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BS EN ISO 4048:2018

BS EN ISO 4048:2018

$102.76

Leather. Chemical tests. Determination of matter soluble in dichloromethane and free fatty acid content

Published By Publication Date Number of Pages
BSI 2018 18
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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).

PDF Catalog

PDF Pages PDF Title
2 National foreword
4 European foreword
6 Foreword
9 1 Scope
2 Normative references
3 Terms and definitions
10 4 Principle
5 Reagents
6 Apparatus
11 7 Sampling and preparation of the samples
8 Procedure
8.1 General
8.2 Extraction using the Soxhlet apparatus
12 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
13 9.2 Calculation of the free fatty acid content
10 Test report
14 Annex A (informative) Comparison of five leather samples
15 Annex B (informative) Repeatability and reproducibility
16 Bibliography

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BS EN ISO 4048:2018
$102.76