determination of water-soluble matter, water-soluble inorganic matter and water-soluble organic matter.</p> <p>ISO 4098 | IULTCS/IUC 6:2018 is applicable to all leather types. The result obtained by this analysis depends on factors such as:</p> <p>- the degree to which the leather is ground;</p> <p>- the extraction temperature;</p> <p>- the extraction period;</p> <p>- the ratio of leather to water.</p> <p>To obtain comparable results, it is consequently imperative that test conditions be accurately reproduced.</p> <p>In all cases, any ammonium salts in the filtrate are included as part of the water-soluble matter and are then decomposed on ignition. Thus they contribute towards the result for water-soluble organic substances. The concentration of the ammonium salts can be determined in the filtrate separately if required.</p>