TS 4125 EN ISO 4047 Leather - Determination of Sulphated Total Ash and Sulphated Water - Insoluble Ash

In the TS 4125 EN ISO 4047 standard, which is a European standard and also published by the International Standards Organization (ISO), a test method is defined for the determination of total sulfate ash and water-insoluble sulfate ash in leather material.

In order to determine the total mineral content, for example, in the framework of a complete leather analysis, inorganic substances are determined by calculation or determined separately. The principle of this test method consists of carbonization of the leather followed by treatment with sulfuric acid and powdery mildew in an open crucible. This test method is applicable to all skin types. By the way, if the leather contains organo-metallic compounds such as silicon, the results can be misleading.

The amount of mineral substances in ash-treated leather may differ from the actual content due to the escape of certain salts through decomposition, reduction, or evaporation. The ash is treated with sulfuric acid, converting salts and oxides into sulfates, although some salts are converted back into oxides at the selected firing temperature. To determine the total mineral content, for example within the framework of a complete leather analysis, water-soluble and water-insoluble inorganic substances are determined either by calculation or individually. The ISO 4098 standard applies in this regard (ISO 4098 Leather - Chemical tests - Determination of water-soluble substances, water-soluble inorganic substances and water-soluble organic substances).

For the purposes of this standard,

• Total sulphated ash refers to the amount of residual material that does not volatilize from the sample when the sample is fired in the presence of sulfuric acid. This test is commonly used to determine the content of inorganic impurities in an organic substance.
• Water-soluble substance refers to substances that dissolve in water from the skin under certain conditions.
• Water-soluble inorganic substance refers to the sulfated ash of the water-soluble substance prepared in accordance with the standard.
• Water-soluble organic matter refers to the difference between total water-soluble matter and water-soluble inorganic matter.

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