This document 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, for example sulfur and impregnants, both of which cause difficulty in the determination of the acid value and saponification value of the fat. This document 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).
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Sisällysluettelo
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Sampling and preparation of the samples
8 Procedure
8.1 General
8.2 Extraction using the Soxhlet apparatus
8.3 Extraction using a pressurized extraction system
8.4 Determination of free fatty acid content
9 Expression of results
9.1 Calculation of the matter extractable in dichloromethane
9.2 Calculation of the free fatty acid content
10 Test report
Annex A Comparison of five leather samples (informative)
Annex B Repeatability and reproducibility (informative)
ISO 2418:2017 Leather -- Chemical, physical and mechanical and fastness tests -- Sampling location
ISO 4044:2017 Leather -- Chemical tests -- Preparation of chemical test samples
ISO 4684:2005 Leather -- Chemical tests -- Determination of volatile matter
ISO 2418:2017 Leather -- Chemical, physical and mechanical and fastness tests -- Sampling location
ISO 4044:2017 Leather -- Chemical tests -- Preparation of chemical test samples
ISO 4684:2005 Leather -- Chemical tests -- Determination of volatile matter