ISO 4048:2008 PDF

Scope: This International Standard specifies a method for the determination of the substances in leather which are soluble in dichloromethane. This method is applicable to all types of leather. Not all fatty and similar substances can be extracted from leather with organic solvents; they may be in part soluble and partly bound to the leather. On the other hand, the solvent can dissolve non-fatty substances, e.g. sulfur and impregnants, both of which cause difficulty in the determination of the acid value and saponification value of the fat. This International Standard includes two techniques for extraction of the fatty substances: 1) extraction using the Soxhlet apparatus; and 2) extraction using a pressurized extraction system. As the extraction is frequently done in conjunction with determination of the free fatty acid content of the leather, a suitable procedure for determination of the free fatty acids extracted by this method is included. The apparatus and technique described in this method are also suitable for the extraction by solvents other than dichloromethane (although the temperature conditions may need to be varied for high pressure extraction).

ISO 4048:2008 Referenced Document

ISO 2418 Leather — Chemical, physical, mechanical and fastness tests — Position and preparation of specimens for testing*， 2023-02-06 Update
ISO 4044 Leather — Chemical tests — Preparation of chemical test samples*， 2017-01-01 Update
ISO 4098 Leather — Chemical tests — Determination of water-soluble matter, water-soluble inorganic matter and water-soluble organic matter*， 2018-02-01 Update
ISO 4684 Leather — Chemical tests — Determination of volatile matter

2018 ISO 4048:2018 Leather - Chemical tests - Determination of matter soluble in dichloromethane and free fatty acid content
2008 ISO 4048:2008 Leather - Chemical tests - Determination of matter soluble in dichloromethane and free fatty acid content
1977 ISO 4048:1977 Leather; Determination of matter soluble in dichloromethane