This standard specifies the determination method for dichloromethane extract in leather, which is applicable to various types of leather. Fat and fatty substances cannot be completely extracted from leather using organic solvents. They may partially dissolve in leather and partially bond with leather. On the other hand, solvents can dissolve non fatty substances such as sulfur and fillers. These two substances can cause difficulties in determining the acid value and saponification value of fats. Note: The instruments and operations specified in this method are also applicable to the extraction of leather using solvents other than dichloromethane. If other solvents are used for other reasons, the solvent used should be indicated in the test report. This standard is equivalent to the international standard ISO 4048-1977 "Determination of the content of dichloromethane in leather". Define extractable substances: fats and other soluble substances that can be extracted from leather using dichloromethane. The principle is to continuously extract the prepared leather sample with dichloromethane. Evaporate the solvent in the extract. Dry the extract at 102 ± 2 ℃ and weigh it

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