TS EN ISO 4098 Leather - Chemical Tests - Determination of Water-Soluble Substance, Water-Soluble Inorganic Substance and Water-Soluble Organic Substance

In the TS EN ISO 4098 standard, which is a European standard and also published by the International Standards Organization (ISO), a test method for the determination of water-soluble substances, water-soluble inorganic substances and water-soluble organic substances is explained. This standard applies to all leather types. The results obtained with this test method depend on the following factors:

• Grinding degree of leather
• Extraction temperature
• Extraction time
• Ratio of skin to water

As a result, accurate reproduction of test conditions is imperative in order to obtain comparable results. In any case, any ammonium salt in the filtration residue is included as part of the water-soluble substance and then decomposes when ignited. In this way it contributes to the result for water-soluble organic substances. The concentration of ammonium salts can be determined separately in the filtrate if necessary.

For the purposes of this standard,

• The term water-soluble substance refers to water-soluble substance from the skin under the conditions described in this method.
• The expression water-soluble inorganic substance refers to the sulfated ash of the water-soluble substance prepared according to this method.
• The expression water-soluble organic matter expresses the difference between total water-soluble matter and water-soluble inorganic matter.

When performing this test, in principle, aqueous extraction of a prepared sample under specified conditions followed by water-soluble matter, evaporation and 102 degrees plus/measured by drying at minus 2 degrees. Sulphation and ashing of the residue at 700 degrees yields water-soluble inorganic matter. Water-soluble organic matter is obtained from the difference. As the reagent, sulfuric acid solution or distilled or deionized water is used.

Our organization, among the numerous test, measurement, analysis and evaluation studies it has given for businesses in various sectors, with its trained and expert staff and advanced technological equipment, within the scope of TS EN ISO 4098 standard, between chemical tests of leather, water-soluble substances, water-soluble inorganic substances and It also provides testing services for the determination of water-soluble organic matter.