Norm

NEN-EN-ISO 4048:2008 en

Leer - Chemische beproevingen - Bepaling van in dichloormethaan oplosbare stoffen en vrije vetgehalte

34,42

Over deze norm

Status Definitief
Aantal pagina's 6
Gepubliceerd op 01-02-2008
Taal Engels
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).

Details

ICS-code 59.140.30
Nederlandse titel Leer - Chemische beproevingen - Bepaling van in dichloormethaan oplosbare stoffen en vrije vetgehalte
Engelse titel Leather - Chemical tests - Determination of matter soluble in dichloromethane and free fatty acid content
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